Casa Systems (CASSQ) 10-Q9 Nov 222022 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2022	Nov. 03, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Trading Symbol	CASA
Entity Registrant Name	Casa Systems, Inc.
Entity Central Index Key	0001333835
Current Fiscal Year End Date	--12-31
Document Quarterly Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity File Number	001-38324
Entity Tax Identification Number	75-3108867
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	100 Old River Road
Entity Address, City or Town	Andover
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01810
City Area Code	978
Local Phone Number	688-6706
Entity Common Stock, Shares Outstanding		94,621,236
Title of 12(b) Security	Common Stock, $0.001 par value per share
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 193,494	$ 154,703
Accounts receivable, net of provision for doubtful accounts of $295 and $117 as of September 30, 2022 and December 31, 2021, respectively	49,040	85,774	[1]
Inventory	82,189	84,828
Prepaid expenses and other current assets	4,013	5,746
Prepaid income taxes	2,929	23,963
Total current assets	331,665	355,014
Property and equipment, net	20,266	23,508
Accounts receivable, net of current portion	57	115
Deferred tax assets	63	101
Goodwill	50,177	50,177
Intangible assets, net	27,265	31,144
Other assets	8,475	8,648
Total assets	437,968	468,707
Current liabilities:
Accounts payable	13,784	28,087
Accrued expenses and other current liabilities	41,753	41,382
Accrued income taxes	6,598	4,991
Deferred revenue	33,597	14,473	[2]
Current portion of long-term debt, net of unamortized debt issuance costs	1,933	1,924
Total current liabilities	97,665	90,857
Accrued income taxes, net of current portion	8,175	7,732
Deferred tax liabilities	2,812	5,293
Deferred revenue, net of current portion	5,799	7,012
Long-term debt, net of current portion and unamortized debt issuance costs	272,739	274,193
Other liabilities, net of current portion	8,214	1,701
Total liabilities	395,404	386,788
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000 shares authorized as of September 30, 2022 and December 31, 2021; no shares issued and outstanding as of September 30, 2022 and December 31, 2021
Common stock, $0.001 par value; 500,000 shares authorized; 98,212 and 87,815 shares issued as of September 30, 2022 and December 31, 2021, respectively; 94,615 and 84,422 shares outstanding as of September 30, 2022 and December 31, 2021, respectively	98	88
Treasury stock, at cost; 3,597 and 3,393 shares as of September 30, 2022 and December 31, 2021, respectively	(14,837)	(13,645)
Additional paid-in capital	240,579	193,654
Accumulated other comprehensive (loss) income	(3,805)	878
Accumulated deficit	(179,471)	(99,056)
Total stockholders’ equity	42,564	81,919
Total liabilities and stockholders’ equity	$ 437,968	$ 468,707

[1] Includes accounts receivable due from a related party of $ 1,817 at September 30, 2022 (see Note 15) Includes deferred revenue associated with a related party of $ 16,775 at September 30, 2022 (see Note 15)

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Provision for doubtful accounts	$ 295	$ 117
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	98,212,000	87,815,000
Common stock, shares outstanding	94,615,000	84,422,000
Treasury stock, shares	3,597,000	3,393,000
Accounts receivable due from related party	$ 1,817
Deferred revenue associated with related party	$ 16,775

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue:
Total revenue	[1]	$ 66,899	$ 99,219	$ 202,134	$ 296,226
Cost of revenue:
Total cost of revenue		52,523	58,595	134,444	154,047
Gross profit		14,376	40,624	67,690	142,179
Operating expenses:
Research and development		22,059	21,578	67,545	63,479
Selling, general and administrative		22,442	21,029	66,741	64,492
Total operating expenses		44,501	42,607	134,286	127,971
(Loss) income from operations		(30,125)	(1,983)	(66,596)	14,208
Other income (expense):
Interest income		810	80	1,118	297
Interest expense		(4,762)	(3,969)	(12,270)	(11,886)
Gain (loss) on foreign currency, net		1,546	(375)	2,089	(1,353)
Other income, net		106	83	285	634
Total other expense, net		(2,300)	(4,181)	(8,778)	(12,308)
(Loss) income before (benefit from) provision for income taxes		(32,425)	(6,164)	(75,374)	1,900
(Benefit from) provision for income taxes		(1,261)	(5,288)	5,071	220
Net (loss) income		(31,164)	(876)	(80,445)	1,680
Other comprehensive (loss) income -foreign currency translation adjustment, net of tax		(2,737)	(127)	(4,683)	130
Comprehensive (loss) income		$ (33,901)	$ (1,003)	$ (85,128)	$ 1,810
Net (loss) income per share attributable to common stockholders:
Basic		$ (0.33)	$ (0.01)	$ (0.89)	$ 0.02
Diluted		$ (0.33)	$ (0.01)	$ (0.89)	$ 0.02
Weighted-average shares used to compute net (loss) income per share attributable to common stockholders:
Basic		94,512	85,660	90,569	84,985
Diluted		94,512	85,660	90,569	88,948
Product
Revenue:
Total revenue		$ 55,435	$ 87,752	$ 167,121	$ 262,019
Cost of revenue:
Total cost of revenue		38,421	57,372	117,531	150,515
Service
Revenue:
Total revenue		11,464	11,467	35,013	34,207
Cost of revenue:
Total cost of revenue		1,195	$ 1,223	4,006	$ 3,532
Warranty Settlement Provision
Cost of revenue:
Total cost of revenue		$ 12,907		$ 12,907

[1] Includes revenue during which a related party relationship existed of $ 3,041 and $ 13,591 during the three and nine months ended September 30, 2022 (see Note 15)

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Income Statement [Abstract]
Revenue from related party	$ 3,041	$ 13,591

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balances at Dec. 31, 2020	$ 76,374	$ 85		$ 183,041	$ 337	$ (102,263)
Balances, shares at Dec. 31, 2020		85,329
Balance Treasury, shares at Dec. 31, 2020			1,722
Balance Treasury at Dec. 31, 2020			$ (4,826)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes	(2,784)	$ 3		(2,787)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes, shares		2,349
Foreign currency translation adjustment	130				130
Stock-based compensation	11,145			11,145
Net income (loss)	1,680					1,680
Balances at Sep. 30, 2021	86,545	$ 88		191,399	467	(100,583)
Balances, shares at Sep. 30, 2021		87,678
Balance Treasury, shares at Sep. 30, 2021			1,722
Balance Treasury at Sep. 30, 2021			$ (4,826)
Balances at Jun. 30, 2021	81,957	$ 87		185,809	594	(99,707)
Balances, shares at Jun. 30, 2021		87,116
Balance Treasury, shares at Jun. 30, 2021			1,722
Balance Treasury at Jun. 30, 2021			$ (4,826)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes	1,705	$ 1		1,704
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes, shares		562
Foreign currency translation adjustment	(127)				(127)
Stock-based compensation	3,886			3,886
Net income (loss)	(876)					(876)
Balances at Sep. 30, 2021	86,545	$ 88		191,399	467	(100,583)
Balances, shares at Sep. 30, 2021		87,678
Balance Treasury, shares at Sep. 30, 2021			1,722
Balance Treasury at Sep. 30, 2021			$ (4,826)
Balances at Dec. 31, 2021	$ 81,919	$ 88		193,654	878	(99,056)
Balances, shares at Dec. 31, 2021		87,815
Balance Treasury, shares at Dec. 31, 2021	3,393		3,393
Balance Treasury at Dec. 31, 2021	$ 13,645		$ (13,645)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes	(1,772)	$ 1		(1,773)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes, shares		1,074
Foreign currency translation adjustment	(4,653)				(4,683)	30
Repurchases of treasury shares	(1,192)		$ (1,192)
Repurchases of treasury shares, shares			204
Sale of common stock, net of issuance costs	39,370	$ 9		39,361
Sale of common stock, net of issuance costs, Shares		9,323
Stock-based compensation	9,337			9,337
Net income (loss)	(80,445)					(80,445)
Balances at Sep. 30, 2022	$ 42,564	$ 98		240,579	(3,805)	(179,471)
Balances, shares at Sep. 30, 2022		98,212
Balance Treasury, shares at Sep. 30, 2022	3,597		3,597
Balance Treasury at Sep. 30, 2022	$ 14,837		$ (14,837)
Balances at Jun. 30, 2022	73,162	$ 98		237,306	(1,068)	(148,337)
Balances, shares at Jun. 30, 2022		98,009
Balance Treasury, shares at Jun. 30, 2022			3,597
Balance Treasury at Jun. 30, 2022			$ (14,837)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes	(398)			(398)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes, shares		203
Foreign currency translation adjustment	(2,707)				(2,737)	30
Stock-based compensation	3,671			3,671
Net income (loss)	(31,164)					(31,164)
Balances at Sep. 30, 2022	$ 42,564	$ 98		$ 240,579	$ (3,805)	$ (179,471)
Balances, shares at Sep. 30, 2022		98,212
Balance Treasury, shares at Sep. 30, 2022	3,597		3,597
Balance Treasury at Sep. 30, 2022	$ 14,837		$ (14,837)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021
Operating activities:
Net income (loss)		$ (80,445)	$ 1,680
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation and amortization		10,336	11,986
Stock-based compensation		9,178	11,245
Deferred income taxes		(2,435)	(1,322)
Change in provision for doubtful accounts		178	63
Change in provision for excess and obsolete inventory		5,934	(98)
Gain on disposal of assets		7	29
Changes in operating assets and liabilities:
Accounts receivable		35,573	13,194
Inventory		(3,454)	9,302
Prepaid expenses and other assets		1,833	(1,648)
Prepaid income taxes		21,013	(5,873)
Accounts payable		(13,568)	(17,553)
Accrued expenses and other current liabilities		7,470	(6,074)
Accrued income taxes		2,053	(1,601)
Deferred revenue		17,990	1,867
Net cash provided by operating activities		11,663	15,197
Investing activities:
Purchases of property and equipment		(2,611)	(2,979)
Purchases of software licenses		(714)	(1,425)
Net cash used in investing activities		(3,325)	(4,404)
Financing activities:
Principal repayments of debt		(2,250)	(9,025)
Proceeds from exercise of stock options		304	3,532
Employee taxes paid related to net share settlement of equity awards		(2,074)	(6,315)
Proceeds from sale of common stock, net of issuance costs		39,370
Payments of dividends and equitable adjustments		(1)	(97)
Repurchases of common stock		(1,192)
Net cash provided by (used in) financing activities		34,157	(11,905)
Effect of exchange rate changes on cash and cash equivalents		(3,697)	111
Net increase in cash, cash equivalents and restricted cash		38,798	(1,001)
Cash, cash equivalents and restricted cash at beginning of period		157,804	158,461
Cash, cash equivalents and restricted cash at end of period	[1]	196,602	157,460
Supplemental disclosures of cash flow information:
Cash paid for interest		11,419	12,167
Cash paid for income taxes		7,845	8,288
Supplemental disclosures of non-cash operating, investing and financing activities:
Purchases of property and equipment included in accounts payable		$ 313	$ 179

[1] See Note 2 of the accompanying notes for a reconciliation of the ending balance of cash, cash equivalents and restricted cash shown in these unaudited condensed consolidated statements of cash flows.

