Nextdoor (KIND) 10-Q7 Nov 232023 Q3 Quarterly reportFinancial data

Company Profile

Cover

Cover - shares	9 Months Ended
Cover - shares	Sep. 30, 2023	Nov. 03, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-40246
Entity Registrant Name	Nextdoor Holdings, Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-1776836
Entity Address, Address Line One	420 Taylor Street
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94102
City Area Code	415
Local Phone Number	344-0333
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	KIND
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Entity Central Index Key	0001846069
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		182,078,094
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		203,049,749

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 48,444	$ 55,236
Marketable securities	491,283	528,067
Accounts receivable, net of allowance of $441 and $422 as of September 30, 2023 and December 31, 2022, respectively	29,991	29,770
Prepaid expenses and other current assets	11,052	12,185
Total current assets	580,770	625,258
Restricted cash, non-current	11,171	0
Property and equipment, net	9,050	11,818
Operating lease right-of-use assets	58,123	52,555
Intangible assets, net	1,746	3,067
Goodwill	1,211	1,211
Other assets	8,029	5,653
Total assets	670,100	699,562
Current liabilities:
Accounts payable	3,307	4,535
Operating lease liabilities, current	6,021	7,766
Accrued expenses and other current liabilities	25,313	22,362
Total current liabilities	34,641	34,663
Operating lease liabilities, non-current	62,011	53,831
Other liabilities, non-current	267	0
Total liabilities	96,919	88,494
Commitments and contingencies (Note 7)
Stockholders’ equity:
Additional paid-in capital	1,300,845	1,231,482
Accumulated other comprehensive loss	(2,212)	(2,196)
Accumulated deficit	(725,490)	(618,255)
Total stockholders’ equity	573,181	611,068
Total liabilities and stockholders’ equity	670,100	699,562
Class A Common Stock
Stockholders’ equity:
Common stock	18	15
Class B Common Stock
Stockholders’ equity:
Common stock	$ 20	$ 22

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts receivable, allowance for credit loss	$ 441	$ 422
Class A Common Stock
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock authorized (in shares)	2,500,000,000	2,500,000,000
Common stock issued (in shares)	180,104,000	153,693,000
Common stock outstanding (in shares)	180,104,000	153,693,000
Class B Common Stock
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock authorized (in shares)	500,000,000	500,000,000
Common stock issued (in shares)	203,417,000	218,029,000
Common stock outstanding (in shares)	203,417,000	218,029,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 56,092	$ 53,954	$ 162,752	$ 159,495
Costs and expenses:
Cost of revenue	10,723	9,882	31,074	29,124
Research and development	39,649	33,398	109,748	95,057
Sales and marketing	30,564	29,000	91,159	92,688
General and administrative	19,532	18,066	55,401	50,499
Total costs and expenses	100,468	90,346	287,382	267,368
Loss from operations	(44,376)	(36,392)	(124,630)	(107,873)
Interest income	6,766	2,703	18,635	5,347
Other income (expense), net	(217)	(709)	(526)	(1,602)
Loss before income taxes	(37,827)	(34,398)	(106,521)	(104,128)
Provision for income taxes	289	319	714	380
Net loss	$ (38,116)	$ (34,717)	$ (107,235)	$ (104,508)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.10)	$ (0.09)	$ (0.28)	$ (0.27)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.10)	$ (0.09)	$ (0.28)	$ (0.27)
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	381,482	377,756	376,832	381,571
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted(in shares)	381,482	377,756	376,832	381,571

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (38,116)	$ (34,717)	$ (107,235)	$ (104,508)
Other comprehensive income (loss):
Foreign currency translation adjustments	29	291	72	783
Change in unrealized loss on available-for-sale marketable securities	21	(709)	(88)	(4,157)
Total other comprehensive loss	50	(418)	(16)	(3,374)
Comprehensive loss	$ (38,066)	$ (35,135)	$ (107,251)	$ (107,882)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at beginning of period (in shares) at Dec. 31, 2021				78,954	304,701
Balance at beginning of period at Dec. 31, 2021	$ 744,985			$ 8	$ 30	$ 1,225,815	$ (529)	$ (480,339)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock units (in shares)				2,476	97
Tax withholdings on release of restricted stock units	(695)					(695)
Repurchase of common stock (in shares)				(23,252)
Repurchase of common stock	(77,232)			$ (2)		(77,230)
Conversion from Class B to Class A common stock (in shares)				88,049	(88,049)
Conversion from Class B to Class A common stock	0			$ 9	$ (9)
Issuance of common stock upon exercise of stock options (in shares)				3,046	2,434
Issuance of common stock upon exercise of stock options	11,219				$ 1	11,218
Issuance of common stock under employee stock purchase plan (in shares)				552
Issuance of common stock under employee stock purchase plan	1,430					1,430
Issuance of common stock in connection with acquisition (in shares)					173
Vesting of early exercised stock options	383					383
Vesting of restricted stock	4,289					4,289
Stock-based compensation	46,957					46,957
Other comprehensive income	(3,374)						(3,374)
Net loss	(104,508)							(104,508)
Balance at end of period (in shares) at Sep. 30, 2022				149,825	219,356
Balance at end of period at Sep. 30, 2022	623,454			$ 15	$ 22	1,212,167	(3,903)	(584,847)
Balance at beginning of period (in shares) at Jun. 30, 2022				154,979	230,699
Balance at beginning of period at Jun. 30, 2022	701,458			$ 16	$ 23	1,255,034	(3,485)	(550,130)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock units (in shares)				1,555
Repurchase of common stock (in shares)				(20,191)
Repurchase of common stock	(66,739)			$ (2)		(66,737)
Conversion from Class B to Class A common stock (in shares)				11,343	(11,343)
Conversion from Class B to Class A common stock	0			$ 1	$ (1)
Issuance of common stock upon exercise of stock options (in shares)				1,587
Issuance of common stock upon exercise of stock options	3,608					3,608
Issuance of common stock under employee stock purchase plan (in shares)				552
Issuance of common stock under employee stock purchase plan	1,430					1,430
Vesting of early exercised stock options	132					132
Vesting of restricted stock	1,430					1,430
Stock-based compensation	17,270					17,270
Other comprehensive income	(418)						(418)
Net loss	(34,717)							(34,717)
Balance at end of period (in shares) at Sep. 30, 2022				149,825	219,356
Balance at end of period at Sep. 30, 2022	623,454			$ 15	$ 22	1,212,167	(3,903)	(584,847)
Balance at beginning of period (in shares) at Dec. 31, 2022		153,693	218,029	153,693	218,029
Balance at beginning of period at Dec. 31, 2022	611,068			$ 15	$ 22	1,231,482	(2,196)	(618,255)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock units (in shares)				7,757
Tax withholdings on release of restricted stock units	(237)					(237)
Conversion from Class B to Class A common stock (in shares)				16,112	(16,112)
Conversion from Class B to Class A common stock	$ 0			$ 2	$ (2)
Issuance of common stock upon exercise of stock options (in shares)	3,010			1,510	1,500
Issuance of common stock upon exercise of stock options	$ 6,676					6,676
Issuance of common stock under employee stock purchase plan (in shares)				1,032
Issuance of common stock under employee stock purchase plan	2,016			$ 1		2,015
Vesting of early exercised stock options	174					174
Stock-based compensation	60,735					60,735
Other comprehensive income	(16)						(16)
Net loss	(107,235)							(107,235)
Balance at end of period (in shares) at Sep. 30, 2023		180,104	203,417	180,104	203,417
Balance at end of period at Sep. 30, 2023	573,181			$ 18	$ 20	1,300,845	(2,212)	(725,490)
Balance at beginning of period (in shares) at Jun. 30, 2023				168,422	209,194
Balance at beginning of period at Jun. 30, 2023	583,078			$ 17	$ 21	1,272,676	(2,262)	(687,374)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock units (in shares)				3,704
Tax withholdings on release of restricted stock units	(237)					(237)
Conversion from Class B to Class A common stock (in shares)				7,277	(7,277)
Conversion from Class B to Class A common stock	0			$ 1	$ (1)
Issuance of common stock upon exercise of stock options (in shares)				229	1,500
Issuance of common stock upon exercise of stock options	4,113					4,113
Issuance of common stock under employee stock purchase plan (in shares)				472
Issuance of common stock under employee stock purchase plan	940					940
Vesting of early exercised stock options	10					10
Stock-based compensation	23,343					23,343
Other comprehensive income	50						50
Net loss	(38,116)							(38,116)
Balance at end of period (in shares) at Sep. 30, 2023		180,104	203,417	180,104	203,417
Balance at end of period at Sep. 30, 2023	$ 573,181			$ 18	$ 20	$ 1,300,845	$ (2,212)	$ (725,490)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net loss	$ (107,235)	$ (104,508)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,356	4,169
Stock-based compensation	60,735	46,957
Bad debt expense	75	(40)
Accretion of investments	(6,505)	954
Other	245	(1,631)
Changes in operating assets and liabilities:
Accounts receivable, net	(296)	2,750
Prepaid expenses and other assets	2,815	5,806
Operating lease right-of-use assets	3,539	5,120
Accounts payable	(1,228)	(445)
Operating lease liabilities	(4,230)	(5,280)
Accrued expenses and other liabilities	3,393	5,351
Net cash used in operating activities	(44,336)	(40,797)
Cash flows from investing activities
Purchases of property and equipment	(268)	(2,182)
Purchases of marketable securities	(454,897)	(555,052)
Sales of marketable securities	81,266	7,822
Maturities of marketable securities	416,587	224,005
Loan to Opportunity Finance Network	(2,500)	0
Net cash provided by (used in) investing activities	40,188	(325,407)
Cash flows from financing activities
Proceeds from exercise of stock options	6,676	11,219
Proceeds from issuance of common stock under employee stock purchase plan	2,016	1,430
Payment of transaction costs related to the Reverse Recapitalization	0	(314)
Tax withholdings on release of restricted stock units	(237)	(695)
Repurchase of common stock	0	(77,232)
Prepayment under share repurchase program	0	(68)
Net cash provided by (used in) financing activities	8,455	(65,660)
Effect of exchange rate changes on cash and cash equivalents	72	783
Net increase (decrease) in cash and cash equivalents	4,379	(431,081)
Cash, cash equivalents, and restricted cash at beginning of period	55,236	521,812
Cash, cash equivalents, and restricted cash at end of period	59,615	90,731
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents	48,444	90,731
Restricted cash, non-current	11,171	0
Total cash, cash equivalents, and restricted cash	59,615	90,731
Non-cash investing and financing activities:
Vesting of restricted stock and early exercised stock options	174	4,672
Lease liabilities arising from obtaining right-of-use assets	10,665	0
Purchases of property and equipment not yet settled	$ 0	$ 734

