FuelCell Energy (FCEL) 10-Q10 Jun 212021 Q2 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Apr. 30, 2021	Jun. 04, 2021
Cover [Abstract]
Entity Registrant Name	FUELCELL ENERGY, INC.
Entity Central Index Key	0000886128
Document Type	10-Q
Document Period End Date	Apr. 30, 2021
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Trading Symbol	FCEL
Title of 12(b) Security	Common stock, par value $0.0001 per share
Security Exchange Name	NASDAQ
Current Fiscal Year End Date	--10-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity File Number	1-14204
Entity Tax Identification Number	06-0853042
Entity Common Stock, Shares Outstanding		322,492,804
Entity Address, State or Province	CT
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Address, Address Line One	3 Great Pasture Road
Entity Address, City or Town	Danbury
Entity Address, Postal Zip Code	06810
City Area Code	203
Local Phone Number	825-6000
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Current assets:
Cash and cash equivalents, unrestricted		$ 139,086	$ 149,867
Restricted cash and cash equivalents - short-term	[1]	17,427	9,233
Accounts receivable, net		12,147	9,563
Unbilled receivables		7,660	8,041
Inventories		58,920	50,971
Other current assets		10,317	6,306
Total current assets		245,557	233,981
Restricted cash and cash equivalents - long-term		14,669	32,952
Inventories - long-term	[2]	4,586	8,986
Project assets		187,242	161,809
Property, plant and equipment, net		35,417	36,331
Operating lease right-of-use assets, net		8,201	10,098
Goodwill		4,075	4,075
Intangible assets, net		19,318	19,967
Other assets		16,526	15,339
Total assets		535,591	523,538
Current liabilities:
Current portion of long-term debt		8,575	21,366
Current portion of operating lease liabilities		875	939
Accounts payable		15,884	9,576
Accrued liabilities		13,419	15,681
Deferred revenue		17,464	10,399
Preferred stock obligation of subsidiary			938
Total current liabilities		56,217	58,899
Long-term deferred revenue		26,698	31,501
Long-term preferred stock obligation of subsidiary			18,265
Long-term operating lease liabilities		8,190	9,817
Long-term debt and other liabilities		75,580	150,651
Total liabilities		166,685	269,133
Stockholders' equity:
Common stock ($0.0001 par value); 500,000,000 and 337,500,000 shares authorized as of April 30, 2021 and October 31, 2020, respectively; 322,492,804 and 294,706,758 shares issued and outstanding as of April 30, 2021 and October 31, 2020, respectively		32	29
Additional paid-in capital		1,538,831	1,359,454
Accumulated deficit		(1,229,073)	(1,164,196)
Accumulated other comprehensive loss		(741)	(739)
Treasury stock, Common, at cost (61,836 and 56,411 shares as of April 30, 2021		(503)	(432)
Deferred compensation		503	432
Total stockholders' equity		309,049	194,548
Total liabilities and stockholders' equity		535,591	523,538
Series B Preferred Stock [Member]
Current liabilities:
Redeemable preferred stock		$ 59,857	$ 59,857

[1]	Short-term restricted cash and cash equivalents are amounts expected to be released and categorized as unrestricted cash within twelve months of the balance sheet date.
[2]	Long-term inventory includes modules that are contractually required to be segregated for use as exchange modules for specific project assets.

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2021	Oct. 31, 2020
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	500,000,000	337,500,000
Common stock, shares issued	322,492,804	294,706,758
Common stock, shares outstanding	322,492,804	294,706,758
Treasury stock, shares	61,836	56,411
Series B Preferred Stock [Member]
Preferred Stock, Liquidation Preference, Value	$ 64,020	$ 64,020

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Revenues:
Revenues	$ 13,953	$ 18,880	$ 28,830	$ 35,144
Costs of revenues:
Costs of revenues	18,709	18,713	37,204	31,696
Gross (loss) profit	(4,756)	167	(8,374)	3,448
Operating expenses:
Administrative and selling expenses	9,670	7,168	18,602	12,434
Research and development expenses	2,964	1,141	4,787	2,296
Total costs and expenses	12,634	8,309	23,389	14,730
Loss from operations	(17,390)	(8,142)	(31,763)	(11,282)
Interest expense	(1,563)	(3,584)	(4,108)	(6,861)
Loss on extinguishment of debt			(11,156)
Loss on extinguishment of Series 1 preferred share obligation			(934)
Change in fair value of common stock warrant liability		(3,372)	(15,974)	(37,617)
Other income, net	32	340	(946)	871
Loss before benefit (provision) for income taxes	(18,921)	(14,758)	(64,881)	(54,889)
Benefit (provision) for income taxes	4	(11)	4	(31)
Net loss	(18,917)	(14,769)	(64,877)	(54,920)
Series B preferred stock dividends	(800)	(800)
Net loss attributable to common stockholders	$ (19,717)	$ (15,569)	$ (66,477)	$ (56,651)
Loss per share basic and diluted:
Net loss per share attributable to common stockholders	$ (0.06)	$ (0.07)	$ (0.21)	$ (0.27)
Basic and diluted weighted average shares outstanding	322,500,592	211,000,091	317,219,129	206,560,031
Series B Preferred Stock [Member]
Operating expenses:
Series B preferred stock dividends	$ (800)	$ (800)	$ (1,600)	$ (1,731)
Product [Member]
Costs of revenues:
Costs of revenues	1,921	2,838	4,287	4,854
Service and License [Member]
Revenues:
Revenues	660	6,972	5,573	12,584
Costs of revenues:
Costs of revenues	2,867	5,967	7,966	7,585
Generation [Member]
Revenues:
Revenues	6,185	4,631	11,076	10,073
Costs of revenues:
Costs of revenues	9,422	5,692	16,537	11,249
Advanced Technologies [Member]
Revenues:
Revenues	7,108	7,277	12,181	12,487
Costs of revenues:
Costs of revenues	$ 4,499	$ 4,216	$ 8,414	$ 8,008

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (18,917)	$ (14,769)	$ (64,877)	$ (54,920)
Foreign currency translation adjustments	(60)	(42)	(2)	(91)
Total comprehensive loss	$ (18,977)	$ (14,811)	$ (64,879)	$ (55,011)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Deferred Compensation [Member]	Total
Balance at at Oct. 31, 2019	$ 19	$ 1,151,454	$ (1,075,089)	$ (647)	$ (466)	$ 466	$ 75,737
Balance at (in shares) at Oct. 31, 2019	193,608,684
Sale of common stock, net of fees	$ 1	3,501					3,502
Sale of common stock, net of fees (in shares)	7,938,228
Orion warrant exercises	$ 1	25,993					25,994
Orion warrant exercises (in shares)	9,396,320
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans		(6)					(6)
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares)	2,585
Share based compensation		488					488
Preferred dividends - Series B		(931)					(931)
Effect of foreign currency translation				(49)			(49)
Adjustment for deferred compensation					29
Adjustment for deferred compensation (in shares)	20,012
Adjustment for deferred compensation						(29)
Net loss			(40,151)				(40,151)
Balance at at Jan. 31, 2020	$ 21	1,180,499	(1,115,240)	(696)	(437)	437	64,584
Balance at (in shares) at Jan. 31, 2020	210,965,829
Balance at at Oct. 31, 2019	$ 19	1,151,454	(1,075,089)	(647)	(466)	466	75,737
Balance at (in shares) at Oct. 31, 2019	193,608,684
Effect of foreign currency translation							(91)
Net loss							(54,920)
Balance at at Apr. 30, 2020	$ 21	1,180,042	(1,130,009)	(738)	(437)	437	49,316
Balance at (in shares) at Apr. 30, 2020	211,052,401
Balance at at Jan. 31, 2020	$ 21	1,180,499	(1,115,240)	(696)	(437)	437	64,584
Balance at (in shares) at Jan. 31, 2020	210,965,829
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans		(32)					(32)
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares)	86,572
Share based compensation		375					375
Preferred dividends - Series B		(800)					(800)
Effect of foreign currency translation				(42)			(42)
Net loss			(14,769)				(14,769)
Balance at at Apr. 30, 2020	$ 21	1,180,042	(1,130,009)	(738)	(437)	437	49,316
Balance at (in shares) at Apr. 30, 2020	211,052,401
Balance at at Oct. 31, 2020	$ 29	1,359,454	(1,164,196)	(739)	(432)	432	$ 194,548
Balance at (in shares) at Oct. 31, 2020	294,706,758						294,706,758
Sale of common stock, net of fees	$ 3	156,363					$ 156,366
Sale of common stock, net of fees (in shares)	25,000,000
Orion warrant exercises		21,824					21,824
Orion warrant exercises (in shares)	2,700,000
Common stock issued, non-employee compensation		45					45
Common stock issued, non-employee compensation, (in shares)	2,734
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans		8					8
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares)	4,521
Share based compensation		1,417					1,417
Preferred dividends - Series B		(800)					(800)
Effect of foreign currency translation				58			58
Adjustment for deferred compensation					(30)
Adjustment for deferred compensation (in shares)	(1,669)
Adjustment for deferred compensation						30
Release of a share reserve	(48)
Net loss			(45,960)				(45,960)
Balance at at Jan. 31, 2021	$ 32	1,538,311	(1,210,156)	(681)	(462)	462	327,506
Balance at (in shares) at Jan. 31, 2021	322,412,296
Balance at at Oct. 31, 2020	$ 29	1,359,454	(1,164,196)	(739)	(432)	432	$ 194,548
Balance at (in shares) at Oct. 31, 2020	294,706,758						294,706,758
Effect of foreign currency translation							$ (2)
Net loss							(64,877)
Balance at at Apr. 30, 2021	$ 32	1,538,831	(1,229,073)	(741)	(503)	503	$ 309,049
Balance at (in shares) at Apr. 30, 2021	322,492,804						322,492,804
Balance at at Jan. 31, 2021	$ 32	1,538,311	(1,210,156)	(681)	(462)	462	$ 327,506
Balance at (in shares) at Jan. 31, 2021	322,412,296
Sale of common stock, net of fees		5					5
Orion warrant exercises		269					269
Orion warrant exercises (in shares)	14,026
Common stock issued, non-employee compensation		55					55
Common stock issued, non-employee compensation, (in shares)	5,456
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans		(262)					(262)
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares)	64,782
Share based compensation		1,253					1,253
Preferred dividends - Series B		(800)					(800)
Effect of foreign currency translation				(60)			(60)
Adjustment for deferred compensation					(41)
Adjustment for deferred compensation (in shares)	(3,756)
Adjustment for deferred compensation						41
Net loss			(18,917)				(18,917)
Balance at at Apr. 30, 2021	$ 32	$ 1,538,831	$ (1,229,073)	$ (741)	$ (503)	$ 503	$ 309,049
Balance at (in shares) at Apr. 30, 2021	322,492,804						322,492,804