Nature of Business and Basis of

Nature of Business and Basis of Presentation	9 Months Ended
Nature of Business and Basis of Presentation	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	1. Nature of Business and Basis of Presentation Casa Systems, Inc. (the “Company”) was incorporated under the laws of the State of Delaware on February 28, 2003. The Company is a global communications technology company headquartered in Andover, Massachusetts and has wholly owned subsidiaries in China, France, Canada, Ireland, Spain, the Netherlands, Hong Kong, Australia, Germany, the United Kingdom and New Zealand. The Company offers physical, virtual and cloud-native 5G infrastructure and customer premise networking equipment solutions to help CSPs transform and expand their public and private high-speed data and multi-service communications networks so they can meet the growing demand for bandwidth and new services. The Company’s core and edge broadband technology enables CSPs and enterprises to cost-effectively and dynamically increase data network speed, add bandwidth capacity and new services, reduce network complexity and reduce operating and capital expenditures regardless of access technology. The Company is subject to a number of risks similar to other companies of comparable size and other companies selling and providing services to the CSP industry. These risks include, but are not limited to, the level of capital spending by CSPs, a lengthy sales cycle, dependence on the development of new products and services, unfavorable economic and market conditions, competition from larger and more established companies, limited management resources, dependence on a limited number of contract manufacturers and suppliers, the rapidly changing nature of the technology used by CSPs and reliance on resellers and sales agents. Failure by the Company to anticipate or to respond adequately to technological developments in its industry, changes in customer or supplier requirements, changes in regulatory requirements or industry standards, or any significant delays in the development or introduction of products could have a material adverse effect on the Company’s operating results, financial condition and cash flows. Management believes the existing cash and cash equivalents and anticipated cash flows from future operations will be sufficient to meet its working capital and capital expenditure needs and debt service obligations for at least the next 12 months. As described in Note 9 "Debt", the Company's outstanding term loan facility is scheduled to mature in December 2023, and it has commenced the refinancing process. If the Company is unable to successfully complete a refinancing of a sufficient portion of the outstanding balance prior to maturity or otherwise satisfy its repayment obligations, there may be substantial doubt about its ability to continue as a going concern beyond the maturity date of the loan. The Company is an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”) and may remain an emerging growth company until the last day of the fiscal year following the fifth anniversary of the Company’s initial public offering, subject to specified conditions. The JOBS Act provides that an emerging growth company can take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. The Company has elected not to “opt out” of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company is required to adopt the new or revised standard at or prior to the time private companies are required to adopt the new or revised standard, provided that the Company continues to be an emerging growth company. The JOBS Act provides that the decision to take advantage of the extended transition period for complying with new or revised accounting standards is irrevocable. The Company will remain an emerging growth company until December 31, 2022. The accompanying condensed consolidated balance sheet as of September 30, 2022, the condensed consolidated statements of operations and comprehensive (loss) income for the three and nine months ended September 30, 2022 and 2021, the condensed consolidated statements of cash flows for the nine months ended September 30, 2022 and 2021 and the condensed consolidated statements of stockholders’ equity for the three and nine months ended September 30, 2022 and 2021 are unaudited. The financial data and other information disclosed in these notes related to the three and nine months ended September 30, 2022 and 2021 are also unaudited. The accompanying condensed consolidated balance sheet as of December 31, 2021 was derived from the Company’s audited consolidated financial statements for the year ended December 31, 2021 included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on February 25, 2022 (the “Annual Report on Form 10-K”). The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) regarding interim financial reporting. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Annual Report on Form 10-K. There have been no changes to the Company’s accounting policies from those disclosed in the Annual Report on Form 10-K that would have a material impact on the Company’s condensed consolidated financial statements. The unaudited interim condensed consolidated financial statements have been prepared on a basis consistent with that used to prepare the audited annual consolidated financial statements and, in the opinion of management, include all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods, but are not necessarily indicative of the results of operations and cash flows to be anticipated for the full year ending December 31, 2022 or any future period. The accompanying condensed consolidated financial statements include the accounts and results of operations of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and judgments relied upon by management in preparing these condensed consolidated financial statements include revenue recognition, reserves for excess and obsolete inventory, valuation of inventory and deferred inventory costs, the expensing and capitalization of software-related research and development costs, amortization and depreciation periods, the recoverability of net deferred tax assets, valuations of uncertain tax positions, warranty allowances, the valuation of equity instruments and stock-based compensation expense. Although the Company regularly reassesses the assumptions underlying these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances existing at the time such estimates are made. The COVID-19 pandemic presents various risks to the Company, which could continue to have a material effect upon the estimates and judgments relied upon by management in preparing these condensed consolidated financial statements. While the Company remains fully operational, during the three and nine months ended September 30, 2022, the effects of the COVID-19 pandemic on the global supply chain had a significant adverse effect on the Company’s financial results. In particular, certain of the Company’s products utilize components, whose availability was significantly exceeded by global demand. As a result, during the three and nine months ended September 30, 2022, the Company continued to see shortages of supply that resulted in the Company’s inability to fulfill certain customer orders within normal lead times. This adversely impacted the Company’s revenue and operating results for the three and nine months ended September 30, 2022. Additionally, shipping bottlenecks and delays negatively affected the Company’s ability to timely fulfill customer orders, thereby delaying its ability to consummate sales and recognize revenue. The Company also experienced, in some cases, significant increases in shipping costs. While the Company continues to work with its supply chain, contract manufacturers, logistics partners, and customers to minimize the extent of such impacts, the Company expects the effects of global supply chain issues to continue and cannot predict when such effects will subside. This may prevent the Company from being able to fulfill its customers’ orders in a timely manner or at all, which could lead to one or more of its customers cancelling their orders. In addition, the regions in which the Company operates have experienced a significant increase in inflation, which has adversely impacted the cost to manufacture the Company's products with limited ability to pass such increases on to its customers under previously established fixed price agreements. Inflation has further resulted in increased operating costs, and interest rate increases, which will result in increased debt service costs. If interest rates continue to rise the Company anticipates further adverse effects from inflation and increased interest rates. At this time the Company is neither able to estimate the extent of these impacts nor predict whether its efforts to minimize or contain them will be successful. The Company intends to continue to monitor its business very closely for any effects of COVID-19, inflation and interest rate increases for as long as necessary. Subsequent Event Considerations The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence for certain estimates or to identify matters that require additional disclosure. Subsequent events have been evaluated as required, and other than the debt repurchase discussed in Note 17, “Subsequent Events”, the Company has determined that there are no other material recognized or unrecognized subsequent events requiring disclosure in these condensed consolidated financial statements. Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents include all highly liquid investments maturing within three months from the date of purchase. As of September 30, 2022 and December 31, 2021, the Company’s cash and cash equivalents consisted of investments in money market mutual funds. Restricted cash as of September 30, 2022 and December 31, 2021 consisted of a certificate of deposit of $ 1,008 , pledged as collateral for a stand-by letter of credit required to support a contractual obligation. Restricted cash also included cash of $ 2,100 pledged as collateral in connection with five and two letters of credit to support contractual obligations at September 30, 2022 and December 31, 2021, respectively. The following table is a reconciliation of cash, cash equivalents and restricted cash included in the accompanying condensed consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying condensed consolidated statements of cash flows: September 30, 2022 September 30, 2021 Cash and cash equivalents $ 193,494 $ 156,460 Restricted cash included in other assets 3,108 1,000 $ 196,602 $ 157,460 Accounts Receivable Accounts receivable are presented net of a provision for doubtful accounts, which is an estimate of amounts that may not be collectible. Accounts receivable for customer contracts with customary payment terms, which are one year or less, are recorded at invoiced amounts and do not bear interest. The Company may, in limited circumstances, grant payment terms longer than one year. Payments due beyond 12 months from the balance sheet date are recorded as non-current assets. The Company generally does not require collateral, but the Company may, in certain instances based on its credit assessment, require full or partial prepayment prior to shipment. Accounts receivable as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Current portion of accounts receivable, net: Accounts receivable, net $ 49,021 $ 85,689 Accounts receivable, extended payment terms 19 85 49,040 85,774 Accounts receivable, net of current portion: Accounts receivable, extended payment terms 57 115 $ 49,097 $ 85,889 The Company performs ongoing credit evaluations of its customers and, if necessary, provides a provision for doubtful accounts and expected losses. When assessing and recording its provision for doubtful accounts, the Company evaluates the age of its accounts receivable, current economic trends, creditworthiness of the customer, customer payment history, and other specific customer and transaction information. The Company writes off accounts receivable against the provision when it determines a balance is uncollectible and no longer actively pursues collection of the receivable. Adjustments to the provision for doubtful accounts are recorded as selling, general and administrative expenses in the condensed consolidated statements of operations and comprehensive (loss) income. As of September 30, 2022 and December 31, 2021 , the Company concluded that all amounts due under extended payment terms were collectible and recorded no reserve for credit losses. During the nine months ended September 30, 2022 and 2021 , the Company did no t provide a reserve for credit losses and did no t write off any uncollectible receivables due under extended payment terms. Concentration of Risks Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. Cash and cash equivalents consist of demand deposits, savings accounts, money market mutual funds, and certificates of deposit with financial institutions, which may exceed Federal Deposit Insurance Corporation limits. The Company has not experienced any losses related to its cash and cash equivalents and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships. The Company grants credit to customers in the ordinary course of business. Credit evaluations are performed on an ongoing basis to reduce credit risk, and no collateral is required from the Company’s customers. An allowance for uncollectible accounts is provided for those accounts receivable considered to be uncollectible based upon historical experience and credit evaluation. Due to these factors, no additional losses beyond the amounts provided for collection losses is believed by management to be probable in the Company’s accounts receivable. Significant customers are those that represent 10% or more of revenue or accounts receivable and are set forth in the following tables: Revenue Revenue Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Customer A 17 % * 13 % * Customer B * 24 % * 20 % Customer C * * * 11 % Accounts Receivable, Net As of As of September 30, 2022 December 31, 2021 Customer B * 21 % Customer D * 19 % Customer E * 10 % * Less than 10% of total Certain of the components and subassemblies included in the Company’s products are obtained and manufactured from a single source or a limited group of suppliers. Although the Company seeks to reduce dependence on those single or limited source suppliers, the partial or complete loss of certain of these sources could have a material adverse effect on the Company’s operating results, financial condition and cash flows and damage its customer relationships. Inventories The Company values inventories at the lower of cost or net realizable value. The Company computes cost using the first-in first-out convention. Inventories are composed of hardware and related component parts of finished goods. The Company establishes provisions for excess and obsolete inventories after evaluating historical sales, future demand, market conditions, expected product life cycles, and current inventory levels to reduce such inventories to their estimated net realizable value. The Company makes such provisions in the normal course of business and charges them to cost of revenue in its consolidated statements of operations and comprehensive (loss) income. Impact of Recently Adopted Accounting Standards In October 2021, the Financial Accounting Standards Board, ("FASB"), issued Accounting Standards Codification Update (“ASU”) 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers , ("ASU 2021-08"). Under ASU 2021-08 , an acquirer must recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. Effective January 1, 2022 , the Company early adopted ASU 2021-08 on a prospective basis. The impact of adoption of this standard on the Company’s condensed consolidated financial statements was not material . Impact of Recently Issued Accounting Standards In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842): Amendments to FASB Accounting Standards Codification ("ASU 2016-02"), which replaces the existing guidance for leases. ASU 2016-02 requires the identification of arrangements that should be accounted for as leases by lessees. In general, for lease arrangements exceeding a twelve-month term, the arrangements must now be recognized as assets and liabilities on the balance sheet of the lessee. Under ASU 2016-02, a right-of-use asset and lease obligation will be recorded for all leases, whether operating or financing, while the income statement will reflect lease expense for operating leases and amortization/interest expense for financing leases. The balance sheet amount recorded for existing leases at the date of adoption of ASU 2016-02 must be calculated using the applicable incremental borrowing rate at the date of adoption. This guidance will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for annual reporting periods beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. The Company will begin reporting on topics required by ASU 2016-02 during the fourth quarter of 2022. The Company will use a modified retrospective approach with comparatives under ASC 840, where entities would recognize a cumulative effect to retained earnings at the date of adoption without restating prior period balances or disclosure. The Company is in the process of finalizing certain aspects of the adoption and anticipates such guidance will materially impact its balance sheet given the Company’s leasing commitments as of December 31, 2021, as disclosed in Note 8 included in the Annual Report on Form 10-K. The Company does not expect a material impact on its condensed consolidated statement of operations. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments , or ASU 2016-13. This guidance is intended to provide more decision-useful information about expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The main provisions include presenting financial assets measured at amortized cost at the amount expected to be collected, which is net of an allowance for expected credit losses and recording credit losses related to available-for-sale securities through an allowance for credit losses. The effective dates for the amendments in ASU 2016-13 were updated in ASU 2019-10, Financial Instruments – Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842) , and as such ASU 2016-13 will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for fiscal years beginning after December 15, 2022, including interim periods within those fiscal periods, and must be applied using a modified retrospective approach. The Company does not expect a material impact on its condensed consolidated financial statements. Other Other than the disclosures above, there have been no changes to the significant accounting policies disclosed in Note 2 “Summary of Significant Accounting Policies” to the Company’s consolidated financial statements included in its Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
Goodwill and Intangible Assets	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	3. Goodwill and Intangible Assets Intangible assets, net consisted of intangible assets resulting from the acquisition of NetComm and purchased software to be used in the Company’s products. Intangible assets, net consisted of the following at September 30, 2022 and December 31, 2021, respectively: Cost Accumulated Net Balance Developed Technology $ 25,000 $ ( 11,609 ) $ 13,391 Customer Relationships 18,000 ( 5,850 ) 12,150 Trade Name 1,000 ( 1,000 ) — Purchased software 2,545 ( 821 ) 1,724 Totals as of September 30, 2022 $ 46,545 $ ( 19,280 ) $ 27,265 Cost Accumulated Net Balance Developed Technology $ 25,000 $ ( 8,930 ) $ 16,070 Customer Relationships 18,000 ( 4,500 ) 13,500 Trade Name 1,000 ( 830 ) 170 Purchased software 1,832 ( 428 ) 1,404 Totals as of December 31, 2021 $ 45,832 $ ( 14,688 ) $ 31,144 As of September 30, 2022, amortization expense on existing intangible assets for the next five years and beyond is as follows: Year Ending December 31, Remainder of 2022 $ 1,506 2023 6,002 2024 5,899 2025 5,751 2026 3,607 Thereafter 4,500 $ 27,265 A summary of amortization expense recorded during the three and nine months ended September 30, 2022 and 2021 is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Product cost of revenue $ 893 $ 893 $ 2,679 $ 2,679 Research and development 149 105 393 290 Selling, general and administrative 450 533 1,520 1,599 Totals $ 1,492 $ 1,531 $ 4,592 $ 4,568 The Company’s goodwill is the result of its acquisition of NetComm on July 1, 2019 and represents the excess of purchase price over the estimated fair value of net assets acquired. There has been no change to the $ 50,177 carrying amount of goodwill since December 31, 2021.

Inventory

Inventory	9 Months Ended
Inventory	Sep. 30, 2022
Inventory Disclosure [Abstract]
Inventory	4. Inventory Inventory as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Raw materials $ 45,599 $ 53,934 Finished goods: Manufactured finished goods 33,548 29,597 Deferred inventory costs 3,042 1,297 $ 82,189 $ 84,828 The decrease in inventory is due to $ 5,934 of additional reserves recognized during the nine months ended September 30, 2022 against certain of the Company's products and components that management has designated to be discontinued and as a result were adjusted to their estimated net realizable values. This was partially offset by additional purchases of inventory during the year.

Property and Equipment

Property and Equipment	9 Months Ended
Property and Equipment	Sep. 30, 2022
Property, Plant and Equipment [Abstract]
Property and Equipment	5. Property and Equipment Property and equipment as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Computers and purchased software $ 25,183 $ 25,775 Leasehold improvements 4,225 4,198 Furniture and fixtures 2,678 2,672 Machinery and equipment 35,681 37,325 Land 3,091 3,091 Building 4,765 4,765 Building improvements 7,337 7,291 Trial systems at customers’ sites 2,768 3,848 85,728 88,965 Less: Accumulated depreciation and amortization ( 65,462 ) ( 65,457 ) $ 20,266 $ 23,508 During the nine months ended September 30, 2022 and 2021 , the Company transferred trial systems into inventory from property and equipment with values of $ 1,081 and $ 1,145 , respectively, net of transfers of trial systems to cost of revenue. In addition, the Company transferred $ 1,629 and $ 325 of equipment into inventory from property and equipment during the nine months ended September 30, 2022 and 2021, respectively. Depreciation and amortization expense on property and equipment totaled $ 1,704 and $ 2,258 for the three months ended September 30, 2022 and 2021 , respectively, and $ 5,744 and $ 7,418 for the nine months ended September 30, 2022 and 2021 , respectively.