Subsequent Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 7, 2023, the Company announced a cost reduction plan (the “Cost Reduction Plan”) intended to right size the business and align the workforce and other expenses with Nextdoor’s near term revenue expectations and long term business priorities. The Cost Reduction Plan will impact approximately 25% of the Company’s full-time employees. The Company currently estimates that it will incur one-time charges of approximately $12 million in connection with the Cost Reduction Plan, consisting primarily of cash expenditures for notice period and severance payments, employee benefits, and related costs. In addition, the Company expects to incur approximately $0.5 million in stock-based compensation expense relating to the acceleration of the vesting of equity awards in connection with the Cost Reduction Plan.

Description of Business

Description of Business	9 Months Ended
Description of Business	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of BusinessNextdoor Holdings, Inc. (“Nextdoor” or the “Company”) is headquartered in San Francisco, California. Nextdoor’s purpose is to cultivate a kinder world where everyone has a neighborhood they can rely on. That purpose enables the Company’s mission to be the neighborhood hub for trusted connections and the exchange of helpful information, goods, and services.On November 5, 2021 (the “Closing”), the Company consummated the transactions contemplated by the Agreement and Plan of Merger, dated July 6, 2021, as amended on September 30, 2021, by and among Khosla Ventures Acquisition Co. II (“KVSB”), a special purpose acquisition company, Lorelei Merger Sub Inc., and Nextdoor, Inc. (“Legacy Nextdoor”), with Legacy Nextdoor surviving as a wholly owned subsidiary of KVSB (the “Merger” and, collectively with the other transactions that occurred in connection with the Merger, the “Reverse Recapitalization”). In connection with the Closing, KVSB was renamed to Nextdoor Holdings, Inc.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company’s fiscal year ends on December 31. The condensed consolidated balance sheet as of December 31, 2022 included herein was derived from the audited financial statements as of that date. The Company has condensed or omitted certain information and note disclosures normally included in financial statements prepared in accordance with GAAP pursuant to the applicable required disclosures and regulations of the U.S. Securities and Exchange Commission (“SEC”). As such, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. In management’s opinion, the unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and reflect all adjustments, which include only normal recurring adjustments necessary for the fair statement of the Company’s financial position, results of operations, and cash flows. The results for the interim periods presented are not necessarily indicative of the results to be expected for the full year ending December 31, 2023 or any other future interim or annual period. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the unaudited condensed consolidated financial statements and accompanying notes. Estimates include, but are not limited to, valuation of financial instruments, valuation of common stock through the date of the Reverse Recapitalization, valuation of stock-based awards, revenue recognition, collectability of accounts receivable, valuation of acquired intangible assets and goodwill, useful lives of intangible assets, useful lives of property and equipment, the incremental borrowing rate applied in lease accounting, income taxes and deferred income tax assets and associated valuation allowances. The Company bases these estimates and assumptions on historical experience and various other assumptions that it considers reasonable. The actual results could differ materially from these estimates. Significant Accounting Policies There have been no changes to the Company’s significant accounting policies disclosed in Note 2 to the consolidated financial statements described in the Company’s Annual Report on Form 10-K as of and for the year ended December 31, 2022 that have had a material impact on the Company’s condensed consolidated financial statements and related notes, except as noted below. Restricted Cash The Company’s restricted cash balance is primarily invested in a savings account and pledged as collateral for standby letters of credit as security deposits for the Company’s office leases. Recently Adopted Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , and has since issued various amendments including ASU 2018-19, ASU 2019-04, and ASU 2019-05. The guidance and related amendments modify the accounting for credit losses for most financial assets and require the use of an expected loss model, replacing the currently used incurred loss method. Under this model, entities will be required to estimate the lifetime expected credit loss on such instruments and record an allowance to offset the amortized cost basis of the financial asset, resulting in a net presentation of the amount expected to be collected on the financial asset. The Company adopted this standard as of January 1, 2023, and the adoption did not have an impact on the Company’s unaudited condensed consolidated financial statements.

Deferred Revenue

Deferred Revenue	9 Months Ended
Deferred Revenue	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Deferred Revenue	Deferred RevenueIn certain advertising arrangements the Company requires payment upfront from its customers. The Company records deferred revenue when it collects cash from customers in advance of revenue recognition. As of September 30, 2023 and December 31, 2022, deferred revenue was $8.3 million and $6.0 million, respectively, and included within accrued expenses and other current liabilities on the condensed consolidated balance sheets. For the three months ended September 30, 2023 and 2022, revenue recognized from deferred revenue at the beginning of each period was $2.8 million and $2.6 million, respectively. For the nine months ended September 30, 2023 and 2022, revenue recognized from deferred revenue at the beginning of each period was $2.9 million and $2.9 million, respectively.Geographical Information Revenue disaggregated by geography based on the customers’ location was as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 United States $ 52,964 $ 52,205 $ 154,239 $ 153,715 International 3,128 1,749 8,513 5,780 Total $ 56,092 $ 53,954 $ 162,752 $ 159,495 Substantially all of the Company’s long-lived assets are located in the United States.