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Cash flows from operating activities:
Net loss	$ (64,877)	$ (54,920)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	2,670	863
Depreciation and amortization	10,412	9,102
Change in fair value of common stock warrant liability	15,974	37,617
Non-cash charge (benefit) for extinguishment of preferred stock obligation of subsidiary	934	(475)
Non-cash interest expense on preferred stock and debt obligations	2,475	3,497
Non-cash charge for extinguishment of debt	7,156
Unrealized (gain) loss on derivative contract	(228)	526
Operating lease expense	761	315
Operating lease payments	(586)	(460)
Unrealized foreign currency losses (gains)	873	(948)
Other non-cash transactions, net	372	766
(Increase) decrease in operating assets:
Accounts receivable	(2,584)	(2,825)
Unbilled receivables	(645)	(641)
Inventories	(13,617)	(6,117)
Other assets	(2,930)	(288)
(Decrease) Increase in operating liabilities:
Accounts payable	3,280	(3,868)
Accrued liabilities	(2,864)	777
Deferred revenue, royalty & license fee income	2,262	2,360
Net cash used in operating activities	(41,162)	(14,719)
Cash flows from investing activities:
Capital expenditures	(960)	(55)
Project asset expenditures	(21,212)	(13,633)
Project asset acquisition		(611)
Net cash used in investing activities	(22,172)	(14,299)
Cash flows from financing activities:
Repayment of debt	(91,669)	(21,409)
Proceeds from debt, net of debt discount		87,757
Payment of deferred financing costs		(2,697)
Fees for common stock issued for benefit plans, net of issuances	(15)
Payment of preferred dividends and return of capital	(1,600)	(4,403)
Repayment of preferred stock obligation of subsidiary	(21,541)
Common stock issuance, net of fees	156,368
Proceeds from sale of common stock and warrant exercises, net	923	3,502
Net cash provided by financing activities	42,466	62,750
Effects on cash from changes in foreign currency rates	(2)	(91)
Net (decrease) increase in cash, cash equivalents and restricted cash	(20,870)	33,641
Cash, cash equivalents and restricted cash-beginning of period	192,052	39,778
Cash, cash equivalents and restricted cash-end of period	171,182	73,419
Supplemental cash flow disclosures:
Cash interest paid and early prepayment charge	8,790	3,188
Noncash financing and investing activity:
Operating lease liabilities	1,459	489
Operating lease right-of-use assets	1,459	489
Net noncash reclassifications from project assets to inventory	8,929	1,152
Warrant exercises	21,170	25,994
Accrued purchase of fixed assets, cash to be paid in subsequent period	491	68
Accrued purchase of project assets, cash to be paid in subsequent period	$ 3,078	$ 1,273

Nature of Business and Basis of

Nature of Business and Basis of Presentation	6 Months Ended
Nature of Business and Basis of Presentation	Apr. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	Note 1. Nature of Business and Basis of Presentation FuelCell Energy, Inc., together with its subsidiaries (the “Company”, “FuelCell Energy”, “we”, “us”, or “our”), is a leading integrated fuel cell company. Founded in 1969, FuelCell Energy is a manufacturer of clean fuel cell power platforms delivering power and thermal energy and capable of delivering hydrogen, long-duration hydrogen energy storage, and carbon capture applications. We develop turn-key distributed power generation solutions and operate and provide comprehensive service for the life of the power plant. FuelCell Energy is focused on growing its global presence in delivering environmentally responsible distributed baseload power solutions through its proprietary, molten-carbonate and solid oxide fuel cell technologies. We are working to expand the proprietary technologies that we have developed over the past five decades into new product platforms, applications, markets and geographies. Our mission and purpose is to utilize our proprietary, state-of-the-art fuel cell platforms to enable a world empowered by clean energy and contribute to climate change mitigation. FuelCell Energy’s platforms are capable of reducing the global environmental footprint of baseload power generation by providing environmentally responsible solutions for reliable electrical power, distributed hydrogen, electrolysis, long-duration hydrogen-based energy storage, carbon capture, microgrid applications, hot water, steam, and chilling. Our customer base includes utility companies, municipalities, universities, hospitals, government entities/military bases and a variety of industrial and commercial enterprises. Our leading geographic markets are currently the United States and South Korea, and we are pursuing opportunities in other countries around the world. Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial information. Accordingly, they do not contain all of the information and footnotes required by accounting principles generally accepted in the United States of America (“GAAP”) for complete financial statements. In the opinion of management, all normal and recurring adjustments necessary to fairly present the Company’s financial position and results of operations as of and for the three and six months ended April 30, 2021 and 2020 have been included. All intercompany accounts and transactions have been eliminated. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted. The balance sheet as of October 31, 2020 has been derived from the audited financial statements at that date, but it does not include all of the information and footnotes required by GAAP for complete financial statements. These financial statements should be read in conjunction with the Company’s financial statements and notes thereto for the fiscal year ended October 31, 2020, which are contained in the Company’s Annual Report on Form 10-K previously filed with the SEC. The results of operations for the interim periods presented are not necessarily indicative of results that may be expected for any other interim period or for the full fiscal year. Use of Estimates The preparation of financial statements and related disclosures in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Estimates are used in accounting for, among other things, revenue recognition, contract loss accruals, excess, slow-moving and obsolete inventories, product warranty accruals, loss accruals on service agreements, share-based compensation expense, allowance for doubtful accounts, depreciation and amortization, impairment of goodwill and in-process research and development intangible assets, impairment of long-lived assets (including project assets), lease liabilities and right-of-use (“ROU”) assets, and contingencies. Estimates and assumptions are reviewed periodically, and the effects of revisions are reflected in the consolidated financial statements in the period they are determined to be necessary. Due to the inherent uncertainty involved in making estimates, actual results in future periods may differ from those estimates. Liquidity Our principal sources of cash have been sales of our common stock through public equity offerings, proceeds from third party debt such as borrowings under our credit facilities, project financing and tax monetization transactions, proceeds from the sale of our projects as well as research and development and service and license agreements with third parties. We have utilized this cash to develop and construct power plants, perform research and development on Advanced Technologies, pay down existing outstanding indebtedness, and meet our other cash and liquidity needs. As of April 30, 2021, unrestricted cash and cash equivalents totaled $139.1 million compared to $149.9 million as of October 31, 2020. In December 2020, the Company closed an underwritten offering of 25.0 million shares of the Company’s common stock. Net proceeds to the Company were approximately $156.4 million after deducting underwriting discounts and commissions and other offering expenses. Proceeds from this offering have been utilized as follows: ● Extinguishment of Senior Secured Debt : On December 7, 2020, the Company paid $87.3 million to settle the outstanding principal, accrued but unpaid interest, prepayment premium, fees, costs and other expenses due and owing to the Orion Agent and the lenders under the Orion Facility and the Orion Credit Agreement (in each case as defined elsewhere herein) and related loan documents. Concurrently, the Orion Agent released all of the collateral from the liens granted under the security documents associated with the Orion Facility, which included the release of $11.2 million of restricted cash to the Company. ● Extinguishment of the Series 1 Preferred Shares : On December 17, 2020, the Company paid all amounts owed to Enbridge Inc. (“Enbridge”) under the Series 1 Preferred Shares (as defined elsewhere herein), totaling Cdn. $27.4 million, or approximately $21.5 million in U.S. dollars. Following such payment, Enbridge surrendered its shares in FCE Ltd. (as defined elsewhere herein) and the related Guarantee and January 2020 Letter Agreement (in each case, as defined elsewhere herein) were terminated. ● Working Capital: The remaining $47.5 million of proceeds from the offering was included in unrestricted cash and is being used to accelerate the development and commercialization of our solid oxide platform and for project development, project financing, debt service, working capital support and other general corporate purposes. In February 2021, the Company further reduced its debt by repaying the outstanding Paycheck Protection Program Promissory Note from Liberty Bank under the CARES Act totaling $6.5 million. We believe that our unrestricted cash and cash equivalents, expected receipts from our contracted backlog, and release of short-term restricted cash less expected disbursements over the next twelve months will be sufficient to allow the Company to meet its obligations for at least one year from the date of issuance of these financial statements. To date, we have not achieved profitable operations or sustained positive cash flow from operations. The Company’s future liquidity will depend on its ability to (i) timely complete current projects in process within budget, (ii) increase cash flows from its generation portfolio, including by meeting conditions required to timely commence operation of new projects, operating its generation portfolio in compliance with minimum performance guarantees and operating its generation portfolio in accordance with revenue expectations, (iii) obtain financing for project construction, (iv) obtain permanent financing for its projects once constructed, (v) increase order and contract volumes, which would lead to additional product sales, service agreements and generation revenues, (vi) obtain funding for and receive payment for research and development under current and future Advanced Technologies contracts, (vii) successfully commercialize its Advanced Technologies platforms, including its solid oxide platform, (viii) implement the product cost reductions necessary to achieve profitable operations, (ix) manage working capital and the Company’s unrestricted cash balance and (x) access the capital markets to raise funds through the sale of equity securities, convertible notes, and other equity-linked instruments. We are continually assessing different means by which to accelerate the Company’s growth, enter new markets, commercialize new products, and enable capacity expansion. Therefore, from time to time, the Company may consider and enter into agreements for one or more of the following: negotiated financial transactions, minority investments, collaborative ventures, license arrangements, joint ventures or other business transactions for the purpose(s) of geographic or manufacturing expansion and/or new product or technology development and commercialization. Our business model requires substantial outside financing arrangements and satisfaction of the conditions of such financing arrangements to construct and deploy our projects and facilitate the growth of our business. The Company expects to seek long-term debt and tax equity (e.g., sale-leaseback and partnership transactions) for its project asset portfolio as these projects commence commercial operations. The proceeds of any such financing, if obtained, may allow the Company to fund other projects. We may also seek to obtain additional financing in both the debt and equity markets in the future. If financing is not available to us on acceptable terms if and when needed, or on terms acceptable to us or our lenders, if we do not satisfy the conditions of our financing arrangements, if we spend more than the financing approved for projects, if project costs exceed an amount that the Company can finance, or if we do not generate sufficient revenues or obtain capital sufficient for our corporate needs, we may be required to reduce or slow planned spending, reduce staffing, sell assets, seek alternative financing and take other measures, any of which could have a material adverse effect on our financial condition and operations.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
Recent Accounting Pronouncements	Apr. 30, 2021
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	Note 2. Recent Accounting Pronouncements Recently Adopted Accounting Guidance In June 2016, the Financial Accounting Standards Board issued Accounting Standards Update No. 2016-13 (ASU 2016-13), “Measurement of Credit Losses (Topic 326) on Financial Instruments,” which replaces the existing incurred impairment model for trade receivables with an expected loss model which requires the use of forward-looking information to calculate expected credit loss estimates. The Company adopted ASU 2016-13 as of November 1, 2020, which had no impact on the Company’s Consolidated Financial Statements. Recent Accounting Guidance Not Yet Effective There is no recent accounting guidance not yet effective that is expected to have a material impact on the Company’s financial statements when adopted.