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	9 Months Ended
Accrued Expenses and Other Current Liabilities	Sep. 30, 2022
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	6. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Current liabilities Accrued compensation and related taxes $ 15,759 $ 21,751 Accrued warranty 3,367 2,392 Inventory-related accruals 5,357 8,391 Warranty Settlement Provision (see Note 16) 6,453 — Other accrued expenses 10,817 8,848 Accrued expenses and other current liabilities $ 41,753 $ 41,382 Non-current liabilities Warranty Settlement Provision, net of current portion (see Note 16) $ 6,454 $ — Other accrued expenses, net of current portion 1,760 1,701 Other liabilities, net of current portion $ 8,214 $ 1,701 Warranty Settlement Provision As discussed in further detail in Note 16, "Commitments and Contingencies", the Company previously received written notification from a significant customer of one of its international subsidiaries, of alleged costs incurred and expected to be incurred by that customer with respect to an ongoing warranty matter relating to field replacements of failed units for one particular product, which failure was attributable to an unauthorized part substitution in 2019 by a supplier to the subsidiary. As of September 30, 2022 , the Company recorded a warranty settlement provision for the estimated expected loss in the amount of 20,000 Australian dollars, or $ 12,907 USD, based on the exchange rate of USD $ 0.645 per AUD $1.00 on September 30, 2022, based on the status of ongoing negotiations. If our settlement offer were to be accepted, consideration is expected to be paid in future annual installments over 5 years . Accrued Warranty Substantially all of the Company’s products are covered by warranties for software and hardware for periods ranging from 90 days to one year . In addition, in conjunction with customers’ renewals of maintenance and support contracts, the Company offers an extended warranty for periods typically of one to three years for agreed-upon fees. In the event of a failure of a hardware product or software covered by these warranties, the Company must repair or replace the software or hardware or, if those remedies are insufficient, and at the discretion of the Company, provide a refund. The Company’s warranty reserve, which is included in accrued expenses and other current liabilities in the condensed consolidated balance sheets, reflects estimated material, labor and other costs related to potential or actual software and hardware warranty claims for which the Company expects to incur an obligation. The Company’s estimates of anticipated rates of warranty claims and the costs associated therewith are primarily based on historical information and future forecasts. The Company periodically assesses the adequacy of the warranty reserve and adjusts the amount as necessary. If the historical data used to calculate the adequacy of the warranty reserve are not indicative of future requirements, additional or reduced warranty reserves may be required. The following table presents a summary of changes in the amount reserved for warranty costs for the nine months ended September 30, 2022 and 2021: Nine Months Ended September 30, 2022 2021 Warranty reserve at beginning of period $ 2,392 $ 2,354 Provisions 2,371 2,015 Charges ( 1,396 ) ( 1,886 ) Warranty reserve at end of period $ 3,367 $ 2,483

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	7. Fair Value Measurements The following tables present information about the fair value of the Company’s financial assets and liabilities as of September 30, 2022 and December 31, 2021 and indicate the level of the fair value hierarchy utilized to determine such fair values: Fair Value Measurements as of September 30, 2022 Using: Level 1 Level 2 Level 3 Total Assets: Certificates of deposit—restricted cash $ — $ 3,108 $ — $ 3,108 Money market mutual funds 165,205 — — 165,205 $ 165,205 $ 3,108 $ — $ 168,313 Fair Value Measurements as of December 31, 2021 Using: Level 1 Level 2 Level 3 Total Assets: Certificates of deposit—restricted cash $ — $ 1,001 $ — $ 1,001 Money market mutual funds 93,792 — — 93,792 Foreign currency forward contract $ — 5 — 5 $ 93,792 $ 1,006 $ — $ 94,798 Liabilities: SARs $ — $ — $ 358 $ 358 $ — $ — $ 358 $ 358 During the nine months ended September 30, 2022 and 2021 , there were no transfers between Level 1, Level 2 and Level 3. There were no changes to the valuation techniques used to measure asset and liability fair values on a recurring basis during the nine months ended September 30, 2022 from those included in the Company’s consolidated financial statements for the year ended December 31, 2021 . The following table provides a summary of changes in the fair values of the Company’s SARs liability, for which fair value is determined by Level 3 inputs: Nine Months Ended September 30, 2022 2021 Fair value at beginning of period $ 358 $ 493 Change in fair value ( 159 ) 100 Exercises ( 199 ) ( 135 ) Fair value at end of period $ — $ 458

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes The Company’s effective income tax rate was 3.9 % and 85.8 % for the three months ended September 30, 2022 and 2021 , respectively. The benefit from income taxes was $ 1,261 and $ 5,288 for the three months ended September 30, 2022 and 2021 , respectively. The change in the benefit from income taxes was primarily due to a discrete benefit of $( 7,097 ) recorded in the three months ended September 30, 2021 related to finalization of loss carrybacks associated with the CARES Act. The change in the benefit from income taxes was also impacted by changes in the jurisdictional mix of earnings. The Company's effective income tax rate was ( 6.7 %) and 11.6 % for the nine months ended September 30, 2022 and 2021 , respectively. The provision for income taxes was $ 5,071 and $ 220 for the nine months ended September 30, 2022 and 2021 , respectively. The change in the provision from income taxes was impacted by a discrete benefit of $( 7,097 ) recorded in the nine months ended September 30, 2021 related to loss carrybacks associated with the CARES Act. The change in the provision for income taxes was also impacted by the new requirement to capitalize and amortize all research and experimentation expenditures for U.S. tax purposes, pursuant to the Tax Cuts and Jobs Act (“TCJA”) as of January 1, 2022. This new requirement results in significant forecasted U.S. current income tax for 2022 and the corresponding deferred tax asset created is offset by a full valuation allowance. The change in the provision for income taxes was also impacted by changes in the jurisdictional mix of earnings and the valuation allowance maintained against our deferred tax assets. The (benefit from) provision for income taxes for the three and nine months ended September 30, 2022 and 2021 differed from the federal statutory rate primarily due to the geographical mix of earnings and related foreign tax rate differential, permanent differences, research and development credits, foreign tax credits, the valuation allowance maintained against the Company's deferred tax assets and withholding taxes.

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2022
Debt Disclosure [Abstract]
Debt	9. Debt Term Loan and Revolving Credit Facilities On December 20, 2016, the Company entered into a credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, various lenders and JPMorgan Chase Bank, N.A. and Barclays Bank PLC providing for (i) a term loan facility of $ 300,000 (the “Term Loan”) and (ii) a revolving credit facility of up to $ 25,000 in revolving credit loans and letters of credit, which matured on December 20, 2021. Current and non-current debt obligations reflected in the condensed consolidated balance sheets as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, 2022 2021 Current liabilities: Term loan $ 3,000 $ 3,000 Current portion of principal payment obligations 3,000 3,000 Unamortized debt issuance costs, current portion ( 1,067 ) ( 1,076 ) Current portion of long-term debt, net of $ 1,933 $ 1,924 Non-current liabilities: Term loan $ 272,975 $ 275,225 Unamortized debt issuance costs, non-current portion ( 236 ) ( 1,032 ) Long-term debt, net of current portion and $ 272,739 $ 274,193 As of September 30, 2022, aggregate minimum future principal payments of the Company’s debt are summarized as follows: Year Ending December 31, Remainder of 2022 $ 750 2023 275,225 Thereafter — $ 275,975 As of September 30, 2022 and December 31, 2021, $ 275,975 and $ 278,225 in principal amount, respectively, were outstanding under the Term Loan. Borrowings under the Term Loan bear interest at a floating rate, which can be either a Eurodollar rate plus an applicable margin or, at the Company’s option, a base rate (defined as the highest of (x) the JPMorgan Chase, N.A. prime rate, (y) the federal funds effective rate, plus one-half percent ( 0.50 %) per annum and (z) a one-month Eurodollar rate plus 1.00 % per annum) plus an applicable margin. The applicable margin for borrowings under the Term Loan is 4.00 % per annum for Eurodollar rate loans (subject to a 1.00 % per annum interest rate floor) and 3.00 % per annum for base rate loans. The interest rate payable under the Term Loan is subject to an increase of 2.00 % per annum during the continuance of any payment default. For Eurodollar rate loans, the Company may select interest periods of one, three or six months or, with the consent of all relevant affected lenders, twelve months. Interest will be payable at the end of the selected interest period, but no less frequently than every three months within the selected interest period. Interest on any base rate loan is not set for any specified period and is payable quarterly. The Company has the right to convert Eurodollar rate loans into base rate loans and the right to convert base rate loans into Eurodollar rate loans at its option, subject, in the case of Eurodollar rate loans, to breakage costs if the conversion is effected prior to the end of the applicable interest period. As of September 30, 2022 , the interest rate on the Term Loan was 7.12 % per annum, which was based on a one-month Eurodollar rate of 3.12 % per annum plus the applicable margin of 4.00 % per annum for Eurodollar rate loans. As of December 31, 2021 , the interest rate on the Term Loan was 5.00 % per annum, which was based on a one-month Eurodollar rate, at the applicable floor of 1.00 % per annum plus the applicable margin of 4.00 % per annum for Eurodollar rate loans. Upon entering into the Term Loan, the Company incurred debt issuance costs of $ 7,811 , which were initially recorded as a reduction of the debt liability and are amortized to interest expense using the effective interest method from the issuance date of the Term Loan until the maturity date. Under the Term Loan, the Company made principal payments of $ 750 during each of the three months ended September 30, 2022 and 2021 , and made principal payments of $ 2,250 and $ 9,025 during the nine months ended September 30, 2022 and 2021 , respectively. Interest expense for the Term Loan, including the amortization of debt issuance costs, totaled $ 4,696 and $ 3,870 for the three months ended September 30, 2022 and 2021 , respectively, and totaled $ 12,270 and $ 11,672 for the nine months ended September 30, 2022 and 2021, respectively. The Term Loan matures on December 20, 2023 and is subject to amortization in equal quarterly installments, which commenced on March 31, 2017, of principal in an annual aggregate amount equal to 1.0 % of the original principal amount of the Term Loan of $ 300,000 , with the remaining outstanding balance payable at the date of maturity. As the maturity date approaches, the Company has begun the refinancing process. However, if we are unable to successfully complete a refinancing of a sufficient portion of the outstanding balance prior to maturity or otherwise satisfy our repayment obligations, there may be substantial doubt about our ability to continue as a going concern beyond the maturity date of the loan. Voluntary prepayments of principal amounts outstanding under the Term Loan are permitted at any time; however, if a prepayment of principal is made with respect to a Eurodollar loan on a date other than the last day of the applicable interest period, the Company is required to compensate the lenders for any funding losses and expenses incurred as a result of the prepayment. In addition, the Company is required to make mandatory prepayments under the Term Loan with respect to (i) 100 % of the net cash proceeds from certain asset dispositions (including casualty and condemnation events) by the Company or certain of its subsidiaries, subject to certain exceptions and reinvestment provisions, (ii) 100 % of the net cash proceeds from the issuance or incurrence of any additional debt by the Company or certain of its subsidiaries, subject to certain exceptions, and (iii) 50 % of the Company’s excess cash flow, as defined in the credit agreement, subject to reduction upon its achievement of specified performance targets. In accordance with these provisions, a mandatory early prepayment of $ 6,775 was paid by the Company during the nine months ended September 30, 2021 . The Term Loan is secured by, among other things, a first priority security interest, subject to permitted liens, in substantially all of the Company’s assets and all of the assets of certain of its subsidiaries and a pledge of certain of the stock of certain of its subsidiaries, in each case subject to specified exceptions. The Term Loan contains customary affirmative and negative covenants, including certain restrictions which are currently in effect based upon the Company’s total net leverage ratio, such as the Company’s ability to pay dividends and repurchase outstanding shares. The Company was in compliance with all covenants as of September 30, 2022 and December 31, 2021 .

Stockholders' Equity

Stockholders' Equity	9 Months Ended
Stockholders' Equity	Sep. 30, 2022
Equity [Abstract]
Stockholders' Equity	10. Stockholders’ Equity Stock Repurchase Program On February 21, 2019, the Company announced a stock repurchase program authorizing it to repurchase up to $ 75,000 of the Company’s common stock. The Company repurchased 204 shares, at a cost of $ 1,192 , including commissions, during the nine months ended September 30, 2022 . There were no repurchases made during the three months ended September 30, 2022 or during the three and nine months ended September 30, 2021. As of September 30, 2022 , $ 60,234 remained authorized for repurchases of the Company’s common stock under the stock repurchase program. However, b ased on the Company's net leverage ratio at September 30, 2022, as described in Note 9, "Debt", the Company's ability to repurchase shares is currently restricted. The stock repurchase program has no expiration date and does not require the Company to purchase a minimum number of shares, and the Company may suspend, modify or discontinue the stock repurchase program at any time without prior notice. Securities Purchase Agreement with Verizon Ventures LLC On April 18, 2022, the Company entered into a Securities Purchase Agreement (the “SPA”) with Verizon Ventures LLC providing for the private placement of an aggregate of 9,323 shares (the “Shares”) of the Company’s common stock, par value $ 0.001 per share, at a price of $ 4.24 per share, for an aggregate purchase price of approximately $ 39,530 . The Company filed a resale registration statement for the Shares with the SEC on May 17, 2022.