Cash Equivalents and Marketable

Cash Equivalents and Marketable Securities	9 Months Ended
Cash Equivalents and Marketable Securities	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Cash Equivalents and Marketable Securities	Cash Equivalents and Marketable Securities The amortized costs, unrealized gains and losses, and estimated fair values of the Company’s cash equivalents and marketable securities were as follows (in thousands): As of September 30, 2023 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds $ 28,609 $ — $ — $ 28,609 Corporate bonds 478 — — 478 Total cash equivalents $ 29,087 $ — $ — $ 29,087 Marketable securities: Certificates of deposit 50,460 14 (8) 50,466 Commercial paper 101,600 1 (213) 101,388 Corporate bonds 159,929 38 (746) 159,221 U.S. Treasury securities 70,921 — (1,260) 69,661 U.S. Agency bonds 76,343 — (268) 76,075 Asset-backed securities 34,525 7 (60) 34,472 Total marketable securities 493,778 60 (2,555) 491,283 Total $ 522,865 $ 60 $ (2,555) $ 520,370 As of December 31, 2022 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds $ 20,381 $ — $ — $ 20,381 Corporate bonds 6,021 3 — 6,024 Commercial paper 9,394 — (3) 9,391 Total cash equivalents $ 35,796 $ 3 $ (3) $ 35,796 Marketable securities: Certificates of deposit 44,732 9 (191) 44,550 Commercial paper 100,909 27 (92) 100,844 Corporate bonds 280,023 11 (1,980) 278,054 U.S. Treasury securities 41,646 3 (123) 41,526 U.S. Agency bonds 46,366 66 (22) 46,410 Asset-backed securities 16,798 — (115) 16,683 Total marketable securities 530,474 116 (2,523) 528,067 Total $ 566,270 $ 119 $ (2,526) $ 563,863 All marketable securities are designated as available-for-sale securities as of September 30, 2023 and December 31, 2022. The following table summarizes the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position. No investments had been in a continuous unrealized loss position for greater than 12 months as of December 31, 2022. As of September 30, 2023 Less than 12 Months 12 Months or Greater Total Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Certificates of deposit $ 19,670 $ (8) $ — $ — $ 19,670 $ (8) Commercial paper 96,403 (213) — — 96,403 (213) Corporate bonds 85,540 (523) 26,626 (223) 112,166 (746) U.S. Treasury securities 69,335 (1,260) — — 69,335 (1,260) U.S. Agency bonds 75,520 (268) — — 75,520 (268) Asset-backed securities 22,610 (38) 2,453 (22) 25,063 (60) Total $ 369,078 $ (2,310) $ 29,079 $ (245) $ 398,157 $ (2,555) The following tables present the contractual maturities of the Company’s marketable securities (in thousands): As of September 30, 2023 Amortized Cost Estimated Fair Value Due within one year $ 301,523 $ 300,785 Due after one to three years 192,255 190,498 Total $ 493,778 $ 491,283 As of December 31, 2022 Amortized Cost Estimated Fair Value Due within one year $ 473,133 $ 471,378 Due after one to four years 57,341 56,689 Total $ 530,474 $ 528,067

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company’s financial assets and liabilities measured at fair value on a recurring basis are classified by level within the fair value hierarchy. There were no financial assets or liabilities measured using Level 3 inputs as of September 30, 2023 and December 31, 2022. The following table presents information about the Company’s financial assets that are measured at fair value on a recurring basis (in thousands): As of September 30, 2023 Level 1 Level 2 Total Cash equivalents: Money market funds $ 28,609 $ — $ 28,609 Corporate bonds — 478 478 Total cash equivalents $ 28,609 $ 478 $ 29,087 Marketable securities: Certificates of deposit — 50,466 50,466 Commercial paper — 101,388 101,388 Corporate bonds — 159,221 159,221 U.S. Treasury securities — 69,661 69,661 U.S. Agency bonds — 76,075 76,075 Asset-backed securities — 34,472 34,472 Total marketable securities — 491,283 491,283 Total cash equivalents and marketable securities $ 28,609 $ 491,761 $ 520,370 As of December 31, 2022 Level 1 Level 2 Total Cash equivalents: Money market funds $ 20,381 $ — $ 20,381 Corporate bonds — 6,024 6,024 Commercial paper — 9,391 9,391 Total cash equivalents $ 20,381 $ 15,415 $ 35,796 Marketable securities: Certificates of deposit — 44,550 44,550 Commercial paper — 100,844 100,844 Corporate bonds — 278,054 278,054 U.S. Treasury securities — 41,526 41,526 U.S. Agency bonds — 46,410 46,410 Asset-backed securities — 16,683 16,683 Total marketable securities — 528,067 528,067 Total cash equivalents and marketable securities $ 20,381 $ 543,482 $ 563,863 The Company classifies its cash equivalents and marketable securities within Level 1 or Level 2 because it determines their fair values using quoted market prices or alternative pricing sources and models utilizing market observable inputs. There were no transfers between levels of the fair value hierarchy during the periods presented. Assets and Liabilities Measured at Fair Value on a Recurring Basis The carrying amounts of certain financial instruments, including cash held in banks, accounts receivable, and accounts payable approximate fair value due to their short-term maturities and are excluded from the fair value table above. Financial Instruments, Assets, and Liabilities Not Recorded at Fair Value The following table presents the fair value of assets not recorded at fair value (in thousands): As of September 30, 2023 Carrying Amount Level 1 Level 2 Level 3 Fair Value Assets Note receivable $ 7,500 $ — $ — $ 6,998 $ 6,998 As of December 31, 2022 Carrying Amount Level 1 Level 2 Level 3 Fair Value Assets Note receivable $ 5,000 $ — $ — $ 4,646 $ 4,646

Leases

Leases	9 Months Ended
Leases	Sep. 30, 2023
Leases [Abstract]
Leases	Leases The Company has entered into various non-cancellable office facility leases in various locations with original lease periods expiring between 2020 and 2029, with its primary office location in San Francisco, California. The Company entered into a lease consisting of multiple floors for its San Francisco headquarters in 2019, with a lease term through 2029. On January 30, 2023, the Company entered into a lease amendment for its headquarters lease. The lease amendment extended the lease term through April 30, 2032, and resulted in an increase to right-of-use assets and operating lease liabilities. The Company's lease agreements generally do not contain any material residual value guarantees or material restrictive covenants. The components of lease costs were as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Operating lease cost $ 2,333 $ 2,445 $ 7,037 $ 7,336 Short-term lease cost 545 620 1,358 1,190 Variable lease cost 645 221 1,959 635 Total $ 3,523 $ 3,286 $ 10,354 $ 9,161 Other information related to the Company’s operating leases was as follows (in thousands): Nine Months Ended September 30, 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 7,722 $ 7,497 ROU assets obtained in exchange for new operating lease liabilities $ 9,107 $ — Lease terms and discount rates for operating leases were as follows: As of September 30, 2023 2022 Weighted average remaining lease term (in years) 8.6 6.6 Weighted average discount rate 7.1 % 4.5 % As of September 30, 2023, future minimum lease payments under operating leases were as follows (in thousands): Remainder of 2023 $ 2,625 2024 10,657 2025 10,977 2026 10,777 2027 10,586 Thereafter 44,391 Total lease payments 90,013 Less: imputed interest (21,981) Present value of lease liabilities 68,032 Less: current operating lease liabilities (6,021) Long-term operating lease liabilities $ 62,011 The table above does not include lease payments that were not fixed at commencement or lease modification.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal matters From time to time, the Company is a party to a variety of claims, lawsuits, and proceedings which arise in the ordinary course of business, including claims of alleged infringement of intellectual property rights. The Company records a liability when it believes that it is probable that a loss will be incurred and the amount of loss or range of loss can be reasonably estimated. The Company discloses potential losses when they are reasonably possible. In the Company’s opinion, resolution of pending matters is not likely to have a material adverse impact on its consolidated results of operations, cash flows, or its financial position. Given the unpredictable nature of legal proceedings, the Company bases its estimate on the information available at the time of the assessment. As additional information becomes available, the Company reassesses the potential liability and may revise the estimate. There were no such material matters as of September 30, 2023 and December 31, 2022. Indemnification In the ordinary course of business, the Company often includes standard indemnification provisions in its arrangements with its customers, partners, suppliers, and vendors. Pursuant to these provisions, the Company may be obligated to indemnify such parties for losses or claims suffered or incurred in connection with its service, breach of representations or covenants, intellectual property infringement, or other claims made against such parties. These provisions may limit the time within which an indemnification claim can be made. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. For the three and nine months ended September 30, 2023 and 2022, the Company did not incur material costs to defend lawsuits or settle claims related to these indemnifications. The Company believes the fair value of these liabilities is not material and accordingly has no liabilities recorded for these agreements as of September 30, 2023 and December 31, 2022. Opportunity Finance Network Loan Agreement On June 29, 2022, the Company entered into a credit agreement with Opportunity Finance Network (“OFN”) to lend up to an aggregate of $15.0 million, unsecured, over the course of 24 months. OFN is a national network of community development financial institutions (“CDFIs”). OFN will use the loan proceeds to make low-cost, fixed-rate loans to OFN-member CDFIs that on-lend those loan proceeds to fund affordable housing, community facilities, small businesses, nonprofit organizations, consumer finance, and other eligible financing extended by such CDFIs. OFN may borrow in increments of $2.0 million or more and may not borrow more than $7.5 million within the first 12 months immediately following the closing date of June 29, 2022. Each disbursement made by the Company will bear interest at a rate of 0.75% per annum and will be due quarterly from OFN. The outstanding principal, plus any accrued and unpaid interest, for each disbursement becomes due and payable 10 years following the disbursement date. During the three months ended September 30, 2023, no disbursements were made related to this loan. During the nine months ended September 30, 2023, the Company made one loan disbursement of $2.5 million. During the year ended December 31, 2022, the Company made one loan disbursement of $5.0 million.