Revenue Recognition

Revenue Recognition	6 Months Ended
Revenue Recognition	Apr. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue Recognition	Note 3. Revenue Recognition Contract Balances Contract assets as of April 30, 2021 and October 31, 2020 were $17.5 million and $16.9 million, respectively. The contract assets relate to the Company’s rights to consideration for work performed but not billed. These amounts are included on a separate line item as Unbilled receivables, and balances expected to be billed later than one year from the balance sheet date are included within Other assets on the accompanying Consolidated Balance Sheets. The net change in contract assets represents amounts recognized as revenue offset by customer billings. Contract liabilities as of April 30, 2021 and October 31, 2020 were $44.2 million and $41.9 million, respectively. The contract liabilities relate to the advance billings to customers for services that will be recognized over time and in some instances for deferred revenue relating to license performance obligations that will be recognized at a future point in time. The Company has discontinued revenue recognition of the deferred license revenue related to the terminated POSCO Energy License Agreements (as defined elsewhere herein) given the pending arbitration, described in Part II, Item 1, “Legal Proceedings,” and will continue to evaluate this deferred revenue in future periods (for more information, refer to Note 18. “Commitments and Contingencies”). As of April 30, 2021, $22.2 million related to the terminated POSCO Energy License Agreements is included within Long-term deferred revenue on the accompanying Consolidated Balance Sheets. The net change in contract liabilities represents customer billings offset by revenue recognized. Remaining Performance Obligations Remaining performance obligations are the aggregate amount of total contract transaction price that is unsatisfied or partially unsatisfied. As of April 30, 2021, the Company’s total remaining performance obligations were: $141.4 million for service agreements, $22.2 million for license agreements and $45.0 million for Advanced Technologies contracts in the aggregate. Service revenue in periods in which there are no module exchanges is expected to be relatively consistent from period to period, whereas module exchanges will result in an increase in revenue when exchanges occur.

Accounts Receivable, Net and Un

Accounts Receivable, Net and Unbilled Receivables	6 Months Ended
Accounts Receivable, Net and Unbilled Receivables	Apr. 30, 2021
Receivables [Abstract]
Accounts Receivable, Net and Unbilled Receivables	Note 4. Accounts Receivable, Net and Unbilled Receivables Accounts receivable, net and Unbilled receivables as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Commercial Customers: Amount billed $ 10,183 $ 7,329 Unbilled receivables (1) 6,289 7,063 16,472 14,392 Advanced Technologies (including U.S. government (2) Amount billed 1,964 2,234 Unbilled receivables 1,371 978 3,335 3,212 Accounts receivable, net and unbilled receivables $ 19,807 $ 17,604 (1) Additional long-term unbilled receivables of $9.9 million and $8.9 million are included within “Other Assets” as of April 30, 2021 and October 31, 2020, respectively. (2) Total U.S. government accounts receivable, including unbilled receivables, outstanding as of April 30, 2021 and October 31, 2020 were $1.0 million and $1.1 million, respectively. We bill customers for power platform and power platform component sales based on certain contractual milestones being reached. We bill service agreements based on the contract price and billing terms of the contracts. Generally, our Advanced Technologies contracts are billed based on actual revenues recorded, typically in the subsequent month. Some Advanced Technologies contracts are billed based on contractual milestones or costs incurred. Unbilled receivables relate to revenue recognized on customer contracts that have not been billed. The Company had no allowance for doubtful accounts as of April 30, 2021 and October 31, 2020. Uncollectible accounts receivable are charged against the allowance for doubtful accounts when all collection efforts have failed and it is deemed unlikely that the amount will be recovered.

Inventories

Inventories	6 Months Ended
Inventories	Apr. 30, 2021
Inventory Disclosure [Abstract]
Inventories	Note 5. Inventories Inventories (short and long-term) as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Raw materials $ 27,075 $ 21,726 Work-in-process (1) 36,431 38,231 Inventories 63,506 59,957 Inventories - short-term (58,920) (50,971) Inventories - long-term (2) $ 4,586 $ 8,986 (1) Work-in-process includes the standard components of inventory used to build the typical modules or module components that are intended to be used in future project asset construction or power plant orders or for use under the Company’s service agreements. Included in work-in-process as of April 30, 2021 and October 31, 2020 was $22.2 million and $19.6 million, respectively, of completed standard components and modules. (2) Long-term inventory includes modules that are contractually required to be segregated for use as exchange modules for specific project assets. Raw materials consist mainly of various nickel powders and steels, various other components used in producing cell stacks and purchased components for balance of plant. Work-in-process inventory is comprised of material, labor, and overhead costs incurred to build fuel cell stacks and modules, which are subcomponents of a power platform. The Company incurred costs associated with excess plant capacity and manufacturing variances of $1.3 million and $2.7 million for the three months ended April 30, 2021 and 2020, respectively, and $3.4 million and $4.4 million for the six months ended April 30, 2021 and 2020, respectively, which were included within product cost of revenues on the Consolidated Statements of Operations and Comprehensive Loss.

Project Assets

Project Assets	6 Months Ended
Project Assets	Apr. 30, 2021
Project Assets [Abstract]
Project Assets	Note 6. Project Assets Project assets as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, Estimated 2021 2020 Useful Life Project Assets - Operating $ 125,464 $ 99,351 5-20 years Project Assets - Construction in progress 97,911 91,276 7-20 years 223,375 190,627 Accumulated depreciation (36,133) (28,818) Project Assets, net $ 187,242 $ 161,809 Project assets as of April 30, 2021 and October 31, 2020 included eight, completed, commissioned installations generating power with respect to which the Company has a power purchase agreement (“PPA”) with the end-user of power and site host or utility with an aggregate value of $89.3 million and $70.5 million as of April 30, 2021 and October 31, 2020, respectively. Certain of these assets are the subject of sale-leaseback arrangements with PNC Energy Capital, LLC (“PNC”) and Crestmark Equipment Finance (“Crestmark”). Project asset depreciation was approximately $3.3 million and $2.8 million for the three months ended April 30, 2021 and 2020, respectively, and $7.3 million and $5.8 million for the six months ended April 30, 2021 and 2020, respectively. Project assets as of April 30, 2021 and October 31, 2020 also include installations with carrying values of $97.9 million and $91.3 million, respectively, which are being developed and constructed by the Company in connection with projects for which we have entered into PPAs or projects for which we expect to secure PPAs or otherwise recover the asset value and which have not yet been placed in service. Of these totals, as of each of April 30, 2021 and October 31, 2020, approximately $4.8 million relates to projects for which we expect to secure long-term contracts and/or otherwise recover the asset value and which have not yet been placed in service. Project construction costs incurred for long-term project assets are reported as investing activities in the Consolidated Statements of Cash Flows. The proceeds received from the sale and subsequent leaseback of project assets are classified as “Cash flows from financing activities” within the Consolidated Statements of Cash Flows and are classified as a financing obligation within “Current portion of long-term debt” and “Long-term debt and other liabilities” on the Consolidated Balance Sheets (refer to Note 16. “Debt” for more information).