Stock-based Compensation

Stock-based Compensation	9 Months Ended
Stock-based Compensation	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based Compensation	11. Stock-based Compensation 2017 Stock Incentive Plan The Company’s 2017 Stock Incentive Plan (the “2017 Plan”) provides for the Company to sell or issue common stock or restricted common stock, or to grant qualified incentive stock options, nonqualified stock options, SARs, performance-based restricted stock units (“PSUs”), RSUs or other stock-based awards to the Company’s employees, officers, directors, advisors and outside consultants. The total number of shares authorized for issuance under the 2017 Plan was 19,404 shares as of September 30, 2022 , of which 5,916 shares remained available for future grant. Stock Options A summary of stock option activity for the nine months ended September 30, 2022 is as follows: Number Weighted- Weighted- Aggregate (in years) Outstanding at January 1, 2022 5,919 $ 8.82 4.36 $ 4,205 Granted 1,578 3.87 Exercised ( 156 ) 1.95 Forfeited ( 684 ) 11.03 Outstanding at September 30, 2022 6,657 $ 7.58 4.86 $ 260 Options exercisable at September 30, 2022 4,997 $ 8.75 3.35 $ 256 Vested or expected to vest at September 30, 2022 6,563 $ 7.63 4.79 $ 260 The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model using the following assumptions: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Risk-free interest rate 3.7 % 1.0 % 1.7 %– 3.7 % 1.0 % Expected term (in years) 6.1 6.1 5.6 – 6.3 6.1 Expected volatility 41.5 % 38.6 % 38.5 %– 41.5 % 38.2 %- 38.6 % Expected dividend yield 0.0 % 0.0 % 0.0 % 0.0 % The weighted-average grant-date fair value of options granted during the nine months ended September 30, 2022 and 2021 was $ 1.62 and $ 3.15 per share, respectively. Cash proceeds received upon the exercise of options were $ 304 and $ 3,532 during the nine months ended September 30, 2022 and 2021, respectively. The intrinsic value of stock options exercised during the nine months ended September 30, 2022 and 2021 was $ 342 and $ 5,182 , respectively. The aggregate intrinsic value is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common stock for those stock options that had exercise prices lower than the fair value of the Company’s common stock. Restricted Stock Units A summary of RSU activity for the nine months ended September 30, 2022 is as follows: Number of Weighted- Aggregate Unvested balance at January 1, 2022 4,309 $ 6.34 Granted 3,027 3.61 Vested ( 1,376 ) 6.89 $ 6,227 Forfeited ( 392 ) 6.30 Unvested balance at September 30, 2022 5,568 $ 4.72 The Company withheld 456 and 779 shares of common stock in settlement of employee tax withholding obligations due upon the vesting of RSUs and PSUs during the nine months ended September 30, 2022 and 2021, respectively. Performance-Based Stock Units During the nine months ended September 30, 2022 and 2021 , the Company granted PSUs to certain employees that vest over a three-year period based on the achievement of performance goals and continued performance of services. The performance goals for all PSUs granted during the nine months ended September 30, 2021 and a portion of PSUs granted during the nine months ended September 30, 2022 consist solely of market-based vesting conditions, determined by the Company’s level of achievement of pre-established parameters relating to the performance of the Company’s stock price as set by the Board of Directors. Vesting for these market-based PSUs may occur at any time during the three-year period. The remainder of PSUs granted during the nine months ended September 30, 2022 consist of performance-based vesting conditions determined by the Company's achievement of performance targets with respect to a certain customer agreement. Vesting for these performance-based PSUs may occur in varying percentages on January 1, 2023 , 2024 , and 2025 . A summary of PSU activity for the nine months ended September 30, 2022 is as follows: Number of Weighted- Aggregate Unvested balance at January 1, 2022 442 $ 7.89 Granted 846 2.79 Vested — — $ — Forfeited ( 26 ) 7.89 Unvested balance at September 30, 2022 1,262 $ 4.47 Compensation expense is based on the estimated value of the awards on the grant date, and is recognized over the period from the grant date through the expected vest dates of each vesting condition, both of which were estimated based on a Monte Carlo simulation model applying the following key assumptions: Nine months ended September 30, 2022 2021 Risk-free interest rate 2.8 % 0.2 % Volatility 79.1 % 78.6 % Dividend yield 0.0 % 0.0 % Cost of equity 13.2 % 12.0 % No PSUs were granted during the three months ended September 30, 2022 and 2021. Stock Appreciation Rights Over time, the Company has granted SARs that allow the holder the right, upon exercise, to receive in cash the amount of the difference between the fair value of the Company’s common stock at the date of exercise and the price of the underlying common stock at the date of grant of each SAR. The SARs vested over a four-year period from the date of grant and expire ten years from the date of grant. A summary of SAR activity for the nine months ended September 30, 2022 is as follows: Number Weighted- Outstanding at January 1, 2022 200 $ 7.28 Granted — — Exercised ( 90 ) 1.69 Forfeited — — Outstanding at September 30, 2022 110 $ 11.86 The fair value of the SAR liability as of December 31, 2021 was $ 358 (see Note 7), and was included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheets. There was no SAR liability as of September 30, 2022 as the exercise price of all outstanding SARs exceeded the fair value of the Company's common stock as of September 30, 2022. Stock-Based Compensation Expense Stock-based compensation expense related to stock options, RSUs, SARs and PSUs for the three and nine months ended September 30, 2022 and 2021 was classified in the condensed consolidated statements of operations and comprehensive (loss) income as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Cost of revenue $ 31 $ 29 $ 92 $ 95 Research and development expenses 824 557 2,113 1,971 Selling, general and administrative expenses 2,816 3,112 6,973 9,179 Total stock-based compensation $ 3,671 $ 3,698 $ 9,178 $ 11,245 The Company recognized stock-based compensation expense for the three and nine months ended September 30, 2022 and 2021 in the condensed consolidated balance sheet as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Change in fair value of SAR Liability $ — $ ( 188 ) $ ( 159 ) $ 100 Recognized as additional paid-in capital 3,671 3,886 9,337 11,145 Total stock-based compensation $ 3,671 $ 3,698 $ 9,178 $ 11,245 As of September 30, 2022 , there was $ 24,928 of unrecognized compensation cost related to outstanding stock options, RSUs, SARs and PSUs, which is expected to be recognized over a weighted-average period of 2.45 years.

Net (Loss) Income per Share

Net (Loss) Income per Share	9 Months Ended
Net (Loss) Income per Share	Sep. 30, 2022
Earnings Per Share [Abstract]
Net (Loss) Income per Share	12. Net (Loss) Income per Share Basic and diluted net (loss) income per share attributable to common stockholders was calculated as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Numerator: Net (loss) income attributable to common $ ( 31,164 ) $ ( 876 ) $ ( 80,445 ) $ 1,680 Denominator: Weighted-average shares used to compute net 94,512 85,660 90,569 84,985 Dilutive effect of stock options — — — 1,765 Dilutive effect of restricted stock units — — — 2,198 Weighted-average shares used to compute net 94,512 85,660 90,569 88,948 Net (loss) income per share attributable to common Basic $ ( 0.33 ) $ ( 0.01 ) $ ( 0.89 ) $ 0.02 Diluted $ ( 0.33 ) $ ( 0.01 ) $ ( 0.89 ) $ 0.02 The following potential common shares were excluded from the computation of diluted net (loss) income per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Options to purchase common stock 6,657 6,040 6,657 3,459 Unvested restricted stock units 5,568 4,380 5,568 723 Unvested performance-based stock units 1,262 442 1,262 —

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
Revenue from Contracts with Customers	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	13. Revenue from Contracts with Customers Disaggregation of revenue The Company disaggregates its revenue by product and service in the condensed consolidated statements of operations and comprehensive (loss) income. Performance obligations related to product revenue are recognized at a point in time, while performance obligations related to service revenue are recognized over time. The Company also disaggregates its revenue based on geographic locations of its customers, as determined by the customer’s shipping address, summarized as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 North America: U.S. $ 16,988 $ 40,671 $ 53,220 $ 101,534 Canada 14,556 11,087 39,655 61,875 Total North America 31,544 51,758 92,875 163,409 Europe, Middle East and Africa: 10,936 6,547 22,102 19,478 Asia-Pacific: Australia 14,448 24,329 51,740 68,527 Other 5,467 8,832 21,058 24,526 Total Asia-Pacific 19,915 33,161 72,798 93,053 Latin America 4,504 7,753 14,359 20,286 Total revenue (1) $ 66,899 $ 99,219 $ 202,134 $ 296,226 (1) Other than the U.S., Canada and Australia, no individual countries represented 10 % or more of the Company’s total revenue for any of the periods presented. The Company also disaggregates its revenue based on product line summarized as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Product revenue: Wireless $ 19,891 $ 43,070 $ 68,047 $ 116,081 Fixed telco 14,971 20,187 42,625 51,209 Cable 20,573 24,495 56,449 94,729 Total product revenue 55,435 87,752 167,121 262,019 Service revenue: Wireless 1,478 1,141 4,363 3,416 Fixed telco 316 825 3,027 3,474 Cable 9,670 9,501 27,623 27,317 Total service revenue 11,464 11,467 35,013 34,207 Total revenue $ 66,899 $ 99,219 $ 202,134 $ 296,226 Contract Balances Contract liabilities consist of deferred revenue and include payments received in advance of performance under the contract. Such amounts are recognized as revenue when the Company satisfies its performance obligations, consistent with the above methodology. During the three and nine months ended September 30, 2022 , the Company recognized $ 3,139 and $ 11,630 , respectively, of revenue that was included in deferred revenue in the condensed consolidated balance sheet as of December 31, 2021. During the three and nine months ended September 30, 2021 , the Company recognized $ 1,726 and $ 13,706 , respectively, of revenue that was included in deferred revenue in the condensed consolidated balance sheet as of December 31, 2020. The Company receives payments from customers based upon contractual billing terms. Accounts receivable are recorded when the right to consideration becomes unconditional. Contract assets include amounts related to the Company’s contractual right to consideration for both completed and partially completed performance obligations that may not have been invoiced. As of September 30, 2022 and December 31, 2021 , the Company included contract assets of $ 2,594 and $ 95 , respectively, in accounts receivable, net in the condensed consolidated balance sheets. Transaction Price Allocated to the Remaining Performance Obligations As of September 30, 2022 , the aggregate remaining amount of revenue expected to be recognized related to unsatisfied or partially unsatisfied performance obligations was $ 39,396 , which consists of deferred revenue. The Company expects approximately 85 % of this amount to be recognized in the next twelve months with the remaining amount to be recognized over the next two to five years .

Segment Information

Segment Information	9 Months Ended
Segment Information	Sep. 30, 2022
Segment Reporting [Abstract]
Segment Information	14. Segment Information The Company operates as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is regularly evaluated by the Company’s chief operating decision maker, or decision-making group, in deciding how to allocate resources and assess performance. The Company has determined that its chief operating decision maker is its President and Chief Executive Officer. The Company’s chief operating decision maker reviews the Company’s financial information on a consolidated basis for purposes of allocating resources and assessing financial performance. Since the Company operates as one operating segment, all required financial segment information can be found in these condensed consolidated financial statements. The Company’s property and equipment, net by location was as follows: September 30, December 31, U.S. $ 15,095 $ 17,089 China 3,018 3,118 Australia 1,323 2,027 Other 830 1,274 Total property and equipment, net $ 20,266 $ 23,508

Related Parties

Related Parties	9 Months Ended
Related Parties	Sep. 30, 2022
Related Party Transactions [Abstract]
Related Parties	15. Related Parties Employment of Rongke Xie Rongke Xie, who serves as General Manager of Guangzhou Casa Communication Technology LTD (“Casa China”), a subsidiary of the Company, is the sister of Lucy Xie, the Company’s Senior Vice President of Operations and a member of the Company’s Board of Directors. Casa China paid Rongke Xie $ 181 and $ 187 in total compensation during the nine months ended September 30, 2022 and 2021, respectively, for her services as an employee. To date, the Company has granted to Rongke Xie 145 RSUs which vest over four-year periods. The grant-date fair value of the awards totaled $ 600 , which is recorded as stock-based compensation expense over the vesting period of the awards. During the three months ended September 30, 2022 and 2021 , the Company recognized selling, general and administrative expenses of $ 26 and $ 28 related to these awards, and during the nine months ended September 30, 2022 and 2021 , the Company recognized selling, general and administrative expenses of $ 87 and $ 78 related to these awards. Transactions Involving Verizon Communications Inc. and its Affiliates As a result of the Company's SPA with Verizon Ventures LLC on April 18, 2022 (see Note 10, "Stockholders Equity"), Verizon Communications Inc. and its subsidiaries ("Verizon and Affiliates") collectively became a principal stockholder of the Company through its ownership of common stock. Verizon and Affiliates are customers of the Company. During the three and nine months ended September 30, 2022 , the Company recognized revenue of $ 3,041 and $ 13,591 from transactions with Verizon and Affiliates, and amounts received in cash resulting from revenue transactions with Verizon and Affiliates during the nine months ended September 30, 2022 totaled $ 27,203 . As of September 30, 2022 , amounts due from Verizon and Affiliates totaled $ 1,817 and were included in accounts receivable, net in the condensed consolidated balance sheet. As of September 30, 2022 , revenue from transactions that did not meet the criteria for recognition totaling $ 16,775 with Verizon and Affiliates were included in deferred revenue in the condensed consolidated balance sheet.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	16. Commitments and Contingencies Indemnification The Company has, in the ordinary course of business, agreed to defend and indemnify certain customers against third-party claims asserting (i) infringement of certain intellectual property rights, which may include patents, copyrights, trademarks or trade secrets, and (ii) certain other harms caused by the acts or omissions of the Company. As permitted under Delaware law, the Company indemnifies its officers, directors and employees for certain events or occurrences that happen by reason of their relationship with or position held at the Company. As of September 30, 2022 , the Company accrued $ 230 as a minimum estimated liability related to an ongoing indemnification claim. As of December 31, 2021, the Company had not experienced any material losses related to these indemnification obligations. As of September 30, 2022 and December 31, 2021, no additional material claims were outstanding where a contingent loss was considered to be probable or reasonably estimable. The Company does not expect additional significant claims related to these indemnification obligations and, consequently, concluded that the fair value of any additional obligations is negligible. Litigation The complete response to this section regarding legal proceedings is incorporated by reference herein to Part II Item I in this 10-Q. Other As described in Note 6, "Accrued Expenses and Other Current Liabilities", the Company provides industry-standard product warranties to its customers, and is thus inherently subject to loss contingencies that include warranty claims which may arise in the ordinary course of business. On July 21, 2022, the Company received written notification from a significant customer of one of its international subsidiaries, of alleged costs incurred and expected to be incurred by that customer with respect to an ongoing warranty matter relating to field replacements of failed units for one particular product, which failure was attributable to an unauthorized part substitution in 2019 by a supplier to the subsidiary. Although the customer has not initiated any legal proceeding against the subsidiary or the Company to date, the customer has communicated its estimated costs for which it is seeking reimbursement. This communication was in the form of a suggested amicable settlement in the amount of approximately $ 31,000 for alleged costs incurred to date, plus approximately $ 25,000 for estimated future costs, which may be incurred over the next 5 years for a total cash settlement proposal of approximately $ 56,000 . In addition, the settlement proposal also includes various non-monetary concessions, some of which, if agreed to, could result in significant additional costs to the Company. Management has entered into negotiations with the customer while concurrently evaluating the settlement proposal relative to the subsidiary’s contractual warranty obligations to the customer, as well as all details of the proposed settlement, including evaluating the basis of estimated costs incurred and to be incurred and all other relevant matters regarding this settlement proposal, including contractual terms in place with this customer regarding rights, remedies, limitations of liability, and other potential mitigating factors. The Company is also evaluating contractual obligations, responsibilities, and liabilities of the subsidiary’s part supplier in this matter. Based on the ongoing settlement negotiations to date, as of September 30, 2022 , Management has concluded that the likelihood of an unfavorable outcome is probable, and thus the Company established a reserve for the estimated expected loss in the amount of 20,000 Australian dollars, or $ 12,907 USD based on the exchange rate of USD $ 0.645 per AUD $1.00 on September 30, 2022, based on the status of ongoing negotiations. If our settlement offer were to be accepted, consideration is expected to be paid in future annual installments over 5 years .