Common Stock and Stockholders_

Common Stock and Stockholders’ Equity	9 Months Ended
Common Stock and Stockholders’ Equity	Sep. 30, 2023
Equity [Abstract]
Common Stock and Stockholders’ Equity	Common Stock and Stockholders’ Equity Common Stock Subject to Repurchase Certain stock option grant agreements permit exercise prior to vesting. Upon termination of service of an employee, the Company has the right to repurchase any unvested, but issued, common stock at the original purchase price. The consideration received for an exercise of an option is accounted for as a deposit of the exercise price and is recorded as a liability. Upon vesting of the shares pursuant to the grant agreements, the shares and related liability are reclassified into stockholders’ equity. As of September 30, 2023, all shares of common stock subject to repurchase were fully vested with no balance remaining. As of December 31, 2022, the Company had $0.2 million recorded in accrued expenses and other current liabilities related to 101,593 unvested shares of common stock subject to repurchase. Equity Incentive Plans 2021 Equity Incentive Plan In November 2021, the Company’s Board of Directors and stockholders approved the Company’s 2021 Equity Incentive Plan (the “2021 Plan”) as a successor to the 2018 Equity Incentive Plan (the “2018 Plan”), with the purpose of granting stock-based awards to employees, directors, officers, and consultants, including stock options, restricted stock awards, and restricted stock units (“RSUs”). 2021 Employee Stock Purchase Plan In November 2021, the Company’s Board of Directors and stockholders approved the Company’s 2021 Employee Stock Purchase Plan (the “2021 ESPP”). Over a series of offering periods, each of which may consist of one or more purchase periods, eligible employees will be offered the option to purchase shares of Class A common stock at 85% of the lesser of the fair market value of Class A common stock on (i) the first business day of the applicable offering period and (ii) the date of purchase. Under the 2021 ESPP, the Company initially reserved 8,901,159 shares of Class A common stock for issuance, and the aggregate number of shares reserved will increase automatically on January 1 of each of 2022 through 2031 by the number of shares equal to the lesser of (i) one percent (1%) of the total number of outstanding shares of Class A common stock and Class B common stock as of the immediately preceding December 31, or (ii) a number of shares as may be determined by the Company’s Board of Directors. The aggregate number of shares issued over the term of the 2021 ESPP, subject to adjustments for stock-splits, recapitalizations, or similar events, may not exceed 89,011,590 shares. In February 2022, the Company commenced its first offering period under the 2021 ESPP. During the three and nine months ended September 30, 2023, 472,606 and 1,032,313 shares of Class A common stock were purchased under the 2021 ESPP, respectively. Share Repurchase Program On May 31, 2022, the Company’s Board of Directors authorized and approved a share repurchase program (the “Share Repurchase Program”) to repurchase up to $100.0 million in aggregate of the Company’s Class A common stock, with the authorization to expire on June 30, 2024. Repurchases of Class A common stock under the Share Repurchase Program may be made from time to time, on the open market, in privately negotiated transactions or by other methods, and in accordance with the limitations set forth in Rule 10b-18 promulgated under the Securities Exchange Act of 1934, as amended, and other applicable legal requirements. The timing of any repurchases will depend on market conditions and other investment opportunities, and will be made at the Company’s discretion. The Company currently anticipates that the Share Repurchase Program will extend through June 30, 2024, or such shorter period if $100.0 million in aggregate of shares of the Company’s Class A common stock have been repurchased. The Share Repurchase Program does not obligate the Company to repurchase any dollar amount or number of shares, and the program may be extended, modified, suspended, or discontinued at any time. When the Company repurchases shares under the Share Repurchase Program, it reduces the common stock component of stockholders’ equity by the par value of the repurchased shares. The excess of the repurchase price over par value is recorded to additional paid-in capital. All repurchased shares are retired and become authorized and unissued shares. During the three and nine months ended September 30, 2023, the Company did not repurchase or retire any shares of its Class A common stock. During the three and nine months ended September 30, 2022, the Company repurchased and retired 20,190,611 and 23,251,703 shares of Class A common stock at an average purchase price of $3.31 and $3.32 per share for an aggregate repurchase price of $66.7 million and $77.2 million, respectively. As of September 30, 2023, the Company had $22.8 million available for future share repurchases under the Share Repurchase Program. Stock Options and RSUs The Company may grant options to acquire shares of Class A common stock to employees, directors, officers, and consultants at a price not less than the fair market value of the shares at the date of grant. Options granted to a person who, at the time of the grant, owns more than 10% of the voting power of all classes of stock shall be at no less than 110% of the fair market value and expire five years from the date of grant. All other options generally have a contractual term of ten years. Options granted generally vest on a monthly basis over two two A summary of the Company’s stock option activity for the nine months ended September 30, 2023 and related information is as follows (in thousands, except per share data): Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value Outstanding at December 31, 2022 55,388 $ 2.67 7.5 $ 10,552 Options granted 2,936 $ 2.30 Options exercised (3,010) $ 2.22 Options forfeited or expired (3,604) $ 2.73 Outstanding at September 30, 2023 51,710 $ 2.68 6.5 $ 7,187 Exercisable at September 30, 2023 33,236 $ 2.16 5.5 $ 7,187 Vested or expected to vest at September 30, 2023 51,710 $ 2.68 6.5 $ 7,187 The intrinsic value is calculated as the difference between the exercise price of the underlying common stock option award and the fair value of the Company’s common stock as of the respective balance sheet date. The weighted average grant date fair value of options granted was $1.45 per share and $3.13 per share during the nine months ended September 30, 2023 and 2022, respectively. The intrinsic value of the options exercised was $1.8 million and $13.4 million for the nine months ended September 30, 2023 and 2022, respectively. Number of Shares Weighted Average Grant Date Fair Value Unvested at December 31, 2022 21,986 $ 4.25 RSUs granted 21,204 $ 2.37 RSUs vested (7,863) $ 3.55 RSUs forfeited (3,787) $ 4.11 Unvested at September 30, 2023 31,540 $ 3.18 Valuation Assumptions The following assumptions were used to calculate the fair value of employee and non-employee stock option grants made during the following periods: Nine Months Ended September 30, 2023 2022 Expected volatility 64.9% - 72.7% 53.9% -73.9% Expected term (in years) 5.0 - 6.2 6.0 Risk-free interest rate 3.4% - 4.3% 2.6% Expected dividend yield — — Fair value of common stock per share $1.91 - $3.31 $3.34 - $6.06 Stock-Based Compensation The Company recorded stock-based compensation expense in the condensed consolidated statements of operations as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Cost of revenue $ 835 $ 732 $ 2,311 $ 1,906 Research and development 12,107 9,630 31,804 25,914 Sales and marketing 3,582 2,621 9,140 7,617 General and administrative 6,819 4,287 17,480 11,520 Total $ 23,343 $ 17,270 $ 60,735 $ 46,957 As of September 30, 2023, there was $137.9 million of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 1.8 years.