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
Goodwill and Intangible Assets	Apr. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note 7. Goodwill and Intangible Assets As of April 30, 2021 and October 31, 2020, the Company had goodwill of $4.1 million and intangible assets of $19.3 million and $20.0 million, respectively, that were recorded in connection with the Company’s 2012 acquisition of Versa Power Systems, Inc. (“Versa”) and the 2019 Bridgeport Fuel Cell Project acquisition. The Versa acquisition intangible asset is an indefinite-lived in-process research and development intangible asset for cumulative research and development efforts associated with the development of solid oxide fuel cell stationary power generation. Amortization expense for the Bridgeport Fuel Cell Project PPA asset for the three and six months ended April 30, 2021 was $0.3 million and $0.6 million, respectively, and for the three and six months ended April 30, 2020 was $0.3 million and $0.7 million, respectively. The following tables summarize the Company’s intangible assets as of April 30, 2021 and October 31, 2020 (in thousands): As of April 30, 2021 Gross Amount Accumulated Net Amount In-Process Research and Development $ 9,592 $ — $ 9,592 Bridgeport PPA 12,320 (2,594) 9,726 Total $ 21,912 $ (2,594) $ 19,318 As of October 31, 2020 Gross Amount Accumulated Net Amount In-Process Research and Development $ 9,592 $ — $ 9,592 Bridgeport PPA 12,320 (1,945) 10,375 Total $ 21,912 $ (1,945) $ 19,967

Other Current Assets

Other Current Assets	6 Months Ended
Other Current Assets	Apr. 30, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Other Current Assets	Note 8. Other Current Assets Other current assets as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Advance payments to vendors (1) $ 3,102 $ 1,954 Prepaid expenses and other (2) 7,215 4,352 Other current assets $ 10,317 $ 6,306 (1) Advance payments to vendors relate to payments for inventory purchases ahead of receipt. (2) Primarily relates to other prepaid vendor expenses including insurance expense.

Other Assets

Other Assets	6 Months Ended
Other Assets	Apr. 30, 2021
Other Assets Noncurrent [Abstract]
Other Assets	Note 9. Other Assets Other assets as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Long-term stack residual value (1) $ 702 $ 890 Long-term unbilled receivables (2) 9,881 8,856 Other (3) 5,943 5,593 Other assets $ 16,526 $ 15,339 (1) Relates to estimated residual value for module exchanges performed under the Company’s service agreements where the useful life extends beyond the contractual term of the service agreement and the Company obtains title for the module from the customer upon expiration or non-renewal of the service agreement. If the Company does not obtain rights to title from the customer, the full cost of the module is expensed at the time of the module exchange. (2) Represents unbilled receivables that relate to revenue recognized on customer contracts that will be billed in future periods in excess of 12 months from the balance sheet date. (3) The Company entered into an agreement with one of its customers on June 29, 2016 which includes payments for the purchase of the customer’s power platforms by the Company at the end of the term of the agreement. The payments are to be made in installments over the term of the agreement and the total amount paid as of each of April 30, 2021 and October 31, 2020 was $2.4 million. Also included within “Other” are long-term security deposits and prepaid withholding taxes on deferred revenue as of April 30, 2021 and October 31, 2020.

Accrued Liabilities

Accrued Liabilities	6 Months Ended
Accrued Liabilities	Apr. 30, 2021
Accrued Liabilities Current [Abstract]
Accrued Liabilities	Note 10. Accrued Liabilities Accrued liabilities as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Accrued payroll and employee benefits $ 3,256 $ 4,461 Accrued product warranty cost (1) 85 97 Accrued service agreement and PPA costs (2) 7,055 7,037 Accrued legal, taxes, professional and other 3,023 4,086 Accrued liabilities $ 13,419 $ 15,681 (1) The decrease in accrued product warranty cost represents a reduction related to actual warranty activity as contracts progress through the warranty period. Product warranty expense for the three months ended April 30, 2021 and 2020 was $6 thousand and $0.01 million, respectively, and for the six months ended April 30, 2021 and 2020 was $12 thousand and $0.03 million, respectively. (2) Accrued service agreement costs include loss accruals on service agreements of $5.5 million as of each of October 31, 2020 and April 30, 2021. The accruals for performance guarantees, including PPA performance guarantees was $1.6 million as of April 30, 2021, which reflects an increase from $1.4 million as of October 31, 2020.

Leases

Leases	6 Months Ended
Leases	Apr. 30, 2021
Leases [Abstract]
Leases	Note 11. Leases The Company enters into operating and finance lease agreements for the use of real estate, vehicles, information technology equipment, and certain other equipment. We determine if an arrangement contains a lease at inception, which is the date on which the terms of the contract are agreed to and the agreement creates enforceable rights and obligations. Operating leases are included in Operating lease right-of-use assets, net, Operating lease liabilities, and Long-term operating lease liabilities in the Company’s Consolidated Balance Sheets. Finance leases are not considered significant to the Company’s Consolidated Balance Sheets or Consolidated Statements of Operations and Comprehensive Loss. Finance lease right of use (“ROU”) assets at April 30, 2021 and October 31, 2020 of $0.1 million and $0.04 million, respectively, are included in Property, plant and equipment, net in the Company’s Consolidated Balance Sheets. Finance lease liabilities at April 30, 2021 and October 31, 2020 of $0.1 million and $0.04 million, respectively, are included in Current portion of long-term debt and Long-term debt and other liabilities in the Company’s Consolidated Balance Sheets. ROU assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the present value of the Company’s obligation to make lease payments arising from the lease over the lease term at the commencement date of the lease. As most of the Company’s leases do not provide an implicit rate, the Company estimated the incremental borrowing rate based on the information available at the date of adoption in determining the present value of lease payments and used the implicit rate when readily determinable. The Company determined incremental borrowing rates through market sources for secured borrowings including relevant industry rates. The Company’s operating lease ROU assets also include any lease pre-payments and exclude lease incentives. Certain of the Company’s leases include variable payments, which may vary based upon changes in facts or circumstances after the start of the lease. The Company excludes variable payments from lease ROU assets and lease liabilities, to the extent not considered in-substance fixed, and instead, expenses variable payments as incurred. Variable lease expense and lease expense for short term contracts are not material components of lease expense. The Company’s leases generally have remaining lease terms of 1 to 26 years, some of which include options to extend leases. The exercise of lease renewal options is at the Company’s sole discretion and the Company’s lease ROU assets and liabilities reflect only the options the Company is reasonably certain that it will exercise. We do not have leases with residual value guarantees or similar covenants. Operating lease expense for the three months ended April 30, 2021 and 2020 was $0.4 million and $0.1 million, respectively, and for the six months ended April 30, 2021 and 2020 was $0.8 million and $0.3 million, respectively. As of April 30, 2021, the weighted average remaining lease term (in years) was approximately 20 years and the weighted average discount rate was 7.8%. Lease payments made during the three months ended April 30, 2021 and 2020 were $0.3 million and $0.2 million, respectively, and during the six months ended April 30, 2021 and 2020 were $0.6 million and $0.5 million, respectively. Undiscounted maturities of operating lease and finance lease liabilities are as follows: Operating Finance Due Year 1 $ 1,303 $ 67 Due Year 2 1,369 52 Due Year 3 813 41 Due Year 4 734 — Due Year 5 734 — Thereafter 25,587 — Total undiscounted lease payments 30,540 160 Less imputed interest (21,475) (26) Total discounted lease payments $ 9,065 $ 134