Subsequent Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2022
Subsequent Events [Abstract]
Subsequent Events	17. Subsequent Events Debt Repurchase On October 27, 2022, the Company's Board of Directors authorized the use of cash to repurchase up to $ 50,000 of the Term Loan. On November 2, 2022, the Company repurchased a portion of its outstanding Term Loan from certain of its debt holders. The aggregate payments totaled $ 39,041 , paid using funds included in cash and cash equivalents in the condensed consolidated balance sheets as of September 30, 2022. Based on the applicable fair value of debt repurchased, the amount of outstanding principal of the Term Loan that was retired was $ 41,703 . The Company is in ongoing active discussions with other debt holders about repurchasing additional portions of the Term Loan and the Company may enter into additional agreements to repurchase portions of the outstanding Term Loan, up to the level approved by the Company’s Board of Directors, if favorable repurchase terms and economics are available to the Company.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2022
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and judgments relied upon by management in preparing these condensed consolidated financial statements include revenue recognition, reserves for excess and obsolete inventory, valuation of inventory and deferred inventory costs, the expensing and capitalization of software-related research and development costs, amortization and depreciation periods, the recoverability of net deferred tax assets, valuations of uncertain tax positions, warranty allowances, the valuation of equity instruments and stock-based compensation expense. Although the Company regularly reassesses the assumptions underlying these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances existing at the time such estimates are made. The COVID-19 pandemic presents various risks to the Company, which could continue to have a material effect upon the estimates and judgments relied upon by management in preparing these condensed consolidated financial statements. While the Company remains fully operational, during the three and nine months ended September 30, 2022, the effects of the COVID-19 pandemic on the global supply chain had a significant adverse effect on the Company’s financial results. In particular, certain of the Company’s products utilize components, whose availability was significantly exceeded by global demand. As a result, during the three and nine months ended September 30, 2022, the Company continued to see shortages of supply that resulted in the Company’s inability to fulfill certain customer orders within normal lead times. This adversely impacted the Company’s revenue and operating results for the three and nine months ended September 30, 2022. Additionally, shipping bottlenecks and delays negatively affected the Company’s ability to timely fulfill customer orders, thereby delaying its ability to consummate sales and recognize revenue. The Company also experienced, in some cases, significant increases in shipping costs. While the Company continues to work with its supply chain, contract manufacturers, logistics partners, and customers to minimize the extent of such impacts, the Company expects the effects of global supply chain issues to continue and cannot predict when such effects will subside. This may prevent the Company from being able to fulfill its customers’ orders in a timely manner or at all, which could lead to one or more of its customers cancelling their orders. In addition, the regions in which the Company operates have experienced a significant increase in inflation, which has adversely impacted the cost to manufacture the Company's products with limited ability to pass such increases on to its customers under previously established fixed price agreements. Inflation has further resulted in increased operating costs, and interest rate increases, which will result in increased debt service costs. If interest rates continue to rise the Company anticipates further adverse effects from inflation and increased interest rates. At this time the Company is neither able to estimate the extent of these impacts nor predict whether its efforts to minimize or contain them will be successful. The Company intends to continue to monitor its business very closely for any effects of COVID-19, inflation and interest rate increases for as long as necessary.
Subsequent Event Considerations	Subsequent Event Considerations The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence for certain estimates or to identify matters that require additional disclosure. Subsequent events have been evaluated as required, and other than the debt repurchase discussed in Note 17, “Subsequent Events”, the Company has determined that there are no other material recognized or unrecognized subsequent events requiring disclosure in these condensed consolidated financial statements.
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents include all highly liquid investments maturing within three months from the date of purchase. As of September 30, 2022 and December 31, 2021, the Company’s cash and cash equivalents consisted of investments in money market mutual funds. Restricted cash as of September 30, 2022 and December 31, 2021 consisted of a certificate of deposit of $ 1,008 , pledged as collateral for a stand-by letter of credit required to support a contractual obligation. Restricted cash also included cash of $ 2,100 pledged as collateral in connection with five and two letters of credit to support contractual obligations at September 30, 2022 and December 31, 2021, respectively. The following table is a reconciliation of cash, cash equivalents and restricted cash included in the accompanying condensed consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying condensed consolidated statements of cash flows: September 30, 2022 September 30, 2021 Cash and cash equivalents $ 193,494 $ 156,460 Restricted cash included in other assets 3,108 1,000 $ 196,602 $ 157,460
Accounts Receivable	Accounts Receivable Accounts receivable are presented net of a provision for doubtful accounts, which is an estimate of amounts that may not be collectible. Accounts receivable for customer contracts with customary payment terms, which are one year or less, are recorded at invoiced amounts and do not bear interest. The Company may, in limited circumstances, grant payment terms longer than one year. Payments due beyond 12 months from the balance sheet date are recorded as non-current assets. The Company generally does not require collateral, but the Company may, in certain instances based on its credit assessment, require full or partial prepayment prior to shipment. Accounts receivable as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Current portion of accounts receivable, net: Accounts receivable, net $ 49,021 $ 85,689 Accounts receivable, extended payment terms 19 85 49,040 85,774 Accounts receivable, net of current portion: Accounts receivable, extended payment terms 57 115 $ 49,097 $ 85,889 The Company performs ongoing credit evaluations of its customers and, if necessary, provides a provision for doubtful accounts and expected losses. When assessing and recording its provision for doubtful accounts, the Company evaluates the age of its accounts receivable, current economic trends, creditworthiness of the customer, customer payment history, and other specific customer and transaction information. The Company writes off accounts receivable against the provision when it determines a balance is uncollectible and no longer actively pursues collection of the receivable. Adjustments to the provision for doubtful accounts are recorded as selling, general and administrative expenses in the condensed consolidated statements of operations and comprehensive (loss) income. As of September 30, 2022 and December 31, 2021 , the Company concluded that all amounts due under extended payment terms were collectible and recorded no reserve for credit losses. During the nine months ended September 30, 2022 and 2021 , the Company did no t provide a reserve for credit losses and did no t write off any uncollectible receivables due under extended payment terms.
Concentration of Risks	Concentration of Risks Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. Cash and cash equivalents consist of demand deposits, savings accounts, money market mutual funds, and certificates of deposit with financial institutions, which may exceed Federal Deposit Insurance Corporation limits. The Company has not experienced any losses related to its cash and cash equivalents and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships. The Company grants credit to customers in the ordinary course of business. Credit evaluations are performed on an ongoing basis to reduce credit risk, and no collateral is required from the Company’s customers. An allowance for uncollectible accounts is provided for those accounts receivable considered to be uncollectible based upon historical experience and credit evaluation. Due to these factors, no additional losses beyond the amounts provided for collection losses is believed by management to be probable in the Company’s accounts receivable. Significant customers are those that represent 10% or more of revenue or accounts receivable and are set forth in the following tables: Revenue Revenue Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Customer A 17 % * 13 % * Customer B * 24 % * 20 % Customer C * * * 11 % Accounts Receivable, Net As of As of September 30, 2022 December 31, 2021 Customer B * 21 % Customer D * 19 % Customer E * 10 % * Less than 10% of total Certain of the components and subassemblies included in the Company’s products are obtained and manufactured from a single source or a limited group of suppliers. Although the Company seeks to reduce dependence on those single or limited source suppliers, the partial or complete loss of certain of these sources could have a material adverse effect on the Company’s operating results, financial condition and cash flows and damage its customer relationships.
Inventories	Inventories The Company values inventories at the lower of cost or net realizable value. The Company computes cost using the first-in first-out convention. Inventories are composed of hardware and related component parts of finished goods. The Company establishes provisions for excess and obsolete inventories after evaluating historical sales, future demand, market conditions, expected product life cycles, and current inventory levels to reduce such inventories to their estimated net realizable value. The Company makes such provisions in the normal course of business and charges them to cost of revenue in its consolidated statements of operations and comprehensive (loss) income.
Impact of Recently Adopted and Issued Accounting Standards	Impact of Recently Adopted Accounting Standards In October 2021, the Financial Accounting Standards Board, ("FASB"), issued Accounting Standards Codification Update (“ASU”) 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers , ("ASU 2021-08"). Under ASU 2021-08 , an acquirer must recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. Effective January 1, 2022 , the Company early adopted ASU 2021-08 on a prospective basis. The impact of adoption of this standard on the Company’s condensed consolidated financial statements was not material . Impact of Recently Issued Accounting Standards In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842): Amendments to FASB Accounting Standards Codification ("ASU 2016-02"), which replaces the existing guidance for leases. ASU 2016-02 requires the identification of arrangements that should be accounted for as leases by lessees. In general, for lease arrangements exceeding a twelve-month term, the arrangements must now be recognized as assets and liabilities on the balance sheet of the lessee. Under ASU 2016-02, a right-of-use asset and lease obligation will be recorded for all leases, whether operating or financing, while the income statement will reflect lease expense for operating leases and amortization/interest expense for financing leases. The balance sheet amount recorded for existing leases at the date of adoption of ASU 2016-02 must be calculated using the applicable incremental borrowing rate at the date of adoption. This guidance will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for annual reporting periods beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. The Company will begin reporting on topics required by ASU 2016-02 during the fourth quarter of 2022. The Company will use a modified retrospective approach with comparatives under ASC 840, where entities would recognize a cumulative effect to retained earnings at the date of adoption without restating prior period balances or disclosure. The Company is in the process of finalizing certain aspects of the adoption and anticipates such guidance will materially impact its balance sheet given the Company’s leasing commitments as of December 31, 2021, as disclosed in Note 8 included in the Annual Report on Form 10-K. The Company does not expect a material impact on its condensed consolidated statement of operations. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments , or ASU 2016-13. This guidance is intended to provide more decision-useful information about expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The main provisions include presenting financial assets measured at amortized cost at the amount expected to be collected, which is net of an allowance for expected credit losses and recording credit losses related to available-for-sale securities through an allowance for credit losses. The effective dates for the amendments in ASU 2016-13 were updated in ASU 2019-10, Financial Instruments – Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842) , and as such ASU 2016-13 will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for fiscal years beginning after December 15, 2022, including interim periods within those fiscal periods, and must be applied using a modified retrospective approach. The Company does not expect a material impact on its condensed consolidated financial statements.
Other	Other Other than the disclosures above, there have been no changes to the significant accounting policies disclosed in Note 2 “Summary of Significant Accounting Policies” to the Company’s consolidated financial statements included in its Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
Summary of Significant Accounting Policies (Tables)	Sep. 30, 2022
Accounting Policies [Abstract]
Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash in Accompanying Condensed Consolidated Balance Sheets	The following table is a reconciliation of cash, cash equivalents and restricted cash included in the accompanying condensed consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying condensed consolidated statements of cash flows: September 30, 2022 September 30, 2021 Cash and cash equivalents $ 193,494 $ 156,460 Restricted cash included in other assets 3,108 1,000 $ 196,602 $ 157,460
Schedule of Accounts Receivable	Accounts receivable as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Current portion of accounts receivable, net: Accounts receivable, net $ 49,021 $ 85,689 Accounts receivable, extended payment terms 19 85 49,040 85,774 Accounts receivable, net of current portion: Accounts receivable, extended payment terms 57 115 $ 49,097 $ 85,889
Schedule of Significant Customers Represent 10% or More of Revenue or Accounts Receivable	Significant customers are those that represent 10% or more of revenue or accounts receivable and are set forth in the following tables: Revenue Revenue Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Customer A 17 % * 13 % * Customer B * 24 % * 20 % Customer C * * * 11 % Accounts Receivable, Net As of As of September 30, 2022 December 31, 2021 Customer B * 21 % Customer D * 19 % Customer E * 10 % * Less than 10% of total

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
Goodwill and Intangible Assets (Tables)	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets Net	Intangible assets, net consisted of intangible assets resulting from the acquisition of NetComm and purchased software to be used in the Company’s products. Intangible assets, net consisted of the following at September 30, 2022 and December 31, 2021, respectively: Cost Accumulated Net Balance Developed Technology $ 25,000 $ ( 11,609 ) $ 13,391 Customer Relationships 18,000 ( 5,850 ) 12,150 Trade Name 1,000 ( 1,000 ) — Purchased software 2,545 ( 821 ) 1,724 Totals as of September 30, 2022 $ 46,545 $ ( 19,280 ) $ 27,265 Cost Accumulated Net Balance Developed Technology $ 25,000 $ ( 8,930 ) $ 16,070 Customer Relationships 18,000 ( 4,500 ) 13,500 Trade Name 1,000 ( 830 ) 170 Purchased software 1,832 ( 428 ) 1,404 Totals as of December 31, 2021 $ 45,832 $ ( 14,688 ) $ 31,144
Schedule of Amortization Expense on Existing Intangible Assets	As of September 30, 2022, amortization expense on existing intangible assets for the next five years and beyond is as follows: Year Ending December 31, Remainder of 2022 $ 1,506 2023 6,002 2024 5,899 2025 5,751 2026 3,607 Thereafter 4,500 $ 27,265
Summary of Amortization Expense	A summary of amortization expense recorded during the three and nine months ended September 30, 2022 and 2021 is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Product cost of revenue $ 893 $ 893 $ 2,679 $ 2,679 Research and development 149 105 393 290 Selling, general and administrative 450 533 1,520 1,599 Totals $ 1,492 $ 1,531 $ 4,592 $ 4,568