Net Loss Per Share Attributable

Net Loss Per Share Attributable to Common Stockholders	9 Months Ended
Net Loss Per Share Attributable to Common Stockholders	Sep. 30, 2023
Earnings Per Share [Abstract]
Net Loss Per Share Attributable to Common Stockholders	Net Loss Per Share Attributable to Common Stockholders The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except per share data): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Class A Class B Class A Class B Class A Class B Class A Class B Net loss attributable to common stockholders $ (17,663) $ (20,453) $ (14,142) $ (20,575) $ (46,819) $ (60,416) $ (32,588) $ (71,920) Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic and diluted 176,780 204,702 153,877 223,879 164,527 212,305 118,984 262,587 Net loss per share attributable to Class A and Class B common stockholders, basic and diluted $ (0.10) $ (0.10) $ (0.09) $ (0.09) $ (0.28) $ (0.28) $ (0.27) $ (0.27) The following potentially dilutive securities outstanding have been excluded from the computations of diluted net loss per share because such securities have an anti-dilutive impact due to losses reported (in thousands): As of September 30, 2023 2022 Outstanding stock options 51,710 52,426 Unvested RSUs 31,540 20,921 Unvested early exercised stock options subject to repurchase — 184 Unvested restricted stock — 321 Shares issuable pursuant to the ESPP 2,481 2,539 Contingently issuable shares 7 7 Total 85,738 76,398

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s provision for income taxes for interim periods was determined using an estimate of its annual effective tax rate, adjusted for discrete items, if any, that arose during the period. Each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual effective tax rate changes, the Company makes a cumulative adjustment in such period. The Company’s quarterly tax provision, and estimate of its annual effective tax rate, is subject to variation due to several factors, including variability in pretax income or loss, the mix of jurisdictions to which such income or loss relates, tax law developments and changes in how the Company does business, such as acquisitions, intercompany transactions, or the Company’s corporate structure.

Geographical Information

Geographical Information	9 Months Ended
Geographical Information	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Geographical Information	Deferred RevenueIn certain advertising arrangements the Company requires payment upfront from its customers. The Company records deferred revenue when it collects cash from customers in advance of revenue recognition. As of September 30, 2023 and December 31, 2022, deferred revenue was $8.3 million and $6.0 million, respectively, and included within accrued expenses and other current liabilities on the condensed consolidated balance sheets. For the three months ended September 30, 2023 and 2022, revenue recognized from deferred revenue at the beginning of each period was $2.8 million and $2.6 million, respectively. For the nine months ended September 30, 2023 and 2022, revenue recognized from deferred revenue at the beginning of each period was $2.9 million and $2.9 million, respectively.Geographical Information Revenue disaggregated by geography based on the customers’ location was as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 United States $ 52,964 $ 52,205 $ 154,239 $ 153,715 International 3,128 1,749 8,513 5,780 Total $ 56,092 $ 53,954 $ 162,752 $ 159,495 Substantially all of the Company’s long-lived assets are located in the United States.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company’s fiscal year ends on December 31. The condensed consolidated balance sheet as of December 31, 2022 included herein was derived from the audited financial statements as of that date. The Company has condensed or omitted certain information and note disclosures normally included in financial statements prepared in accordance with GAAP pursuant to the applicable required disclosures and regulations of the U.S. Securities and Exchange Commission (“SEC”). As such, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.
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 amounts reported in the unaudited condensed consolidated financial statements and accompanying notes. Estimates include, but are not limited to, valuation of financial instruments, valuation of common stock through the date of the Reverse Recapitalization, valuation of stock-based awards, revenue recognition, collectability of accounts receivable, valuation of acquired intangible assets and goodwill, useful lives of intangible assets, useful lives of property and equipment, the incremental borrowing rate applied in lease accounting, income taxes and deferred income tax assets and associated valuation allowances. The Company bases these estimates and assumptions on historical experience and various other assumptions that it considers reasonable. The actual results could differ materially from these estimates.
Significant Accounting Policies and Recently Adopted Accounting Pronouncements	Significant Accounting Policies There have been no changes to the Company’s significant accounting policies disclosed in Note 2 to the consolidated financial statements described in the Company’s Annual Report on Form 10-K as of and for the year ended December 31, 2022 that have had a material impact on the Company’s condensed consolidated financial statements and related notes, except as noted below. In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , and has since issued various amendments including ASU 2018-19, ASU 2019-04, and ASU 2019-05. The guidance and related amendments modify the accounting for credit losses for most financial assets and require the use of an expected loss model, replacing the currently used incurred loss method. Under this model, entities will be required to estimate the lifetime expected credit loss on such instruments and record an allowance to offset the amortized cost basis of the financial asset, resulting in a net presentation of the amount expected to be collected on the financial asset. The Company adopted this standard as of January 1, 2023, and the adoption did not have an impact on the Company’s unaudited condensed consolidated financial statements.
Restricted Cash	Restricted Cash The Company’s restricted cash balance is primarily invested in a savings account and pledged as collateral for standby letters of credit as security deposits for the Company’s office leases.

Cash Equivalents and Marketab_2

Cash Equivalents and Marketable Securities (Tables)	9 Months Ended
Cash Equivalents and Marketable Securities (Tables)	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Cash and Cash Equivalents	The amortized costs, unrealized gains and losses, and estimated fair values of the Company’s cash equivalents and marketable securities were as follows (in thousands): As of September 30, 2023 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds $ 28,609 $ — $ — $ 28,609 Corporate bonds 478 — — 478 Total cash equivalents $ 29,087 $ — $ — $ 29,087 Marketable securities: Certificates of deposit 50,460 14 (8) 50,466 Commercial paper 101,600 1 (213) 101,388 Corporate bonds 159,929 38 (746) 159,221 U.S. Treasury securities 70,921 — (1,260) 69,661 U.S. Agency bonds 76,343 — (268) 76,075 Asset-backed securities 34,525 7 (60) 34,472 Total marketable securities 493,778 60 (2,555) 491,283 Total $ 522,865 $ 60 $ (2,555) $ 520,370 As of December 31, 2022 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds $ 20,381 $ — $ — $ 20,381 Corporate bonds 6,021 3 — 6,024 Commercial paper 9,394 — (3) 9,391 Total cash equivalents $ 35,796 $ 3 $ (3) $ 35,796 Marketable securities: Certificates of deposit 44,732 9 (191) 44,550 Commercial paper 100,909 27 (92) 100,844 Corporate bonds 280,023 11 (1,980) 278,054 U.S. Treasury securities 41,646 3 (123) 41,526 U.S. Agency bonds 46,366 66 (22) 46,410 Asset-backed securities 16,798 — (115) 16,683 Total marketable securities 530,474 116 (2,523) 528,067 Total $ 566,270 $ 119 $ (2,526) $ 563,863
Schedule of Marketable Securities	The amortized costs, unrealized gains and losses, and estimated fair values of the Company’s cash equivalents and marketable securities were as follows (in thousands): As of September 30, 2023 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds $ 28,609 $ — $ — $ 28,609 Corporate bonds 478 — — 478 Total cash equivalents $ 29,087 $ — $ — $ 29,087 Marketable securities: Certificates of deposit 50,460 14 (8) 50,466 Commercial paper 101,600 1 (213) 101,388 Corporate bonds 159,929 38 (746) 159,221 U.S. Treasury securities 70,921 — (1,260) 69,661 U.S. Agency bonds 76,343 — (268) 76,075 Asset-backed securities 34,525 7 (60) 34,472 Total marketable securities 493,778 60 (2,555) 491,283 Total $ 522,865 $ 60 $ (2,555) $ 520,370 As of December 31, 2022 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds $ 20,381 $ — $ — $ 20,381 Corporate bonds 6,021 3 — 6,024 Commercial paper 9,394 — (3) 9,391 Total cash equivalents $ 35,796 $ 3 $ (3) $ 35,796 Marketable securities: Certificates of deposit 44,732 9 (191) 44,550 Commercial paper 100,909 27 (92) 100,844 Corporate bonds 280,023 11 (1,980) 278,054 U.S. Treasury securities 41,646 3 (123) 41,526 U.S. Agency bonds 46,366 66 (22) 46,410 Asset-backed securities 16,798 — (115) 16,683 Total marketable securities 530,474 116 (2,523) 528,067 Total $ 566,270 $ 119 $ (2,526) $ 563,863
Schedule of Investments Classified by Contractual Maturity Date	The following tables present the contractual maturities of the Company’s marketable securities (in thousands): As of September 30, 2023 Amortized Cost Estimated Fair Value Due within one year $ 301,523 $ 300,785 Due after one to three years 192,255 190,498 Total $ 493,778 $ 491,283 As of December 31, 2022 Amortized Cost Estimated Fair Value Due within one year $ 473,133 $ 471,378 Due after one to four years 57,341 56,689 Total $ 530,474 $ 528,067
Schedule of Available-For-Sale of Securities	The following table summarizes the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position. No investments had been in a continuous unrealized loss position for greater than 12 months as of December 31, 2022. As of September 30, 2023 Less than 12 Months 12 Months or Greater Total Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Certificates of deposit $ 19,670 $ (8) $ — $ — $ 19,670 $ (8) Commercial paper 96,403 (213) — — 96,403 (213) Corporate bonds 85,540 (523) 26,626 (223) 112,166 (746) U.S. Treasury securities 69,335 (1,260) — — 69,335 (1,260) U.S. Agency bonds 75,520 (268) — — 75,520 (268) Asset-backed securities 22,610 (38) 2,453 (22) 25,063 (60) Total $ 369,078 $ (2,310) $ 29,079 $ (245) $ 398,157 $ (2,555)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value on Recurring Basis	The following table presents information about the Company’s financial assets that are measured at fair value on a recurring basis (in thousands): As of September 30, 2023 Level 1 Level 2 Total Cash equivalents: Money market funds $ 28,609 $ — $ 28,609 Corporate bonds — 478 478 Total cash equivalents $ 28,609 $ 478 $ 29,087 Marketable securities: Certificates of deposit — 50,466 50,466 Commercial paper — 101,388 101,388 Corporate bonds — 159,221 159,221 U.S. Treasury securities — 69,661 69,661 U.S. Agency bonds — 76,075 76,075 Asset-backed securities — 34,472 34,472 Total marketable securities — 491,283 491,283 Total cash equivalents and marketable securities $ 28,609 $ 491,761 $ 520,370 As of December 31, 2022 Level 1 Level 2 Total Cash equivalents: Money market funds $ 20,381 $ — $ 20,381 Corporate bonds — 6,024 6,024 Commercial paper — 9,391 9,391 Total cash equivalents $ 20,381 $ 15,415 $ 35,796 Marketable securities: Certificates of deposit — 44,550 44,550 Commercial paper — 100,844 100,844 Corporate bonds — 278,054 278,054 U.S. Treasury securities — 41,526 41,526 U.S. Agency bonds — 46,410 46,410 Asset-backed securities — 16,683 16,683 Total marketable securities — 528,067 528,067 Total cash equivalents and marketable securities $ 20,381 $ 543,482 $ 563,863
Schedule of Financial Instruments, Assets, and Liabilities Not Recorded at Fair Value	The following table presents the fair value of assets not recorded at fair value (in thousands): As of September 30, 2023 Carrying Amount Level 1 Level 2 Level 3 Fair Value Assets Note receivable $ 7,500 $ — $ — $ 6,998 $ 6,998 As of December 31, 2022 Carrying Amount Level 1 Level 2 Level 3 Fair Value Assets Note receivable $ 5,000 $ — $ — $ 4,646 $ 4,646