Stockholders' Equity and Warran

Stockholders' Equity and Warrant Liabilities	6 Months Ended
Stockholders' Equity and Warrant Liabilities	Apr. 30, 2021
Equity [Abstract]
Stockholders' Equity and Warrant Liabilities	Note 12. Stockholders’ Equity and Warrant Liabilities Increase in Authorized Shares The Company obtained stockholder approval on April 8, 2021 at the Annual Meeting of Stockholders to increase the number of shares of common stock the Company is authorized to issue under the Company’s Certificate of Incorporation, as amended. The Company’s stockholders approved a 162,500,000 increase in the number of authorized shares of common stock. Accordingly, on April 8, 2021, the Company filed a Certificate of Amendment of the Certificate of Incorporation of the Company with the Delaware Secretary of State increasing the total number of authorized shares of common stock from 337,500,000 shares to 500,000,000 shares. December Common Stock Offering In December of 2020, the Company and Orion Energy Credit Opportunities Fund II, L.P., Orion Energy Credit Opportunities Fund II GPFA, L.P., Orion Energy Credit Opportunities Fund II PV, L.P., and Orion Energy Credit Opportunities FuelCell Co-Invest, L.P. (the lenders under the Credit Agreement among the Company, certain of its affiliates as guarantors, Orion Energy Partners Investment Agent, LLC (the “Orion Agent”) and such lenders (as amended, the “Orion Credit Agreement”)) (the “Selling Stockholders”) completed a public offering of the Company’s common stock. In connection with this public offering, the Company and the Selling Stockholders entered into an underwriting agreement pursuant to which (i) the Company agreed to issue and sell to the underwriters 19,822,219 shares of the Company’s common stock, plus up to 5,177,781 shares of common stock pursuant to an option to purchase additional shares, and (ii) the Selling Stockholders agreed to sell to the underwriters 14,696,320 shares of common stock, in each case at a price to the public of $6.50 per share. The underwriters exercised their option to purchase additional shares, resulting in the issuance and sale by the Company at the closing of the offering of a total of 25,000,000 shares of common stock. The offering closed on December 4, 2020. Gross proceeds from the sale of common stock by the Company in the offering were $162.5 million. The Company did not receive any proceeds from the sale of common stock in the offering by the Selling Stockholders. The Company and the Selling Stockholders paid underwriting discounts and commissions of $0.2275 per share, and net proceeds to the Company were approximately $156.4 million after deducting such underwriting discounts and commissions and other offering expenses. Warrants Orion Warrants In connection with the closing of the Orion Credit Agreement and the Company’s initial draw down under the Orion Credit Agreement of $14.5 million (the “Initial Funding”), on October 31, 2019, the Company issued warrants to the lenders under the Orion Credit Agreement to purchase up to a total of 6,000,000 shares of the Company’s common stock, at an exercise price of $0.310 per share (the “Initial Funding Warrants”). In addition, under the Orion Credit Agreement, on November 22, 2019, the date on which the Company made a second draw of $65.5 million under the Orion Credit Agreement (the “Second Funding”), the Company issued warrants to the lenders under the Orion Credit Agreement to purchase up to a total of 14,000,000 shares of the Company’s common stock, with an exercise price with respect to 8,000,000 of such shares of $0.242 per share and with an exercise price with respect to 6,000,000 of such shares of $0.62 per share (the “Second Funding Warrants”, and together with the Initial Funding Warrants, the “Orion Warrants”). During the three months ended January 31, 2020, the lenders exercised, on a cashless basis, Orion Warrants representing the right to purchase 12,000,000 shares of the Company’s common stock. Because these Orion Warrants were exercised on a cashless basis, the Company issued in the aggregate 9,396,320 shares of the Company’s common stock. The Orion Warrants that were converted were remeasured to fair value immediately preceding the conversion based upon volatility of 103.7%, a risk free rate of 1.81% and the Company’s common stock price of $2.29 on January 8, 2020, which resulted in a $23.7 million charge for the three months ended January 31, 2020. The revised estimated fair value of the converted Orion Warrants as of the date of conversion of $26.0 million was reclassified to Additional paid in capital. The remaining Orion Warrants as of January 31, 2020 were remeasured to estimated fair value based upon a volatility of 104.9%, a risk free rate of 1.45% and the Company’s common stock price at January 31, 2020 of $1.59 per share, which resulted in a charge for the three months ended January 31, 2020 of $10.5 million. The Company remeasured the remaining Orion Warrants again at April 30, 2020 based upon a volatility of 107.4%, a risk free rate of 0.57% and the Company’s common stock price at April 30, 2020 of $2.02 per share, which resulted in a charge for the three months ended April 30, 2020 of $3.4 million. During fiscal year 2020, the lenders exercised all of the Orion Warrants, except for Orion Warrants to purchase 2,700,000 shares of common stock. On December 7, 2020, all remaining Orion Warrants were exercised to purchase a total of 2,700,000 shares of the Company’s common stock for an aggregate exercise price of $653,400 (or $0.242 per share). The Orion Warrants that were converted on December 7, 2020 were remeasured to fair value immediately preceding the conversion based upon volatility of 117.02%, a risk free rate of 0.70% and the Company’s common stock price of $7.95 on December 4, 2020, which resulted in a $16.0 million charge for the three months ended January 31, 2021. The estimated fair value of the converted Orion Warrants as of the December 7, 2020 date of conversion of $21.2 million was reclassified to Additional paid in capital. Other Warrants On May 3, 2017, the Company completed an underwritten public offering that included the offering and sale of: (i) 1,000,000 shares of its common stock, and (ii) Series C warrants to purchase 1,000,000 shares of its common stock that have an exercise price of $19.20 per share and a term of five years. During the three and six months ended April 30, 2021, Series C warrants were exercised to purchase a total of 14,026 shares of the Company’s common stock resulting in cash proceeds to the Company of $0.3 million. The Series C warrants contain provisions regarding adjustments to their exercise price and the number of shares of common stock issuable upon exercise. The following table summarizes outstanding warrant activity during the six months ended April 30, 2021: Series C Warrants Orion Warrants Balance as of October 31, 2020 964,128 2,700,000 Warrants exercised (14,026) (2,700,000) Balance as of April 30, 2021 950,102 —

Redeemable Preferred Stock

Redeemable Preferred Stock	6 Months Ended
Redeemable Preferred Stock	Apr. 30, 2021
Preferred Stock [Abstract]
Redeemable Preferred Stock	Note 13. Redeemable Preferred Stock The Company is authorized to issue up to 250,000 shares of preferred stock, par value $0.01 per share, in one or more series, of which 105,875 shares were designated as 5% Series B Cumulative Convertible Perpetual Preferred Stock (“Series B Preferred Stock”) in March 2005. Series B Preferred Stock As of April 30, 2021, the Company had 105,875 shares of Series B Preferred Stock, with a liquidation preference of $1,000.00 per share, authorized for issuance. As of April 30, 2021 and October 31, 2020, there were 64,020 shares of Series B Preferred Stock issued and outstanding, with a carrying value of $59.9 million. Dividends of $0.8 million and $0.8 million were paid in cash during the three-month periods ended April 30, 2021 and 2020, respectively, and dividends of $1.6 million and $3.2 million were paid in cash during the six-month periods ended April 30, 2021 and 2020, respectively. A payment of $2.4 million made during the six-month period ended April 30, 2020 represented the dividends payable with respect to the May 15, 2019 and August 15, 2019 dividend dates and the dividends payable with respect to the November 15, 2019 dividend date that were declared on October 30, 2019. Class A Preferred Shares As of October 31, 2020, FCE FuelCell Energy, Ltd. (“FCE Ltd.”) had 1,000,000 Class A Preferred Shares (the “Series 1 Preferred Shares”) issued and outstanding, which were held by Enbridge Inc. (“Enbridge”). Dividends and return of capital payments were due quarterly based on calendar quarters. The Company made payments of Cdn. $0.3 million and $1.5 million during the three-month and six-month periods ended April 30, 2020, respectively. The Company’s payments made during the six-months ended April 30, 2020 included the payments which were not made previously for the calendar quarters ended on March 31, 2019, June 30, 2019 and September 30, 2019. The Company recorded interest expense, which reflects the amortization of the fair value discount of approximately Cdn. $0.7 million for the three months ended April 30, 2020 and Cdn. $0.6 million and Cdn. $1.3 million for the six months ended April 30, 2021 and 2020, respectively. There was no interest expense recorded for the three months ended April 30, 2021. As of October 31, 2020, the carrying value of the Series 1 Preferred Shares was Cdn. $25.6 million (U.S. $19.2 million) and was classified as a preferred stock obligation of a subsidiary on the Consolidated Balance Sheets. On January 20, 2020, the Company, FCE Ltd. and Enbridge entered into a letter agreement (the “January 2020 Letter Agreement”), pursuant to which they agreed to amend the articles of FCE Ltd. relating to and setting forth the terms of the Series 1 Preferred Shares to: (i) remove the provisions of the articles permitting or requiring the issuance of shares of the Company’s common stock in exchange for the Series 1 Preferred Shares or as payment of amounts due to the holders of the Series 1 Preferred Shares, (ii) remove certain provisions of the articles relating to the redemption of the Series 1 Preferred Shares, (iii) increase the annual dividend rate, commencing on January 1, 2020, to 15%, (iv) extend the final payment date for all accrued and unpaid dividends and all return of capital payments (i.e., payments of the principal redemption price) from December 31, 2020 to December 31, 2021, (v) clarify when dividend and return of capital payments are to be made in the future and extend the quarterly dividend and return of capital payments through December 31, 2021 (which were previously to be paid each quarter through December 31, 2020), (vi) remove certain terms and provisions of the articles that were no longer applicable, and (vii) make other conforming changes to the articles. In addition, the parties agreed to amend the Company’s guarantee in favor of Enbridge (the “Guarantee”) as necessary or as the parties may mutually agree, in either case, in order to be consistent with such amended articles and to maintain the Company’s guarantee of FCE Ltd.’s obligations under the Series 1 Preferred Shares. The articles of FCE Ltd. were amended and filed in accordance with the provisions of the January 2020 Letter Agreement on March 26, 2020. Under the terms of the January 2020 Letter Agreement, the Company was still required to make (i) annual dividend payments of Cdn. $500,000 and (ii) annual return of capital payments of Cdn. $750,000. Dividend and return of capital payments were to be made on a quarterly basis and were scheduled to end on December 31, 2021 unless these obligations were satisfied in advance of such date. The amendment to the Series 1 Preferred Shares resulted in an extinguishment of the prior Series 1 Preferred Shares for accounting purposes. A revised fair value was estimated using a discounted cash flow model resulting in a revised carrying value being recorded for the amended Series 1 Preferred Shares which resulted in a loss of Cdn. $0.2 million (U.S. $0.2 million) recorded in Other (expense) income, net on the Consolidated Statements of Operations and Comprehensive Loss during the three months ended January 31, 2020. Prior to the amendment, the Company bifurcated embedded derivatives related to the conversion feature and a variable dividend feature. As a result of the January 2020 Letter Agreement, both features were removed from the Series 1 Preferred Shares which resulted in the Company recognizing a gain of U.S. $0.6 million related to the extinguishment of the embedded derivatives during the six months ended April 30, 2020. In December 2020, the Company, FCE Ltd., and Enbridge entered into a payoff letter, pursuant to which the Company paid all amounts owed to Enbridge under the terms of the Series 1 Preferred Shares. As of the date of the payoff letter, the amount owed to Enbridge under the Series 1 Preferred Shares totaled Cdn. $27.4 million, which included Cdn. $4.3 million of principal and Cdn. $23.1 million of accrued dividends. On December 18, 2020, the Company remitted payment totaling Cdn. $27.4 million, or approximately U.S. $21.5 million, to Enbridge. Upon making the payment, the Company recorded a loss on extinguishment for the Series 1 Preferred Shares of $0.9 million. Concurrent with receipt of the payment from the Company, Enbridge surrendered its Series 1 Preferred Shares in FCE Ltd., and the Guarantee and the January 2020 Letter Agreement were terminated. All obligations related to the Series 1 Preferred Shares were extinguished upon payment.