Inventory (Tables)

Inventory (Tables)	9 Months Ended
Inventory (Tables)	Sep. 30, 2022
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventory as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Raw materials $ 45,599 $ 53,934 Finished goods: Manufactured finished goods 33,548 29,597 Deferred inventory costs 3,042 1,297 $ 82,189 $ 84,828

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
Property and Equipment (Tables)	Sep. 30, 2022
Property, Plant and Equipment [Abstract]
Summary of Components of Property and Equipment	Property and equipment as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Computers and purchased software $ 25,183 $ 25,775 Leasehold improvements 4,225 4,198 Furniture and fixtures 2,678 2,672 Machinery and equipment 35,681 37,325 Land 3,091 3,091 Building 4,765 4,765 Building improvements 7,337 7,291 Trial systems at customers’ sites 2,768 3,848 85,728 88,965 Less: Accumulated depreciation and amortization ( 65,462 ) ( 65,457 ) $ 20,266 $ 23,508

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	9 Months Ended
Accrued Expenses and Other Current Liabilities (Tables)	Sep. 30, 2022
Payables and Accruals [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, Current liabilities Accrued compensation and related taxes $ 15,759 $ 21,751 Accrued warranty 3,367 2,392 Inventory-related accruals 5,357 8,391 Warranty Settlement Provision (see Note 16) 6,453 — Other accrued expenses 10,817 8,848 Accrued expenses and other current liabilities $ 41,753 $ 41,382 Non-current liabilities Warranty Settlement Provision, net of current portion (see Note 16) $ 6,454 $ — Other accrued expenses, net of current portion 1,760 1,701 Other liabilities, net of current portion $ 8,214 $ 1,701
Summary of Changes in Amount Reserved for Warranty Costs	summary of changes in the amount reserved for warranty costs for the nine months ended September 30, 2022 and 2021: Nine Months Ended September 30, 2022 2021 Warranty reserve at beginning of period $ 2,392 $ 2,354 Provisions 2,371 2,015 Charges ( 1,396 ) ( 1,886 ) Warranty reserve at end of period $ 3,367 $ 2,483

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities	The following tables present information about the fair value of the Company’s financial assets and liabilities as of September 30, 2022 and December 31, 2021 and indicate the level of the fair value hierarchy utilized to determine such fair values: Fair Value Measurements as of September 30, 2022 Using: Level 1 Level 2 Level 3 Total Assets: Certificates of deposit—restricted cash $ — $ 3,108 $ — $ 3,108 Money market mutual funds 165,205 — — 165,205 $ 165,205 $ 3,108 $ — $ 168,313 Fair Value Measurements as of December 31, 2021 Using: Level 1 Level 2 Level 3 Total Assets: Certificates of deposit—restricted cash $ — $ 1,001 $ — $ 1,001 Money market mutual funds 93,792 — — 93,792 Foreign currency forward contract $ — 5 — 5 $ 93,792 $ 1,006 $ — $ 94,798 Liabilities: SARs $ — $ — $ 358 $ 358 $ — $ — $ 358 $ 358
Summary of Changes in Fair Values of Stock Appreciation Rights (SARs) Liability	The following table provides a summary of changes in the fair values of the Company’s SARs liability, for which fair value is determined by Level 3 inputs: Nine Months Ended September 30, 2022 2021 Fair value at beginning of period $ 358 $ 493 Change in fair value ( 159 ) 100 Exercises ( 199 ) ( 135 ) Fair value at end of period $ — $ 458

Debt (Tables)

Debt (Tables)	9 Months Ended
Debt (Tables)	Sep. 30, 2022
Debt Disclosure [Abstract]
Schedule of Current and Non-Current Debt Obligations	Current and non-current debt obligations reflected in the condensed consolidated balance sheets as of September 30, 2022 and December 31, 2021 consisted of the following: September 30, December 31, 2022 2021 Current liabilities: Term loan $ 3,000 $ 3,000 Current portion of principal payment obligations 3,000 3,000 Unamortized debt issuance costs, current portion ( 1,067 ) ( 1,076 ) Current portion of long-term debt, net of $ 1,933 $ 1,924 Non-current liabilities: Term loan $ 272,975 $ 275,225 Unamortized debt issuance costs, non-current portion ( 236 ) ( 1,032 ) Long-term debt, net of current portion and $ 272,739 $ 274,193
Schedule of Aggregate Minimum Future Principal Payments of Debt	As of September 30, 2022, aggregate minimum future principal payments of the Company’s debt are summarized as follows: Year Ending December 31, Remainder of 2022 $ 750 2023 275,225 Thereafter — $ 275,975

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
Stock-based Compensation (Tables)	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Summary of Stock Options Activity	A summary of stock option activity for the nine months ended September 30, 2022 is as follows: Number Weighted- Weighted- Aggregate (in years) Outstanding at January 1, 2022 5,919 $ 8.82 4.36 $ 4,205 Granted 1,578 3.87 Exercised ( 156 ) 1.95 Forfeited ( 684 ) 11.03 Outstanding at September 30, 2022 6,657 $ 7.58 4.86 $ 260 Options exercisable at September 30, 2022 4,997 $ 8.75 3.35 $ 256 Vested or expected to vest at September 30, 2022 6,563 $ 7.63 4.79 $ 260
Assumptions of Estimated Fair Value of Option on the Date of Grant Using Black-Scholes Option Pricing Model	The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model using the following assumptions: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Risk-free interest rate 3.7 % 1.0 % 1.7 %– 3.7 % 1.0 % Expected term (in years) 6.1 6.1 5.6 – 6.3 6.1 Expected volatility 41.5 % 38.6 % 38.5 %– 41.5 % 38.2 %- 38.6 % Expected dividend yield 0.0 % 0.0 % 0.0 % 0.0 %
Summary of RSU Activity	A summary of RSU activity for the nine months ended September 30, 2022 is as follows: Number of Weighted- Aggregate Unvested balance at January 1, 2022 4,309 $ 6.34 Granted 3,027 3.61 Vested ( 1,376 ) 6.89 $ 6,227 Forfeited ( 392 ) 6.30 Unvested balance at September 30, 2022 5,568 $ 4.72
Summary of PSU Activity	A summary of PSU activity for the nine months ended September 30, 2022 is as follows: Number of Weighted- Aggregate Unvested balance at January 1, 2022 442 $ 7.89 Granted 846 2.79 Vested — — $ — Forfeited ( 26 ) 7.89 Unvested balance at September 30, 2022 1,262 $ 4.47
Assumptions of Estimated Based on Monte Carlo Simulation Model	Compensation expense is based on the estimated value of the awards on the grant date, and is recognized over the period from the grant date through the expected vest dates of each vesting condition, both of which were estimated based on a Monte Carlo simulation model applying the following key assumptions: Nine months ended September 30, 2022 2021 Risk-free interest rate 2.8 % 0.2 % Volatility 79.1 % 78.6 % Dividend yield 0.0 % 0.0 % Cost of equity 13.2 % 12.0 % No PSUs were granted during the three months ended September 30, 2022 and 2021.
Summary of SAR Activity	A summary of SAR activity for the nine months ended September 30, 2022 is as follows: Number Weighted- Outstanding at January 1, 2022 200 $ 7.28 Granted — — Exercised ( 90 ) 1.69 Forfeited — — Outstanding at September 30, 2022 110 $ 11.86
Schedule of Stock-based Compensation Expense	Stock-based compensation expense related to stock options, RSUs, SARs and PSUs for the three and nine months ended September 30, 2022 and 2021 was classified in the condensed consolidated statements of operations and comprehensive (loss) income as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Cost of revenue $ 31 $ 29 $ 92 $ 95 Research and development expenses 824 557 2,113 1,971 Selling, general and administrative expenses 2,816 3,112 6,973 9,179 Total stock-based compensation $ 3,671 $ 3,698 $ 9,178 $ 11,245 The Company recognized stock-based compensation expense for the three and nine months ended September 30, 2022 and 2021 in the condensed consolidated balance sheet as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Change in fair value of SAR Liability $ — $ ( 188 ) $ ( 159 ) $ 100 Recognized as additional paid-in capital 3,671 3,886 9,337 11,145 Total stock-based compensation $ 3,671 $ 3,698 $ 9,178 $ 11,245

Net (Loss) Income per Share (Ta

Net (Loss) Income per Share (Tables)	9 Months Ended
Net (Loss) Income per Share (Tables)	Sep. 30, 2022
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net (Loss) Income Per Share Attributable to Common Stockholders	Basic and diluted net (loss) income per share attributable to common stockholders was calculated as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Numerator: Net (loss) income attributable to common $ ( 31,164 ) $ ( 876 ) $ ( 80,445 ) $ 1,680 Denominator: Weighted-average shares used to compute net 94,512 85,660 90,569 84,985 Dilutive effect of stock options — — — 1,765 Dilutive effect of restricted stock units — — — 2,198 Weighted-average shares used to compute net 94,512 85,660 90,569 88,948 Net (loss) income per share attributable to common Basic $ ( 0.33 ) $ ( 0.01 ) $ ( 0.89 ) $ 0.02 Diluted $ ( 0.33 ) $ ( 0.01 ) $ ( 0.89 ) $ 0.02
Schedule of Potential Common Shares Excluded from the Computation of Diluted Net (Loss) Income Per Share Attributable to Common Stockholders	The following potential common shares were excluded from the computation of diluted net (loss) income per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Options to purchase common stock 6,657 6,040 6,657 3,459 Unvested restricted stock units 5,568 4,380 5,568 723 Unvested performance-based stock units 1,262 442 1,262 —

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
Revenue from Contracts with Customers (Tables)	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Summary of Disaggregation of Revenue Based on Geographic Locations Determined by Customer's Shipping Address	The Company also disaggregates its revenue based on geographic locations of its customers, as determined by the customer’s shipping address, summarized as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 North America: U.S. $ 16,988 $ 40,671 $ 53,220 $ 101,534 Canada 14,556 11,087 39,655 61,875 Total North America 31,544 51,758 92,875 163,409 Europe, Middle East and Africa: 10,936 6,547 22,102 19,478 Asia-Pacific: Australia 14,448 24,329 51,740 68,527 Other 5,467 8,832 21,058 24,526 Total Asia-Pacific 19,915 33,161 72,798 93,053 Latin America 4,504 7,753 14,359 20,286 Total revenue (1) $ 66,899 $ 99,219 $ 202,134 $ 296,226 (1) Other than the U.S., Canada and Australia, no individual countries represented 10 % or more of the Company’s total revenue for any of the periods presented.
Summary of Disaggregates of Revenue Based on Product Line	The Company also disaggregates its revenue based on product line summarized as follows: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Product revenue: Wireless $ 19,891 $ 43,070 $ 68,047 $ 116,081 Fixed telco 14,971 20,187 42,625 51,209 Cable 20,573 24,495 56,449 94,729 Total product revenue 55,435 87,752 167,121 262,019 Service revenue: Wireless 1,478 1,141 4,363 3,416 Fixed telco 316 825 3,027 3,474 Cable 9,670 9,501 27,623 27,317 Total service revenue 11,464 11,467 35,013 34,207 Total revenue $ 66,899 $ 99,219 $ 202,134 $ 296,226

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
Segment Information (Tables)	Sep. 30, 2022
Segment Reporting [Abstract]
Schedule of Property and Equipment, Net by Location	The Company’s property and equipment, net by location was as follows: September 30, December 31, U.S. $ 15,095 $ 17,089 China 3,018 3,118 Australia 1,323 2,027 Other 830 1,274 Total property and equipment, net $ 20,266 $ 23,508

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Significant Accounting Policies [Line Items]
Restricted cash	$ 3,108,000	$ 1,000,000
Change in accounting principle accounting standards update adopted	true
Change in accounting principle, accounting standards update, early adoption [true false]	true
Change in accounting principle accounting standards update adoption date	Jan. 01, 2022
Change in accounting principle accounting standards update immaterial effect	true
Accounting standards update [extensible enumeration]	us-gaap:AccountingStandardsUpdate202108Member
Accounts Receivable, Extended Payment Terms
Significant Accounting Policies [Line Items]
Reserve for credit losses	$ 0	0	$ 0
Write off of uncollectible receivables	0	$ 0
Certificates of Deposit
Significant Accounting Policies [Line Items]
Restricted cash	1,008,000		1,008,000
Cash
Significant Accounting Policies [Line Items]
Restricted cash	$ 2,100,000		$ 2,100,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash in Accompanying Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2022		Dec. 31, 2021	Sep. 30, 2021		Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents	$ 193,494		$ 154,703	$ 156,460
Restricted cash included in other assets	$ 3,108			$ 1,000
Restricted Cash and Cash Equivalents, Noncurrent, Asset, Statement of Financial Position [Extensible List]	Other assets			Other assets
Cash and cash equivalents, restricted cash	$ 196,602	[1]	$ 157,804	$ 157,460	[1]	$ 158,461

[1] See Note 2 of the accompanying notes for a reconciliation of the ending balance of cash, cash equivalents and restricted cash shown in these unaudited condensed consolidated statements of cash flows.