Leases (Tables)

Leases (Tables)	9 Months Ended
Leases (Tables)	Sep. 30, 2023
Leases [Abstract]
Schedule of Components of Lease Costs, Other Information, and Lease Terms and Discount Rates	The components of lease costs were as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Operating lease cost $ 2,333 $ 2,445 $ 7,037 $ 7,336 Short-term lease cost 545 620 1,358 1,190 Variable lease cost 645 221 1,959 635 Total $ 3,523 $ 3,286 $ 10,354 $ 9,161 Other information related to the Company’s operating leases was as follows (in thousands): Nine Months Ended September 30, 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 7,722 $ 7,497 ROU assets obtained in exchange for new operating lease liabilities $ 9,107 $ — Lease terms and discount rates for operating leases were as follows: As of September 30, 2023 2022 Weighted average remaining lease term (in years) 8.6 6.6 Weighted average discount rate 7.1 % 4.5 %
Schedule of Future Minimum Lease Payments under Operating Leases	As of September 30, 2023, future minimum lease payments under operating leases were as follows (in thousands): Remainder of 2023 $ 2,625 2024 10,657 2025 10,977 2026 10,777 2027 10,586 Thereafter 44,391 Total lease payments 90,013 Less: imputed interest (21,981) Present value of lease liabilities 68,032 Less: current operating lease liabilities (6,021) Long-term operating lease liabilities $ 62,011

Common Stock and Stockholders_2

Common Stock and Stockholders’ Equity (Tables)	9 Months Ended
Common Stock and Stockholders’ Equity (Tables)	Sep. 30, 2023
Equity [Abstract]
Schedule of Stock Option Activity	A summary of the Company’s stock option activity for the nine months ended September 30, 2023 and related information is as follows (in thousands, except per share data): Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value Outstanding at December 31, 2022 55,388 $ 2.67 7.5 $ 10,552 Options granted 2,936 $ 2.30 Options exercised (3,010) $ 2.22 Options forfeited or expired (3,604) $ 2.73 Outstanding at September 30, 2023 51,710 $ 2.68 6.5 $ 7,187 Exercisable at September 30, 2023 33,236 $ 2.16 5.5 $ 7,187 Vested or expected to vest at September 30, 2023 51,710 $ 2.68 6.5 $ 7,187
Schedule of Restricted Stock Unit Activity	A summary of the Company’s RSU activity for the nine months ended September 30, 2023 and related information is as follows (in thousands, except per share data): Number of Shares Weighted Average Grant Date Fair Value Unvested at December 31, 2022 21,986 $ 4.25 RSUs granted 21,204 $ 2.37 RSUs vested (7,863) $ 3.55 RSUs forfeited (3,787) $ 4.11 Unvested at September 30, 2023 31,540 $ 3.18
Schedule of Assumptions Used to Calculate Fair Value of Stock Option Grants	The following assumptions were used to calculate the fair value of employee and non-employee stock option grants made during the following periods: Nine Months Ended September 30, 2023 2022 Expected volatility 64.9% - 72.7% 53.9% -73.9% Expected term (in years) 5.0 - 6.2 6.0 Risk-free interest rate 3.4% - 4.3% 2.6% Expected dividend yield — — Fair value of common stock per share $1.91 - $3.31 $3.34 - $6.06
Schedule of Stock-based Compensation Expense	The Company recorded stock-based compensation expense in the condensed consolidated statements of operations as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Cost of revenue $ 835 $ 732 $ 2,311 $ 1,906 Research and development 12,107 9,630 31,804 25,914 Sales and marketing 3,582 2,621 9,140 7,617 General and administrative 6,819 4,287 17,480 11,520 Total $ 23,343 $ 17,270 $ 60,735 $ 46,957

Net Loss Per Share Attributab_2

Net Loss Per Share Attributable to Common Stockholders (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except per share data): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Class A Class B Class A Class B Class A Class B Class A Class B Net loss attributable to common stockholders $ (17,663) $ (20,453) $ (14,142) $ (20,575) $ (46,819) $ (60,416) $ (32,588) $ (71,920) Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic and diluted 176,780 204,702 153,877 223,879 164,527 212,305 118,984 262,587 Net loss per share attributable to Class A and Class B common stockholders, basic and diluted $ (0.10) $ (0.10) $ (0.09) $ (0.09) $ (0.28) $ (0.28) $ (0.27) $ (0.27)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following potentially dilutive securities outstanding have been excluded from the computations of diluted net loss per share because such securities have an anti-dilutive impact due to losses reported (in thousands): As of September 30, 2023 2022 Outstanding stock options 51,710 52,426 Unvested RSUs 31,540 20,921 Unvested early exercised stock options subject to repurchase — 184 Unvested restricted stock — 321 Shares issuable pursuant to the ESPP 2,481 2,539 Contingently issuable shares 7 7 Total 85,738 76,398

Geographical Information (Table

Geographical Information (Tables)	9 Months Ended
Geographical Information (Tables)	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Revenue Disaggregated by Geography	Revenue disaggregated by geography based on the customers’ location was as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 United States $ 52,964 $ 52,205 $ 154,239 $ 153,715 International 3,128 1,749 8,513 5,780 Total $ 56,092 $ 53,954 $ 162,752 $ 159,495

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Nov. 07, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Subsequent Event [Line Items]
Stock-based compensation expense		$ 23,343	$ 17,270	$ 60,735	$ 46,957
Subsequent Event \| Cost Reduction Plan \| Employee Severance
Subsequent Event [Line Items]
Full-time employee reduction, percentage	25%
Restructuring charges	$ 12,000
Stock-based compensation expense	$ 500