Loss Per Share

Loss Per Share	6 Months Ended
Loss Per Share	Apr. 30, 2021
Earnings Per Share [Abstract]
Loss Per Share	Note 14. Loss Per Share The calculation of basic and diluted loss per share was as follows: Three Months Ended April 30, Six Months Ended April 30, 2021 2020 2021 2020 Numerator Net loss $ (18,917) $ (14,769) $ (64,877) $ (54,920) Series B preferred stock dividends (800) (800) (1,600) (1,731) Net loss attributable to common stockholders $ (19,717) $ (15,569) $ (66,477) $ (56,651) Denominator Weighted average basic common shares 322,500,592 211,000,091 317,219,129 206,560,031 Effect of dilutive securities (1) — — — — Weighted average diluted common shares 322,500,592 211,000,091 317,219,129 206,560,031 Basic loss per share $ (0.06) $ (0.07) $ (0.21) $ (0.27) Diluted loss per share (1) $ (0.06) $ (0.07) $ (0.21) $ (0.27) (1) Due to the net loss to common stockholders in each of the periods presented above, diluted loss per share was computed without consideration to potentially dilutive instruments as their inclusion would have been anti-dilutive. As of April 30, 2021 and 2020, potentially dilutive securities excluded from the diluted loss per share calculation are as follows: April 30, April 30, 2021 2020 Orion Warrants — 8,000,000 May 2017 Offering - Series C Warrants 950,102 964,128 Outstanding options to purchase common stock 22,388 23,891 Unvested Restricted Stock Awards — 2,091 Unvested Restricted Stock Units 2,817,137 63,267 5% Series B Cumulative Convertible Preferred Stock 37,837 37,837 Total potentially dilutive securities 3,827,464 9,091,214

Restricted Cash

Restricted Cash	6 Months Ended
Restricted Cash	Apr. 30, 2021
Restricted Cash And Investments [Abstract]
Restricted Cash	Note 15. Restricted Cash As of April 30, 2021 and October 31, 2020, there was $32.1 million and $42.2 million, respectively, of restricted cash and cash equivalents pledged as performance security, reserved for future debt service requirements, reserved for letters of credit for certain banking requirements and contracts, and reserved to pay down the Orion Facility or be redeployed into other project financing at the option of the Orion Agent and the lenders under the Orion Facility. Refer to Note 16. “Debt” for additional information on the release of the restricted cash under the Orion Facility. The allocation of restricted cash is as follows (in thousands): April 30, October 31, 2021 2020 Cash Restricted for Outstanding Letters of Credit (1) $ 6,478 $ 6,543 Cash Restricted for PNC Sale-Leaseback Transactions 14,989 15,125 Cash Restricted for Crestmark Sale-Leaseback Transaction 432 431 Bridgeport Fuel Cell Park Project Debt Service and Performance Reserves 9,668 7,549 Orion Facility - Performance Reserve (2) — 5,000 Orion Facility - Module and Debt Service Reserves (3) — 1,950 Orion Facility - Project Proceeds Account (4) — 4,243 Other 529 1,344 Total Restricted Cash 32,096 42,185 Restricted Cash and Cash Equivalents - Short-Term (5) (17,427) (9,233) Restricted Cash and Cash Equivalents - Long-Term $ 14,669 $ 32,952 (1) Letters of credit outstanding as of April 30, 2021 expire on various dates through August 2028. (2) Short-term reserve that was related to certain project construction and financing milestones. (3) Long-term reserve that was to be used primarily to fund future module exchanges for operating projects falling under the collateral pool (CCSU and Triangle Street) under the Orion Facility. (4) Reserve that was related to proceeds received from project refinancing that was to be used to pay-down the Orion Facility unless redeployed into other project financing (at the option of the Orion Agent and the lenders under the Orion Facility). (5) Short-term restricted cash and cash equivalents are amounts expected to be released and categorized as unrestricted cash within twelve months of the balance sheet date.

Debt

Debt	6 Months Ended
Debt	Apr. 30, 2021
Debt Disclosure [Abstract]
Debt	Note 16. Debt Debt as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Orion Energy Partners Credit Facility $ — $ 80,000 Connecticut Green Bank Loan 4,800 4,800 Connecticut Green Bank Loan (Bridgeport Fuel Cell Project) 4,699 5,065 Liberty Bank Term Loan Agreement (Bridgeport Fuel Cell Project) 8,507 9,549 Fifth Third Bank Term Loan Agreement (Bridgeport Fuel Cell Project) 8,507 9,549 Finance obligation for sale-leaseback transactions 48,633 49,274 State of Connecticut Loan 9,041 9,454 Liberty Bank Promissory Note (PPP Note) — 6,515 Finance lease obligations 134 38 Deferred finance costs (1,413) (3,737) Unamortized debt discount — (5,152) Total debt and financing obligations $ 82,908 $ 165,355 Current portion of long-term debt and financing obligations (8,575) (21,366) Long-term debt and financing obligations $ 74,333 $ 143,989 Orion Energy Partners Investment Agent, LLC Credit Agreement On November 30, 2020, the Company, its subsidiary guarantors, and the Orion Agent entered into a payoff letter with respect to the Orion Credit Agreement (the “Orion Payoff Letter”). Pursuant to the Orion Payoff Letter, on December 7, 2020, the Company paid a total of $87.3 million to the Orion Agent, representing the outstanding principal, accrued but unpaid interest, prepayment premium, fees, costs and other expenses due and owing under the Orion Facility and the Orion Credit Agreement and related loan documents, in full repayment of the Company’s outstanding indebtedness under the Orion Facility and the Orion Credit Agreement and related loan documents. In accordance with the Orion Payoff Letter, the aggregate prepayment premium set forth in the Orion Credit Agreement was reduced from approximately $14.9 million to $4.0 million and the Orion Agent, on behalf of itself and the lenders, agreed that any portion of the prepayment premium that would otherwise be required to be paid pursuant to the Orion Credit Agreement in excess of $4.0 million was waived by the Orion Agent and the lenders. The Company expensed the remaining deferred finance costs and debt discount of $7.1 million. The Company has classified the $4.0 million prepayment premium and the deferred finance costs and debt discount expense as Loss on extinguishment of debt on the Consolidated Statements of Operations and Comprehensive Loss. Concurrently with the Orion Agent’s receipt of full payment pursuant to the Orion Payoff Letter, the Orion Agent released all of the collateral from the liens granted under the security documents associated with the Orion Facility (which included the release of $11.2 million of restricted cash to the Company, which became unrestricted cash), and the Company and its subsidiaries were unconditionally released from their respective obligations under the Orion Credit Agreement (and related loan documents) and the Orion Facility without further action. With the termination of the Orion Facility and the Orion Credit Agreement and related loan documents, the lenders no longer have the right to appoint representatives to attend the Company’s Board of Director meetings as observers. Liberty Bank Promissory Note On April 20, 2020, the Company entered into the PPP Note (as defined elsewhere herein), dated April 16, 2020, evidencing a loan to the Company from Liberty Bank under the CARES Act (as defined elsewhere herein), administered by the U.S. Small Business Administration. Pursuant to the PPP Note, the Company received total loan proceeds of approximately $6.5 million on April 24, 2020 (the “PPP Loan”). As required by the Orion Agent and its affiliated lenders (collectively, “Orion”) under the Company’s (now former) senior secured credit facility, the Company applied for forgiveness of the PPP Loan in October 2020. However, with the repayment in full of all amounts owed to Orion in December 2020, the Company was no longer required to pursue forgiveness of the PPP Loan. Additionally, since the time of the application for forgiveness, the Company’s financial circumstances changed substantially, such that the Company was no longer in need of forgiveness of the PPP Loan. Accordingly, on February 11, 2021, the Company withdrew its application for forgiveness and repaid all amounts outstanding under the PPP Note.