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current portion of accounts receivable, net:
Current portion of accounts receivable, net	$ 49,040	$ 85,774	[1]
Accounts receivable, net of current portion:
Accounts receivable, net of current portion	57	115
Accounts receivable	49,097	85,889
Accounts Receivable, Net
Current portion of accounts receivable, net:
Current portion of accounts receivable, net	49,021	85,689
Accounts Receivable, Extended Payment Terms
Current portion of accounts receivable, net:
Current portion of accounts receivable, net	$ 19	$ 85

[1] Includes accounts receivable due from a related party of $ 1,817 at September 30, 2022 (see Note 15)

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Schedule of Significant Customers Represent 10% or More of Revenue or Accounts Receivable (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Customer A \| Revenue
Concentration Risk [Line Items]
Concentration risk percentage	17%		13%
Customer B \| Revenue
Concentration Risk [Line Items]
Concentration risk percentage		24%		20%
Customer B \| Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage					21%
Customer C \| Revenue
Concentration Risk [Line Items]
Concentration risk percentage				11%
Customer D \| Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage					19%
Customer E \| Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage					10%

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Finite Lived Intangible Assets [Line Items]
Cost	$ 46,545	$ 45,832
Accumulated Amortization	(19,280)	(14,688)
Net Balance	27,265	31,144
Developed Technology \| NetComm Wireless Limited
Finite Lived Intangible Assets [Line Items]
Cost	25,000	25,000
Accumulated Amortization	(11,609)	(8,930)
Net Balance	13,391	16,070
Customer Relationships \| NetComm Wireless Limited
Finite Lived Intangible Assets [Line Items]
Cost	18,000	18,000
Accumulated Amortization	(5,850)	(4,500)
Net Balance	12,150	13,500
Trade Name \| NetComm Wireless Limited
Finite Lived Intangible Assets [Line Items]
Cost	1,000	1,000
Accumulated Amortization	(1,000)	(830)
Net Balance		170
Purchased Software
Finite Lived Intangible Assets [Line Items]
Cost	2,545	1,832
Accumulated Amortization	(821)	(428)
Net Balance	$ 1,724	$ 1,404

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Amortization Expense on Existing Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2022	$ 1,506
2023	6,002
2024	5,899
2025	5,751
2026	3,607
Thereafter	4,500
Net Balance	$ 27,265	$ 31,144

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Summary of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 1,492	$ 1,531	$ 4,592	$ 4,568
Product Cost of Revenue
Finite Lived Intangible Assets [Line Items]
Amortization expense	893	893	2,679	2,679
Research and Development
Finite Lived Intangible Assets [Line Items]
Amortization expense	149	105	393	290
Selling, General and Administrative Expenses
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 450	$ 533	$ 1,520	$ 1,599

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 50,177	$ 50,177

Inventory - Schedule of Invento

Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 45,599	$ 53,934
Finished goods:
Manufactured finished goods	33,548	29,597
Deferred inventory costs	3,042	1,297
Total inventory	$ 82,189	$ 84,828

Inventory - Additional Informat

Inventory - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Inventory Disclosure [Abstract]
Decrease in inventory due to additional reserves	$ 5,934	$ (98)

Property and Equipment - Summar

Property and Equipment - Summary of Components of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 85,728	$ 88,965
Less: Accumulated depreciation and amortization	(65,462)	(65,457)
Property and equipment, net	20,266	23,508
Computers and Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	25,183	25,775
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,225	4,198
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,678	2,672
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	35,681	37,325
Land
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,091	3,091
Building
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,765	4,765
Building Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,337	7,291
Trial Systems at Customers' Sites
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,768	$ 3,848

Property and Equipment - Additi

Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Property Plant And Equipment [Line Items]
Depreciation and amortization expense on property and equipment	$ 1,704	$ 2,258	$ 5,744	$ 7,418
Trial Systems
Property Plant And Equipment [Line Items]
Transfers from (into) inventory into (from) property and equipment			(1,081)	(1,145)
Equipment
Property Plant And Equipment [Line Items]
Transfers from (into) inventory into (from) property and equipment			$ 1,629	$ 325

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current liabilities:
Accrued compensation and related taxes	$ 15,759	$ 21,751
Accrued warranty	3,367	2,392
Inventory-related accruals	5,357	8,391
Warranty Settlement Provision	6,453
Other accrued expenses	10,817	8,848
Total accrued expenses and other current liabilities	41,753	41,382
Non-current liabilities
Warranty Settlement Provision, net of current portion	6,454
Other accrued expenses, net of current portion	1,760	1,701
Other liabilities, net of current portion	$ 8,214	$ 1,701

Accrued Expenses and Other Cu_4

Accrued Expenses and Other Current Liabilities - Additional Information (Details) $ in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2022 AUD ($)	Sep. 30, 2022 USD ($)
Accrued Expenses And Other Current Liabilities [Line Items]
Warranty settlement provision	$ 20,000	$ 12,907
Warranty settlement provision, exchange rate	0.645	0.645
Standard product warranty description	the Company’s products are covered by warranties for software and hardware for periods ranging from 90 days to one year.
Extended product warranty description	the Company offers an extended warranty for periods typically of one to three years for agreed-upon fees.
Installment, frequency of periodic payment	annual
Warranty settlement period of payment	5 years
Minimum
Accrued Expenses And Other Current Liabilities [Line Items]
Product warranties period for software and hardware	90 days
Extended product warranty period for renewals of maintenance and support contracts	1 year
Maximum
Accrued Expenses And Other Current Liabilities [Line Items]
Product warranties period for software and hardware	1 year
Extended product warranty period for renewals of maintenance and support contracts	3 years

Accrued Expenses and Other Cu_5

Accrued Expenses and Other Current Liabilities - Summary of Changes in Amount Reserved for Warranty Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Product Warranties Disclosures [Abstract]
Warranty reserve at beginning of period	$ 2,392	$ 2,354
Provisions	2,371	2,015
Charges	(1,396)	(1,886)
Warranty reserve at end of period	$ 3,367	$ 2,483

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Assets fair value	$ 168,313	$ 94,798
Liabilities:
Liabilities fair value		358
Certificates of Deposit - Restricted Cash
Assets:
Assets fair value	3,108	1,001
Money Market Mutual Funds
Assets:
Assets fair value	165,205	93,792
Foreign Currency Forward Contracts
Assets:
Assets fair value		5
Level 1
Assets:
Assets fair value	165,205	93,792
Level 1 \| Money Market Mutual Funds
Assets:
Assets fair value	165,205	93,792
Level 2
Assets:
Assets fair value	3,108	1,006
Level 2 \| Certificates of Deposit - Restricted Cash
Assets:
Assets fair value	$ 3,108	1,001
Level 2 \| Foreign Currency Forward Contracts
Assets:
Assets fair value		5
Level 3
Liabilities:
Liabilities fair value		358
SARs \| Share Based Compensation Liability
Liabilities:
Liabilities fair value		358
SARs \| Level 3 \| Share Based Compensation Liability
Liabilities:
Liabilities fair value		$ 358

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair value, assets, transfers from Level 1 to Level 2	$ 0	$ 0
Fair value, assets, transfers from Level 2 to Level 1	0	0
Fair value, liabilities, transfers from Level 1 to Level 2	0	0
Fair value, liabilities, transfers from Level 2 to Level 1	0	0
Fair value, assets, transfers into Level 3	0	0
Fair value, assets, transfers out of Level 3	0	0
Fair value, liabilities, transfers into Level 3	0	0
Fair value, liabilities, transfers out of Level 3	$ 0	$ 0

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in Fair Values of Stock Appreciation Rights (SARs) Liability (Details) - Level 3 - Stock Appreciation Rights ("SARs") - Share Based Compensation Liability - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value at beginning of period	$ 358	$ 493
Change in fair value	(159)	100
Exercises	$ (199)	(135)
Fair value at end of period		$ 458

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
(Benefit from) provision for income taxes	$ (1,261)	$ (5,288)	$ 5,071	$ 220
Effective tax rate	3.90%	85.80%	(6.70%)	11.60%
Discrete tax provision (benefit)		$ (7,097)		$ (7,097)

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
Debt - Additional Information (Details) - USD ($)	Dec. 20, 2016	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Outstanding borrowings		$ 275,975,000		$ 275,975,000
JPMorgan Chase Bank, N. A.
Debt Instrument [Line Items]
Debt instrument, interest rate description				Borrowings under the Term Loan bear interest at a floating rate, which can be either a Eurodollar rate plus an applicable margin or, at the Company’s option, a base rate (defined as the highest of (x) the JPMorgan Chase, N.A. prime rate, (y) the federal funds effective rate, plus one-half percent (0.50%) per annum and (z) a one-month Eurodollar rate plus 1.00% per annum) plus an applicable margin. The applicable margin for borrowings under the Term Loan is 4.00% per annum for Eurodollar rate loans (subject to a 1.00% per annum interest rate floor) and 3.00% per annum for base rate loans. The interest rate payable under the Term Loan is subject to an increase of 2.00% per annum during the continuance of any payment default.
Debt instrument prepayment description				In addition, the Company is required to make mandatory prepayments under the Term Loan with respect to (i) 100% of the net cash proceeds from certain asset dispositions (including casualty and condemnation events) by the Company or certain of its subsidiaries, subject to certain exceptions and reinvestment provisions, (ii) 100% of the net cash proceeds from the issuance or incurrence of any additional debt by the Company or certain of its subsidiaries, subject to certain exceptions, and (iii) 50% of the Company’s excess cash flow, as defined in the credit agreement, subject to reduction upon its achievement of specified performance targets. In accordance with these provisions, a mandatory early prepayment of $6,775 was paid by the Company during the nine months ended September 30, 2021.
Percentage of net proceeds from asset dispositions to be used for mandatory prepayment	100%
Percentage of net cash proceeds from issuances or incurrence of additional Debt to be used for mandatory prepayment	100%
Percentage on excess cash flow for mandatory prepayments of debt	50%
Debt instrument, mandatory early prepayment of debt payable			$ 6,775,000		$ 6,775,000
Term Loan \| JPMorgan Chase Bank, N.A. and Barclays Bank PLC and Various Lenders
Debt Instrument [Line Items]
Maximum borrowing amount under facility	$ 300,000,000
Outstanding borrowings		$ 275,975,000		$ 275,975,000		$ 278,225,000
Term Loan \| JPMorgan Chase Bank, N. A.
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage	4%
Debt instrument, interest rate description				As of September 30, 2022, the interest rate on the Term Loan was 7.12% per annum, which was based on a one-month Eurodollar rate of 3.12% per annum plus the applicable margin of 4.00% per annum for Eurodollar rate loans. As of December 31, 2021, the interest rate on the Term Loan was 5.00% per annum, which was based on a one-month Eurodollar rate, at the applicable floor of 1.00% per annum plus the applicable margin of 4.00% per annum for Eurodollar rate loans.
Debt instrument, effective interest rate percentage		7.12%		7.12%		5%
Debt issuance costs	$ 7,811,000
Debt instrument, principal payment		$ 750,000	750,000	$ 2,250,000	9,025,000
Interest expense, including amortization of debt issuance costs		$ 4,696,000	$ 3,870,000	$ 12,270,000	$ 11,672,000
Debt instrument, maturity date	Dec. 20, 2023
Original principal amount of term loan amortization percentage	1%
Principal amount of loan	$ 300,000,000
Term Loan \| JPMorgan Chase Bank, N. A. \| Eurodollar Rate
Debt Instrument [Line Items]
Debt instrument, variable interest rate percentage				4%		4%
Debt instrument, effective interest rate percentage		3.12%		3.12%		1%
Term Loan \| JPMorgan Chase Bank, N. A. \| Floor Rate
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage	1%
Term Loan \| JPMorgan Chase Bank, N. A. \| Base Rate
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage	3%
Revolving Credit Facility \| JPMorgan Chase Bank, N.A. and Barclays Bank PLC and Various Lenders
Debt Instrument [Line Items]
Maximum borrowing amount under facility	$ 25,000,000
Revolving Credit Facility \| JPMorgan Chase Bank, N. A.
Debt Instrument [Line Items]
Debt instrument, interest rate increase	2%
Revolving Credit Facility \| JPMorgan Chase Bank, N. A. \| Federal Funds Effective Rate
Debt Instrument [Line Items]
Debt instrument, variable interest rate percentage	0.50%
Revolving Credit Facility \| JPMorgan Chase Bank, N. A. \| Eurodollar Rate
Debt Instrument [Line Items]
Debt instrument, variable interest rate percentage	1%

Debt - Schedule of Current and

Debt - Schedule of Current and Non-Current Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current liabilities:
Current portion of principal payment obligations	$ 3,000	$ 3,000
Unamortized debt issuance costs, current portion	(1,067)	(1,076)
Current portion of long-term debt, net of unamortized debt issuance costs	1,933	1,924
Non-current liabilities:
Unamortized debt issuance costs, non-current portion	(236)	(1,032)
Long-term debt, net of current portion and unamortized debt issuance costs	272,739	274,193
Term Loan
Current liabilities:
Current portion of principal payment obligations	3,000	3,000
Non-current liabilities:
Non-current portion of principal payment obligations	$ 272,975	$ 275,225

Debt - Schedule of Aggregate Mi

Debt - Schedule of Aggregate Minimum Future Principal Payments of Debt (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Debt Disclosure [Abstract]
Remainder of 2022	$ 750
2023	275,225
Aggregate minimum future principal payments of debt	$ 275,975

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Apr. 18, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Feb. 21, 2019
Class Of Stock [Line Items]
Common stock, par value		$ 0.001		$ 0.001		$ 0.001
Securities Purchase Agreement \| Verizon Ventures LLC
Class Of Stock [Line Items]
Common stock, par value	$ 0.001
Purchase price per share	$ 4.24
Aggregate purchase price	$ 39,530,000
Private Placement \| Securities Purchase Agreement \| Verizon Ventures LLC
Class Of Stock [Line Items]
Aggregate stock purchased	9,323,000
Common Stock
Class Of Stock [Line Items]
Stock repurchase program, common stock remaining authorized to be repurchased		$ 60,234		$ 60,234
Stock repurchase program, stock repurchased, shares		0	0	204,000	0
Stock repurchase program, stock repurchased, value				$ 1,192,000
Aggregate stock purchased				9,323,000
Common Stock \| Maximum
Class Of Stock [Line Items]
Stock repurchase program, common stock authorized to be repurchased							$ 75,000,000