Deferred Revenue (Details)

Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Deferred Revenue (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Deferred revenue	$ 8.3		$ 8.3		$ 6
Revenue recognized from contract with customer	$ 2.8	$ 2.6	$ 2.9	$ 2.9

Cash Equivalents and Marketab_3

Cash Equivalents and Marketable Securities - Amortized Cost, Unrealized Gains and Losses, and Estimated Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Cash equivalents:
Amortized Cost	$ 29,087	$ 35,796
Unrealized Gain	0	3
Unrealized Loss	0	(3)
Estimated Fair Value	29,087	35,796
Marketable securities:
Amortized Cost	493,778	530,474
Unrealized Gain	60	116
Unrealized Loss	(2,555)	(2,523)
Estimated Fair Value	491,283	528,067
Total
Amortized Cost	522,865	566,270
Unrealized Gain	60	119
Unrealized Loss	(2,555)	(2,526)
Estimated Fair Value	520,370	563,863
Certificates of deposit
Marketable securities:
Amortized Cost	50,460	44,732
Unrealized Gain	14	9
Unrealized Loss	(8)	(191)
Estimated Fair Value	50,466	44,550
Commercial paper
Marketable securities:
Amortized Cost	101,600	100,909
Unrealized Gain	1	27
Unrealized Loss	(213)	(92)
Estimated Fair Value	101,388	100,844
Corporate bonds
Marketable securities:
Amortized Cost	159,929	280,023
Unrealized Gain	38	11
Unrealized Loss	(746)	(1,980)
Estimated Fair Value	159,221	278,054
U.S. Treasury securities
Marketable securities:
Amortized Cost	70,921	41,646
Unrealized Gain	0	3
Unrealized Loss	(1,260)	(123)
Estimated Fair Value	69,661	41,526
U.S. Agency bonds
Marketable securities:
Amortized Cost	76,343	46,366
Unrealized Gain	0	66
Unrealized Loss	(268)	(22)
Estimated Fair Value	76,075	46,410
Asset-backed securities
Marketable securities:
Amortized Cost	34,525	16,798
Unrealized Gain	7	0
Unrealized Loss	(60)	(115)
Estimated Fair Value	34,472	16,683
Money market funds
Cash equivalents:
Amortized Cost	28,609	20,381
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	28,609	20,381
Corporate bonds
Cash equivalents:
Amortized Cost	478	6,021
Unrealized Gain	0	3
Unrealized Loss	0	0
Estimated Fair Value	$ 478	6,024
Commercial paper
Cash equivalents:
Amortized Cost		9,394
Unrealized Gain		0
Unrealized Loss		(3)
Estimated Fair Value		$ 9,391

Cash Equivalents and Marketab_4

Cash Equivalents and Marketable Securities - Schedule of Gross Unrealized Losses For Available-For-Sale of Securities (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Cash and Cash Equivalents [Line Items]
Less than 12 Months , Fair Value	$ 369,078
Less than 12 Months , Gross Unrealized Loss	(2,310)
12 Months or Greater , Fair Value	29,079
12 Months or Greater , Gross Unrealized Loss	(245)
Fair Value	398,157
Gross Unrealized Loss	(2,555)
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Less than 12 Months , Fair Value	19,670
Less than 12 Months , Gross Unrealized Loss	(8)
12 Months or Greater , Fair Value	0
12 Months or Greater , Gross Unrealized Loss	0
Fair Value	19,670
Gross Unrealized Loss	(8)
Commercial paper
Cash and Cash Equivalents [Line Items]
Less than 12 Months , Fair Value	96,403
Less than 12 Months , Gross Unrealized Loss	(213)
12 Months or Greater , Fair Value	0
12 Months or Greater , Gross Unrealized Loss	0
Fair Value	96,403
Gross Unrealized Loss	(213)
Corporate bonds
Cash and Cash Equivalents [Line Items]
Less than 12 Months , Fair Value	85,540
Less than 12 Months , Gross Unrealized Loss	(523)
12 Months or Greater , Fair Value	26,626
12 Months or Greater , Gross Unrealized Loss	(223)
Fair Value	112,166
Gross Unrealized Loss	(746)
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Less than 12 Months , Fair Value	69,335
Less than 12 Months , Gross Unrealized Loss	(1,260)
12 Months or Greater , Fair Value	0
12 Months or Greater , Gross Unrealized Loss	0
Fair Value	69,335
Gross Unrealized Loss	(1,260)
U.S. Agency bonds
Cash and Cash Equivalents [Line Items]
Less than 12 Months , Fair Value	75,520
Less than 12 Months , Gross Unrealized Loss	(268)
12 Months or Greater , Fair Value	0
12 Months or Greater , Gross Unrealized Loss	0
Fair Value	75,520
Gross Unrealized Loss	(268)
Asset-backed securities
Cash and Cash Equivalents [Line Items]
Less than 12 Months , Fair Value	22,610
Less than 12 Months , Gross Unrealized Loss	(38)
12 Months or Greater , Fair Value	2,453
12 Months or Greater , Gross Unrealized Loss	(22)
Fair Value	25,063
Gross Unrealized Loss	$ (60)

Cash Equivalents and Marketab_5

Cash Equivalents and Marketable Securities - Maturities of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due within one year	$ 301,523
Due after one to three years	192,255
Total	493,778	$ 530,474
Estimated Fair Value
Due within one year	300,785
Due after one to three years	190,498
Total	491,283	528,067
Amortized Cost
Due within one year		473,133
Due after one to four years		57,341
Total	493,778	530,474
Estimated Fair Value
Due within one year		471,378
Due after one to four years		56,689
Total	$ 491,283	$ 528,067

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - Fair Value, Recurring - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	$ 520,370,000	$ 563,863,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Financial liabilities	$ 0	$ 0

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 29,087	$ 35,796
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	28,609	20,381
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	478	6,024
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		9,391
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	29,087	35,796
Marketable securities	491,283	528,067
Total cash equivalents and marketable securities	520,370	563,863
Fair Value, Recurring \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	50,466	44,550
Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	101,388	100,844
Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	159,221	278,054
Fair Value, Recurring \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	69,661	41,526
Fair Value, Recurring \| U.S. Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	76,075	46,410
Fair Value, Recurring \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	34,472	16,683
Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	28,609	20,381
Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	478	6,024
Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		9,391
Level 1 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	28,609	20,381
Marketable securities	0	0
Total cash equivalents and marketable securities	28,609	20,381
Level 1 \| Fair Value, Recurring \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| U.S. Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	28,609	20,381
Level 1 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Level 1 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Level 2 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	478	15,415
Marketable securities	491,283	528,067
Total cash equivalents and marketable securities	491,761	543,482
Level 2 \| Fair Value, Recurring \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	50,466	44,550
Level 2 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	101,388	100,844
Level 2 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	159,221	278,054
Level 2 \| Fair Value, Recurring \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	69,661	41,526
Level 2 \| Fair Value, Recurring \| U.S. Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	76,075	46,410
Level 2 \| Fair Value, Recurring \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	34,472	16,683
Level 2 \| Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Level 2 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 478	6,024
Level 2 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		$ 9,391

Fair Value Measurements - Fin_2

Fair Value Measurements - Financial Instruments, Assets, and Liabilities Not Recorded at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable	$ 0	$ 0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable	6,998	4,646
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable	7,500	5,000
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable	$ 6,998	$ 4,646

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Leases - Lease Cost (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease cost	$ 2,333	$ 2,445	$ 7,037	$ 7,336
Short-term lease cost	545	620	1,358	1,190
Variable lease cost	645	221	1,959	635
Total	$ 3,523	$ 3,286	$ 10,354	$ 9,161

Leases - Other Lease Informatio

Leases - Other Lease Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating cash flows from operating leases	$ 7,722	$ 7,497
ROU assets obtained in exchange for new operating lease liabilities	$ 9,107	$ 0
Weighted average remaining lease term (in years)	8 years 7 months 6 days	6 years 7 months 6 days
Weighted average discount rate (as a percent)	7.10%	4.50%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Remainder of 2023	$ 2,625
2024	10,657
2025	10,977
2026	10,777
2027	10,586
Thereafter	44,391
Total lease payments	90,013
Less: imputed interest	(21,981)
Present value of lease liabilities	68,032
Less: current operating lease liabilities	(6,021)	$ (7,766)
Long-term operating lease liabilities	$ 62,011	$ 53,831