Benefit Plans

Benefit Plans	6 Months Ended
Benefit Plans	Apr. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Benefit Plans	Note 17. Benefit Plans We have stockholder approved equity incentive plans, a stockholder approved Employee Stock Purchase Plan and an employee tax-deferred savings plan. During the six months ended April 30, 2021, the Company approved a sub-plan to its 2018 Omnibus Incentive Plan, as amended and restated, which is described in more detail below. 2018 Omnibus Incentive Plan The Company’s 2018 Omnibus Incentive Plan (as amended and restated from time to time, the “2018 Incentive Plan”) authorizes grants of stock options, stock appreciation rights (“SARs”), restricted stock awards (“RSAs”), restricted stock units (“RSUs”), performance shares, performance units and incentive awards to employees, directors, consultants and advisors. Stock options, RSAs and SARs have restrictions as to transferability. Stock option exercise prices are fixed by the Company’s Board of Directors but shall not be less than the fair market value of our common stock on the date of the grant. SARs may be granted in conjunction with stock options. On November 24, 2020, the Company’s Board of Directors approved a Long Term Incentive Plan (the “LTI Plan”) as a sub-plan consisting of awards made under the 2018 Incentive Plan. The participants in the LTI Plan are members of senior management and include the Company’s named executive officers (as identified in the definitive proxy statement filed by the Company on February 19, 2021). The LTI Plan consists of three award components: (1) relative total shareholder return (“TSR”) performance units, (2) absolute TSR performance units, and (3) time-vesting restricted stock units. The performance units granted during the three months ended January 31, 2021 will be earned over the performance period ending on October 31, 2023, but will remain subject to a continued service-based vesting requirement until the third anniversary of the date of grant. The performance measure for the relative TSR performance units is the TSR of the Company relative to the TSR of the Russell 2000 from November 1, 2020 through October 31, 2023. The performance measure for the absolute TSR performance units is an increase in the Company’s stock price during the performance period of November 1, 2020 through October 31, 2023. The time-vesting RSUs granted during the three months ended January 31, 2021 will vest at a rate of one-third of the total number of RSUs on each of the first three anniversaries of the date of grant. None of the awards granted as part of the LTI Plan include any dividend equivalent or other stockholder rights. To the extent the awards are earned, they may be settled in shares or cash of an equivalent value at the Company’s option. On November 24, 2020, 848,078 RSUs were awarded under the LTI Plan, which include 551,252 performance units and 296,826 time-based units. Should the Company’s share price achieve the 200% performance level, awardees will receive up to 551,252 additional RSUs. The performance units were valued based on a Monte-Carlo Simulation, and the estimated fair value of the 275,626 relative TSR performance units are $14.41 per share and the estimated fair value of the 275,626 absolute TSR performance units are $15.36 per share. The performance units and time-based units will be expensed over the three-year service period. On April 8, 2021, the Company’s stockholders approved an amendment and restatement of the 2018 Incentive Plan to authorize the Company to issue up to 8,000,000 additional shares of the Company’s common stock. Following the approval of the amendment and restatement, the Company has the authority to issue a total of 12,333,333 shares of the Company’s common stock. Share-based compensation was reflected in the Consolidated Statements of Operations and Comprehensive Loss as follows (in thousands): Three months Ended April 30, Six months Ended April 30, 2021 2020 2021 2020 Cost of revenues $ 141 $ 105 $ 318 $ 222 General and administrative expense 1,054 242 2,237 581 Research and development expense 31 14 63 35 $ 1,226 $ 361 $ 2,618 $ 838 Restricted Stock Awards and Restricted Stock Units Including Performance Based Awards The following table summarizes our RSA and RSU activity for the six months ended April 30, 2021: Restricted Stock Awards and Units Shares Weighted-Average Fair Value Outstanding as of October 31, 2020 2,067,140 $ 5.06 Granted - performance units 551,252 14.89 Granted - time-vesting restricted stock units 296,826 3.28 Vested (221) 20.40 Outstanding as of January 31, 2021 2,914,997 $ 5.46 Granted - time-vesting restricted stock units 37,550 11.05 Vested (81,878) 13.13 Forfeited (53,532) 10.86 Outstanding as of April 30, 2021 2,817,137 $ 5.24

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Apr. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 18. Commitments and Contingencies Service Agreements Under the provisions of its service agreements, the Company provides services to maintain, monitor, and repair customer power plants to meet minimum operating levels. Under the terms of such service agreements, the particular power plant must meet a minimum operating output during defined periods of the term. If minimum output falls below the contract requirement, the Company may be subject to performance penalties and/or may be required to repair or replace the customer’s fuel cell module(s). Power Purchase Agreements Under the terms of the Company’s PPAs, customers agree to purchase power from the Company’s fuel cell power plants at negotiated rates. Electricity rates are generally a function of the customers’ current and estimated future electricity pricing available from the grid. As owner or lessee of the power plants, the Company is responsible for all operating costs necessary to maintain, monitor and repair the power plants. Under certain agreements, the Company is also responsible for procuring fuel, generally natural gas or biogas, to run the power plants. In addition, under the terms of some of the PPAs, the Company may be subject to a performance penalty if the Company does not meet certain performance requirements. Other As of April 30, 2021, the Company had unconditional purchase commitments aggregating $73.9 million, for materials, supplies and services in the normal course of business. Legal Proceedings POSCO Energy Matters From approximately 2007 through 2015, we relied on POSCO Energy Co., Ltd. (“POSCO Energy”) to develop and grow the South Korean and Asian markets for our products and services. We received upfront license payments and were entitled to receive royalty income from POSCO Energy pursuant to certain manufacturing and technology transfer agreements, including the Alliance Agreement dated February 7, 2007 (and the amendments thereto), the Technology Transfer, License and Distribution Agreement dated February 7, 2007 (and the amendments thereto), the Stack Technology Transfer and License Agreement dated October 27, 2009 (and the amendments thereto), and the Cell Technology Transfer and License Agreement dated October 31, 2012 (and the amendments thereto), which are collectively referred to herein as the “License Agreements.” The License Agreements provided POSCO Energy with the exclusive technology rights to manufacture, sell, distribute and service our SureSource 300, SureSource 1500 and SureSource 3000 fuel cell technology in the South Korean and broader Asian markets. Due to certain actions and inactions of POSCO Energy, the Company has not realized any new material revenues, royalties or new projects developed by POSCO Energy since late 2015. In November 2019, POSCO Energy spun-off its fuel cell business into a new entity, Korea Fuel Cell Co., Ltd. (“KFC”), without the Company’s consent. As part of the spin-off, POSCO Energy transferred manufacturing and service rights under the License Agreements to KFC, but retained distribution rights and severed its own liability under the License Agreements. The Company formally objected to POSCO Energy’s spin-off, and POSCO Energy posted a bond to secure any liabilities to the Company arising out of the spin-off. In September 2020, the Korean Electricity Regulatory Committee found that POSCO Energy’s spin-off of the fuel cell business to KFC may have been done in violation of South Korean law. On February 19, 2020, the Company notified POSCO Energy in writing that it was in material breach of the License Agreements by (i) its actions in connection with the spin-off of the fuel cell business to KFC, (ii) its suspension of performance through its cessation of all sales activities since late 2015 and its abandonment of its fuel cell business in Asia, and (iii) its disclosure of material nonpublic information to third parties and its public pronouncements about the fuel cell business on television and in print media that have caused reputational damage to the fuel cell business, the Company and its products. The Company also notified POSCO Energy that, under the terms of the License Agreements, it had 60 days to fully cure its breaches to the Company’s satisfaction and that failure to so cure would lead to termination of the License Agreements. Further, on March 27, 2020, the Company notified POSCO Energy of additional instances of its material breach of the License Agreements based on POSCO Energy’s failure to pay royalties required to be paid in connection with certain module exchanges. On April 27, 2020, POSCO Energy initiated a series of three arbitration demands against the Company at the International Court of Arbitration of the International Chamber of Commerce seated in Singapore alleging certain warranty defects in a sub-megawatt conditioning facility at its facility in Pohang, South Korea and seeking combined damages of approximately $3.3 million. Prior to filing the arbitrations, POSCO Energy obtained provisional attachments from the Seoul Central District Court attaching certain revenues owed to the Company by Korea Southern Power Company (“KOSPO”) as part of such warranty claims, which has delayed receipt of certain payments owed to the Company. POSCO Energy subsequently sought additional provisional attachments on KOSPO revenues from the Seoul Central District Court based on unspecified warranty claims not yet filed in an additional amount of approximately $7 million, and additional provisional attachments on KOSPO revenues from the Seoul Central District Court based on its alleged counterclaims in the license termination arbitration described below in an additional amount of approximately $110 million. As of April 30, 2021, outstanding accounts receivable due from KOSPO were $8.0 million. POSCO Energy posted a bond in the amount of $46 million to secure any damages to the Company resulting from the attachments. On June 28, 2020, the Company terminated the License Agreements with POSCO Energy and filed a demand for arbitration against POSCO Energy and KFC in the International Court of Arbitration of the International Chamber of Commerce based on POSCO Energy’s (i) failure to exercise commercially reasonable efforts to sell the Company’s technology in the South Korean and Asian markets, (ii) disclosure of the Company’s proprietary information to third parties, (iii) attack on the Company’s stock price and (iv) spin-off of POSCO Energy’s fuel cell business into KFC without the Company’s consent. The Company has requested that the arbitral tribunal (a) confirm through declaration that POSCO Energy’s exclusive license to market the Company’s technology and products in South Korea and Asia is null and void as a result of the breaches of the License Agreements and that the Company has the right to pursue direct sales in these markets, (b) order POSCO Energy and KFC to compensate the Company for losses and damages suffered in the amount of more than $200 million, and (c) order POSCO Energy and KFC to pay the Company’s arbitration costs, including counsel fees and expenses. The Company has retained outside counsel on a contingency basis to pursue its claims, and outside counsel has entered into an agreement with a litigation finance provider to fund the legal fees and expenses of the arbitration. In October 2020, POSCO Energy filed a counterclaim in the arbitration (x) seeking approximately $880 million in damages based on allegations that the Company misrepresented the capabilities of its fuel cell technology to induce POSCO Energy to enter into the License Agreements and failed to turn over know-how sufficient for POSCO Energy to successfully operate its business; (y) seeking a declaration that the License Agreements remain in full force and effect and requesting the arbitral tribunal enjoin the Company from interfering in POSCO Energy’s exclusive rights under the License Agreements and (z) seeking an order that the Company pay POSCO Energy’s arbitration costs, including counsel fees and expenses. The Company has discontinued revenue recognition of the deferred license revenue related to the terminated License Agreements given the pending arbitration and will continue to evaluate this deferred revenue in future periods. On August 28, 2020, POSCO Energy filed a complaint in the Court of Chancery of the State of Delaware (the “Court”) purportedly seeking to enforce its rights as a stockholder of the Company to inspect and make copies and extracts of certain books and records of the Company and/or the Company’s subsidiaries pursuant to Section 220 of the Delaware General Corporation Law and/or Delaware common law. POSCO Energy alleges that it is seeking to inspect these documents for a proper purpose reasonably related to its interests as a stockholder of the Company, including investigating whether the Company’s Board of Directors and its management breached their fiduciary duties of loyalty, due care, and good faith. POSCO Energy seeks an order of the Court permitting POSCO Energy to inspect and copy the demanded books and records, awarding POSCO Energy reasonable costs and expenses, including reasonable attorney’s fees incurred in connection with the matter, and granting such other and further relief as the Court deems just and proper. On September 14, 2020, POSCO Energy filed a complaint in the United States District Court for the Southern District of New York alleging that the Company delayed the removal of restrictive legends on certain share certificates held by POSCO Energy in 2018, thus precluding POSCO Energy from selling the shares and resulting in claimed losses in excess of $1 million. The Company does not believe that any of the arbitrations or legal proceedings brought against the Company by POSCO Energy are for a proper purpose. Further, the Company believes that all such arbitrations and legal proceedings are in fact simply fulfillment of POSCO Energy’s prior threats to file a series of actions against the Company and are attempts to obtain leverage over the Company and, in certain proceedings, gain advantage in the pending arbitration filed by the Company against POSCO Energy. The Company will vigorously defend itself against POSCO Energy’s claims in all forums and believes it will be apparent at the conclusion of each matter that each action was filed for an improper purpose. Other Legal Proceedings From time to time, the Company is involved in other legal proceedings, including, but not limited to, regulatory proceedings, claims, mediations, arbitrations and litigation, arising out of the ordinary course of its business (“Other Legal Proceedings”). Although the Company cannot assure the outcome of such Other Legal Proceedings, management presently believes that the result of such Other Legal Proceedings, either individually, or in the aggregate, will not have a material adverse effect on the Company’s consolidated financial statements, and no material amounts have been accrued in the Company’s consolidated financial statements with respect to these matters.