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash proceeds received upon the exercise of options			$ 304,000	$ 3,532,000
Fair value of liability					$ 358,000
Unrecognized compensation cost	$ 24,928,000		$ 24,928,000
Weighted-average period of unrecognized compensation cost expected to be recognized			2 years 5 months 12 days
Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting date			Jan. 01, 2023
Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting date			Jan. 01, 2024
Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting date			Jan. 01, 2025
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value per share of options			$ 1.62	$ 3.15
Cash proceeds received upon the exercise of options			$ 304,000	$ 3,532,000
Intrinsic value of stock options exercised			$ 342,000	$ 5,182,000
RSUs and PSUs \| Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock in settlement of employee tax withholding obligations			456,000	779,000
Performance-Based Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			3 years	3 years
Number of shares, granted	0	0	846,000
Number of shares, forfeitures			26,000
Number of shares, unvested	1,262,000		1,262,000		442,000
Weighted-Average Exercise Price, Granted			$ 2.79
Stock Appreciation Rights
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			4 years
Number of shares, unvested	110,000		110,000		200,000
Award expiration period			10 years
Number of SAR exercised			(90,000)
Fair value of SAR	$ 1.69		$ 1.69
Stock Appreciation Rights \| Accrued Expenses And Other Current Liabilities
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of liability	$ 0		$ 0		$ 358,000
2017 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant	19,404,000		19,404,000
Number of remaining shares available for grant	5,916,000		5,916,000

Stock-based Compensation - Summ

Stock-based Compensation - Summary Stock Options Activity (Details) - 2017 Stock Incentive Plan - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning Balance \| shares	5,919
Number of Shares, Granted \| shares	1,578
Number of Shares, Exercised \| shares	(156)
Number of Shares, Forfeited \| shares	(684)
Number of Shares, Outstanding, Ending Balance \| shares	6,657	5,919
Number of Shares, Options exercisable at September 30, 2022 \| shares	4,997
Number of Shares, Vested or expected to vest at September 30, 2022 \| shares	6,563
Weighted-Average Exercise Price, Outstanding, Beginning Balance \| $ / shares	$ 8.82
Weighted-Average Exercise Price, Granted \| $ / shares	3.87
Weighted-Average Exercise Price, Exercised \| $ / shares	1.95
Weighted-Average Exercise Price, Forfeited \| $ / shares	11.03
Weighted-Average Exercise Price, Outstanding, Ending Balance \| $ / shares	7.58	$ 8.82
Weighted-Average Exercise Price, Options exercisable at September 30, 2022 \| $ / shares	8.75
Weighted-Average Exercise Price, Vested or expected to vest at September 30, 2022 \| $ / shares	$ 7.63
Weighted-Average Remaining Contractual Term, Outstanding	4 years 10 months 9 days	4 years 4 months 9 days
Weighted-Average Remaining Contractual Term, Options exercisable at September, 2022	3 years 4 months 6 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest at September 30, 2022	4 years 9 months 14 days
Aggregate Intrinsic Value, Outstanding \| $	$ 260	$ 4,205
Aggregate Intrinsic Value, Options exercisable at September 30, 2022 \| $	256
Aggregate Intrinsic Value, Vested or expected to vest at September 30, 2022 \| $	$ 260

Stock-based Compensation - Assu

Stock-based Compensation - Assumptions of Estimated Fair Value of Option on the Date of Grant Using Black-Scholes Option Pricing Model (Details) - Stock Options	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	3.70%	1%		1%
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days		6 years 1 month 6 days
Expected volatility	41.50%	38.60%
Expected dividend yield	0%	0%	0%	0%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate			1.70%
Expected term (in years)			5 years 7 months 6 days
Expected volatility			38.50%	38.20%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate			3.70%
Expected term (in years)			6 years 3 months 18 days
Expected volatility			41.50%	38.60%

Stock-based Compensation - Su_2

Stock-based Compensation - Summary of RSU Activity (Details) - Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Beginning Balance \| shares	4,309
Number of Shares, Granted \| shares	3,027
Number of Shares, Vested \| shares	(1,376)
Number of Shares, Forfeited \| shares	(392)
Number of Shares, Ending Balance \| shares	5,568
Weighted-Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 6.34
Weighted-Average Grant Date Fair Value, Granted \| $ / shares	3.61
Weighted-Average Grant Date Fair Value, Vested \| $ / shares	6.89
Weighted-Average Grant Date Fair Value, Forfeited \| $ / shares	6.30
Weighted-Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 4.72
Aggregate Fair Value, Vested \| $	$ 6,227

Stock-based Compensation - Su_3

Stock-based Compensation - Summary of PSU Activity (Details) - Performance-Based Stock Units - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of Shares, Beginning Balance			442,000
Number of Shares, Granted	0	0	846,000
Number of Shares, Forfeited			(26,000)
Number of Shares, Ending Balance	1,262,000		1,262,000
Weighted-Average Grant Date Fair Value, Beginning Balance			$ 7.89
Weighted-Average Grant Date Fair Value, Granted			2.79
Weighted-Average Grant Date Fair Value, Forfeited			7.89
Weighted-Average Grant Date Fair Value, Ending Balance	$ 4.47		$ 4.47

Stock-based Compensation - As_2

Stock-based Compensation - Assumptions of Estimated Based on Monte Carlo Simulation Model (Details) - Performance-Based Stock Units	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	2.80%	0.20%
Volatility	79.10%	78.60%
Dividend yield	0%	0%
Cost of equity	13.20%	12%

Stock-based Compensation - As_3

Stock-based Compensation - Assumptions of Estimated Based on Monte Carlo Simulation Model (Parenthetical) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022
Performance-Based Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares, granted	0	0	846,000

Stock-based Compensation - Su_4

Stock-based Compensation - Summary of SAR Activity (Details) - Stock Appreciation Rights - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of Shares, Beginning Balance	200
Number of Shares, Exercised	(90)
Number of Shares, Ending Balance	110
Weighted-Average Grant Date Fair Value, Beginning Balance	$ 7.28
Weighted-Average Exercise Price, Exercised	1.69
Weighted-Average Grant Date Fair Value, Ending Balance	$ 11.86

Stock-based Compensation - Sche

Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	$ 3,671	$ 3,698	$ 9,178	$ 11,245
Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	31	29	92	95
Research and Development Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	824	557	2,113	1,971
Selling, General and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	$ 2,816	$ 3,112	$ 6,973	$ 9,179

Stock-based Compensation - Su_5

Stock-based Compensation - Summary of Stock-based Compensation Expense Recognized in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-Based Payment Arrangement [Abstract]
Change in fair value of SAR Liability		$ (188)	$ (159)	$ 100
Recognized as additional paid-in capital	$ 3,671	3,886	9,337	11,145
Total stock-based compensation	$ 3,671	$ 3,698	$ 9,178	$ 11,245

Net (Loss) Income per Share - S

Net (Loss) Income per Share - Schedule of Basic and Diluted Net (Loss) Income Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net (loss) income attributable to common stockholders, basic	$ (31,164)	$ (876)	$ (80,445)	$ 1,680
Net (loss) income attributable to common stockholders, diluted	$ (31,164)	$ (876)	$ (80,445)	$ 1,680
Denominator:
Weighted-average shares used to compute net (loss) income per share attributable to common stockholders, basic	94,512	85,660	90,569	84,985
Dilutive effect of stock options				1,765
Dilutive effect of restricted stock units				2,198
Weighted-average shares used to compute net (loss) income per share attributable to common stockholders, diluted	94,512	85,660	90,569	88,948
Net (loss) income per share attributable to common stockholders:
Basic	$ (0.33)	$ (0.01)	$ (0.89)	$ 0.02
Diluted	$ (0.33)	$ (0.01)	$ (0.89)	$ 0.02

Net (Loss) Income per Share -_2

Net (Loss) Income per Share - Schedule of Potential Common Shares Excluded from the Computation of Diluted Net (Loss) Income Per Share Attributable to Common Stockholders (Details) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted net income per share	6,657	6,040	6,657	3,459
Unvested Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted net income per share	5,568	4,380	5,568	723
Unvested Performance-Based Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted net income per share	1,262	442	1,262

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Summary of Disaggregation of Revenue Based on Geographic Locations Determined by Customer's Shipping Address (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	[1]	$ 66,899	$ 99,219	$ 202,134	$ 296,226
U.S.
Disaggregation Of Revenue [Line Items]
Total revenue		16,988	40,671	53,220	101,534
North America - Canada
Disaggregation Of Revenue [Line Items]
Total revenue		14,556	11,087	39,655	61,875
North America
Disaggregation Of Revenue [Line Items]
Total revenue		31,544	51,758	92,875	163,409
Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Total revenue		10,936	6,547	22,102	19,478
Asia-Pacific - Australia
Disaggregation Of Revenue [Line Items]
Total revenue		14,448	24,329	51,740	68,527
Asia-Pacific - Other
Disaggregation Of Revenue [Line Items]
Total revenue		5,467	8,832	21,058	24,526
Asia-Pacific
Disaggregation Of Revenue [Line Items]
Total revenue		19,915	33,161	72,798	93,053
Latin America
Disaggregation Of Revenue [Line Items]
Total revenue		$ 4,504	$ 7,753	$ 14,359	$ 20,286

[1] Includes revenue during which a related party relationship existed of $ 3,041 and $ 13,591 during the three and nine months ended September 30, 2022 (see Note 15)

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Summary of Disaggregation of Revenue Based on Geographic Locations Determined by Customer's Shipping Address (Parenthetical) (Details) - Other than United States and Australia	9 Months Ended
	Sep. 30, 2022 Country
Disaggregation Of Revenue [Line Items]
Number of countries represents 10% or more of total revenue	0
Revenue \| Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Concentration risk percentage	10%

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Summary of Disaggregates of Revenue Based on Product Line (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	[1]	$ 66,899	$ 99,219	$ 202,134	$ 296,226
Product - Wireless
Disaggregation Of Revenue [Line Items]
Total revenue		19,891	43,070	68,047	116,081
Product - Fixed Telco
Disaggregation Of Revenue [Line Items]
Total revenue		14,971	825	42,625	3,474
Product - Cable
Disaggregation Of Revenue [Line Items]
Total revenue		20,573	9,501	56,449	27,317
Product
Disaggregation Of Revenue [Line Items]
Total revenue		55,435	87,752	167,121	262,019
Service - Wireless
Disaggregation Of Revenue [Line Items]
Total revenue		1,478	1,141	4,363	3,416
Service - Fixed Telco
Disaggregation Of Revenue [Line Items]
Total revenue		316	20,187	3,027	51,209
Service - Cable
Disaggregation Of Revenue [Line Items]
Total revenue		9,670	24,495	27,623	94,729
Service
Disaggregation Of Revenue [Line Items]
Total revenue		$ 11,464	$ 11,467	$ 35,013	$ 34,207

[1] Includes revenue during which a related party relationship existed of $ 3,041 and $ 13,591 during the three and nine months ended September 30, 2022 (see Note 15)

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Revenue remaining performance obligation amount	$ 39,396		$ 39,396
Accounts Receivable
Disaggregation Of Revenue [Line Items]
Contract assets	2,594		2,594		$ 95
Deferred Revenue
Disaggregation Of Revenue [Line Items]
Revenue	$ 3,139	$ 1,726	$ 11,630	$ 13,706

Revenue from Contracts with C_7

Revenue from Contracts with Customers - Additional Information (Details1)	Sep. 30, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01
Disaggregation Of Revenue [Line Items]
Revenue remaining performance obligation, percentage	85%
Revenue, remaining performance obligation, expected timing of satisfaction period	12 months
Minimum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-07-01
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	2 years
Maximum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-07-01
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	5 years

Segment Information - Additiona

Segment Information - Additional Information (Details)	9 Months Ended
Segment Information - Additional Information (Details)	Sep. 30, 2022 Segment
Segment Reporting [Abstract]
Number of operating segments	1

Segment Information - Schedule

Segment Information - Schedule of Property and Equipment, Net by Location (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Property and equipment, net	$ 20,266	$ 23,508
U.S.
Segment Reporting Information [Line Items]
Property and equipment, net	15,095	17,089
China
Segment Reporting Information [Line Items]
Property and equipment, net	3,018	3,118
Australia
Segment Reporting Information [Line Items]
Property and equipment, net	1,323	2,027
Other
Segment Reporting Information [Line Items]
Property and equipment, net	$ 830	$ 1,274

Related Parties - Additional In

Related Parties - Additional Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Related Party Transaction [Line Items]
Revenue recognized from transactions	$ 3,041		$ 13,591
Due from Affiliates	1,817		$ 1,817
Restricted Stock Units
Related Party Transaction [Line Items]
Number of shares, granted			3,027
Aggregate fair value vested			$ 6,227
Rongke Xie
Related Party Transaction [Line Items]
Compensation paid			$ 181	$ 187
Rongke Xie \| Restricted Stock Units
Related Party Transaction [Line Items]
Number of shares, granted			145
Award vesting period			4 years
Aggregate fair value vested			$ 600
Selling, general and administrative expenses recognized	26	$ 28	87	$ 78
Verizon and Affiliates
Related Party Transaction [Line Items]
Revenue recognized from transactions	3,041		13,591
Amounts received in cash			27,203
Due from Affiliates	1,817		1,817
Deferred revenue associated with related party	$ 16,775		$ 16,775

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2022 AUD ($)	Sep. 30, 2022 USD ($)	Jul. 21, 2022 USD ($)
Loss Contingencies [Line Items]
Alleged costs incurred to date			$ 31,000
Alleged costs incurred over next five years			25,000
Warranty settlement provision	$ 20,000	$ 12,907
Warranty settlement provision, exchange rate	0.645	0.645
Installment, frequency of periodic payment	annual
Alleged costs, total cash settlement proposal			$ 56,000
Warranty settlement period of payment	5 years
Minimum
Loss Contingencies [Line Items]
Estimated liability related to ongoing indemnification claim		$ 230

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - USD ($) $ in Thousands		9 Months Ended
	Nov. 02, 2022	Sep. 30, 2022	Sep. 30, 2021	Oct. 27, 2022
Subsequent Event [Line Items]
Payment for repurchase of debt		$ 2,250	$ 9,025
Subsequent Event \| Term Loan
Subsequent Event [Line Items]
Payment for repurchase of debt	$ 39,041
Debt instrument authorized amount				$ 50,000
Outstanding principal amount of debt, retired	$ 41,703