Commitments and Contingencies (

Commitments and Contingencies (Details) - Opportunity Finance Network $ in Millions		3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 29, 2022 USD ($)	Sep. 30, 2023 USD ($) disbursement	Sep. 30, 2023 USD ($) disbursement	Dec. 31, 2022 USD ($) disbursement
Other Commitments [Line Items]
Loans agreement, maximum lending capacity	$ 15
Loan agreement, lending grand, terms (in months)	24 months
Loan agreement, increments borrowing amount	$ 2
Fixed interest rate (as percent)	0.75%
Loan agreement, terms (in years)	10 years
Number of loan disbursement \| disbursement		0	1	1
Loan disbursement		$ 2.5	$ 2.5	$ 5
Maximum
Other Commitments [Line Items]
Loan agreement, increments borrowing amount	$ 7.5

Common Stock and Stockholders_3

Common Stock and Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	May 31, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Current liability related to common stock subject to repurchase						$ 0.2
Unvested shares of common stock subject to repurchase (in shares)						101,593
Options granted, weighted average grant date fair value (in USD per share)				$ 1.45	$ 3.13
Intrinsic value of options exercised				$ 1.8	$ 13.4
Unrecognized stock-based compensation expense		$ 137.9		$ 137.9
Unrecognized stock-based compensation expense, expected period of recognition (in years)				1 year 9 months 18 days
Class A Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock repurchase program, authorized amount							$ 100
Common stock retired (in shares)		0	20,190,611	0	23,251,703
Average cost per share (in USD per share)			$ 3.31		$ 3.32
Common stock retired, amount			$ 66.7		$ 77.2
Stock repurchase program, remaining authorized repurchase amount		$ 22.8		$ 22.8
Outstanding stock options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Minimum threshold of voting power (as a percent)				10%
Minimum proportion of fair market value of stock options granted to grantees that own more than 10% of voting power (as a percent)				110%
Expiration period (in years)				10 years
Outstanding stock options \| Minimum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period (in years)				2 years
Outstanding stock options \| Maximum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period (in years)				4 years
Stock Options - Grantees Owning >10% of Voting Power
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Expiration period (in years)				5 years
Unvested RSUs \| Class A Common Stock \| Minimum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period (in years)				2 years
Unvested RSUs \| Class A Common Stock \| Maximum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period (in years)				4 years
The 2021 Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares reserved for issuance (in shares)		46,008,885		46,008,885
Increase in number of stock available for grant as a proportion of common stock outstanding (as a percent)				5%
The 2021 Plan \| Class A Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Common stock purchased (in shares)		472,606		1,032,313
The 2021 Plan \| ESPP \| Class A Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares reserved for issuance (in shares)	8,901,159
ESPP, purchase price as proportion of common stock price (as a percent)	85%
The 2021 Plan \| ESPP \| Class B Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares reserved for issuance (in shares)	89,011,590
Increase in number of stock available for grant as a proportion of common stock outstanding (as a percent)	1%

Common Stock and Stockholders_4

Common Stock and Stockholders’ Equity - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Number of Options
Beginning balance (in shares) \| shares	55,388
Options granted (in shares) \| shares	2,936
Options exercised (in shares) \| shares	(3,010)
Options forfeited or expired (in shares) \| shares	(3,604)
Ending balance (in shares) \| shares	51,710	55,388
Exercisable (in shares) \| shares	33,236
Vested or expected to vest (in shares) \| shares	51,710
Weighted Average Exercise Price
Beginning balance (in USD per share) \| $ / shares	$ 2.67
Options granted (in USD per share) \| $ / shares	2.30
Options exercised (in USD per share) \| $ / shares	2.22
Options forfeited and expired (in USD per share) \| $ / shares	2.73
Ending balance (in USD per share) \| $ / shares	2.68	$ 2.67
Exercisable (in USD per share) \| $ / shares	2.16
Vested or expected to vest (in USD per share) \| $ / shares	$ 2.68
Additional Disclosures
Options outstanding, weighted average remaining contractual term (years)	6 years 6 months	7 years 6 months
Exercisable, weighted average remaining contractual term (years)	5 years 6 months
Vested or expected to vest (years)	6 years 6 months
Options outstanding, aggregate intrinsic value \| $	$ 7,187	$ 10,552
Exercisable, aggregate intrinsic value \| $	7,187
Vested or expected to vest, aggregate intrinsic value \| $	$ 7,187

Common Stock and Stockholders_5

Common Stock and Stockholders’ Equity - Restricted Stock Units (Details) - Restricted Stock Units shares in Thousands	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Number of Shares
Beginning balance (in shares) \| shares	21,986
RSUs granted (in shares) \| shares	21,204
RSUs vested (in shares) \| shares	(7,863)
RSUs forfeited (in shares) \| shares	(3,787)
Ending balance (in shares) \| shares	31,540
Weighted Average Grant Date Fair Value
Beginning balance (in USD per share) \| $ / shares	$ 4.25
RSUs granted (in USD per share) \| $ / shares	2.37
RSUs vested (in USD per share) \| $ / shares	3.55
RSUs forfeited (in USD per share) \| $ / shares	4.11
Ending balance (in USD per share) \| $ / shares	$ 3.18

Common Stock and Stockholders_6

Common Stock and Stockholders’ Equity - Fair Value Assumptions (Details) - Employee and Non-employee Stock Option - $ / shares	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum (as a percent)	64.90%	53.90%
Expected volatility, maximum (as a percent)	72.70%	73.90%
Expected term (in years)		6 years
Risk-free interest rate, Minimum (as a percent)	3.40%
Risk-free interest rate, Maximum (as a percent)	4.30%
Risk-free interest rate (as a percent)		2.60%
Expected dividend yield (as a percent)	0%	0%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	5 years
Fair value of common stock per share (in USD per share)	$ 1.91	$ 3.34
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 years 2 months 12 days
Fair value of common stock per share (in USD per share)	$ 3.31	$ 6.06

Common Stock and Stockholders_7

Common Stock and Stockholders’ Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 23,343	$ 17,270	$ 60,735	$ 46,957
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	835	732	2,311	1,906
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	12,107	9,630	31,804	25,914
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	3,582	2,621	9,140	7,617
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 6,819	$ 4,287	$ 17,480	$ 11,520

Net Loss Per Share Attributab_3

Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	381,482	377,756	376,832	381,571
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted(in shares)	381,482	377,756	376,832	381,571
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.10)	$ (0.09)	$ (0.28)	$ (0.27)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.10)	$ (0.09)	$ (0.28)	$ (0.27)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders, Basic	$ (17,663)	$ (14,142)	$ (46,819)	$ (32,588)
Net loss attributable to common stockholders, diluted	$ (17,663)	$ (14,142)	$ (46,819)	$ (32,588)
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	176,780	153,877	164,527	118,984
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted(in shares)	176,780	153,877	164,527	118,984
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.10)	$ (0.09)	$ (0.28)	$ (0.27)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.10)	$ (0.09)	$ (0.28)	$ (0.27)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders, Basic	$ (20,453)	$ (20,575)	$ (60,416)	$ (71,920)
Net loss attributable to common stockholders, diluted	$ (20,453)	$ (20,575)	$ (60,416)	$ (71,920)
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	204,702	223,879	212,305	262,587
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted(in shares)	204,702	223,879	212,305	262,587
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.10)	$ (0.09)	$ (0.28)	$ (0.27)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.10)	$ (0.09)	$ (0.28)	$ (0.27)

Net Loss Per Share Attributab_4

Net Loss Per Share Attributable to Common Stockholders - Potentially Dilutive Securities Outstanding (Details) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	85,738	76,398
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	51,710	52,426
Unvested RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	31,540	20,921
Unvested early exercised stock options subject to repurchase
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	0	184
Unvested restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	0	321
Shares issuable pursuant to the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	2,481	2,539
Contingently issuable shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	7	7

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income tax expense	$ 289	$ 319	$ 714	$ 380

Geographical Information (Detai

Geographical Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Geographical Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 56,092	$ 53,954	$ 162,752	$ 159,495
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	52,964	52,205	154,239	153,715
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 3,128	$ 1,749	$ 8,513	$ 5,780