Nature of Business and Basis _2

Nature of Business and Basis of Presentation (Policies)	6 Months Ended
Nature of Business and Basis of Presentation (Policies)	Apr. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial information. Accordingly, they do not contain all of the information and footnotes required by accounting principles generally accepted in the United States of America (“GAAP”) for complete financial statements. In the opinion of management, all normal and recurring adjustments necessary to fairly present the Company’s financial position and results of operations as of and for the three and six months ended April 30, 2021 and 2020 have been included. All intercompany accounts and transactions have been eliminated. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted. The balance sheet as of October 31, 2020 has been derived from the audited financial statements at that date, but it does not include all of the information and footnotes required by GAAP for complete financial statements. These financial statements should be read in conjunction with the Company’s financial statements and notes thereto for the fiscal year ended October 31, 2020, which are contained in the Company’s Annual Report on Form 10-K previously filed with the SEC. The results of operations for the interim periods presented are not necessarily indicative of results that may be expected for any other interim period or for the full fiscal year.
Use of Estimates	Use of Estimates The preparation of financial statements and related disclosures in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Estimates are used in accounting for, among other things, revenue recognition, contract loss accruals, excess, slow-moving and obsolete inventories, product warranty accruals, loss accruals on service agreements, share-based compensation expense, allowance for doubtful accounts, depreciation and amortization, impairment of goodwill and in-process research and development intangible assets, impairment of long-lived assets (including project assets), lease liabilities and right-of-use (“ROU”) assets, and contingencies. Estimates and assumptions are reviewed periodically, and the effects of revisions are reflected in the consolidated financial statements in the period they are determined to be necessary. Due to the inherent uncertainty involved in making estimates, actual results in future periods may differ from those estimates.
Liquidity	Liquidity Our principal sources of cash have been sales of our common stock through public equity offerings, proceeds from third party debt such as borrowings under our credit facilities, project financing and tax monetization transactions, proceeds from the sale of our projects as well as research and development and service and license agreements with third parties. We have utilized this cash to develop and construct power plants, perform research and development on Advanced Technologies, pay down existing outstanding indebtedness, and meet our other cash and liquidity needs. As of April 30, 2021, unrestricted cash and cash equivalents totaled $139.1 million compared to $149.9 million as of October 31, 2020. In December 2020, the Company closed an underwritten offering of 25.0 million shares of the Company’s common stock. Net proceeds to the Company were approximately $156.4 million after deducting underwriting discounts and commissions and other offering expenses. Proceeds from this offering have been utilized as follows: ● Extinguishment of Senior Secured Debt : On December 7, 2020, the Company paid $87.3 million to settle the outstanding principal, accrued but unpaid interest, prepayment premium, fees, costs and other expenses due and owing to the Orion Agent and the lenders under the Orion Facility and the Orion Credit Agreement (in each case as defined elsewhere herein) and related loan documents. Concurrently, the Orion Agent released all of the collateral from the liens granted under the security documents associated with the Orion Facility, which included the release of $11.2 million of restricted cash to the Company. ● Extinguishment of the Series 1 Preferred Shares : On December 17, 2020, the Company paid all amounts owed to Enbridge Inc. (“Enbridge”) under the Series 1 Preferred Shares (as defined elsewhere herein), totaling Cdn. $27.4 million, or approximately $21.5 million in U.S. dollars. Following such payment, Enbridge surrendered its shares in FCE Ltd. (as defined elsewhere herein) and the related Guarantee and January 2020 Letter Agreement (in each case, as defined elsewhere herein) were terminated. ● Working Capital: The remaining $47.5 million of proceeds from the offering was included in unrestricted cash and is being used to accelerate the development and commercialization of our solid oxide platform and for project development, project financing, debt service, working capital support and other general corporate purposes. In February 2021, the Company further reduced its debt by repaying the outstanding Paycheck Protection Program Promissory Note from Liberty Bank under the CARES Act totaling $6.5 million. We believe that our unrestricted cash and cash equivalents, expected receipts from our contracted backlog, and release of short-term restricted cash less expected disbursements over the next twelve months will be sufficient to allow the Company to meet its obligations for at least one year from the date of issuance of these financial statements. To date, we have not achieved profitable operations or sustained positive cash flow from operations. The Company’s future liquidity will depend on its ability to (i) timely complete current projects in process within budget, (ii) increase cash flows from its generation portfolio, including by meeting conditions required to timely commence operation of new projects, operating its generation portfolio in compliance with minimum performance guarantees and operating its generation portfolio in accordance with revenue expectations, (iii) obtain financing for project construction, (iv) obtain permanent financing for its projects once constructed, (v) increase order and contract volumes, which would lead to additional product sales, service agreements and generation revenues, (vi) obtain funding for and receive payment for research and development under current and future Advanced Technologies contracts, (vii) successfully commercialize its Advanced Technologies platforms, including its solid oxide platform, (viii) implement the product cost reductions necessary to achieve profitable operations, (ix) manage working capital and the Company’s unrestricted cash balance and (x) access the capital markets to raise funds through the sale of equity securities, convertible notes, and other equity-linked instruments. We are continually assessing different means by which to accelerate the Company’s growth, enter new markets, commercialize new products, and enable capacity expansion. Therefore, from time to time, the Company may consider and enter into agreements for one or more of the following: negotiated financial transactions, minority investments, collaborative ventures, license arrangements, joint ventures or other business transactions for the purpose(s) of geographic or manufacturing expansion and/or new product or technology development and commercialization. Our business model requires substantial outside financing arrangements and satisfaction of the conditions of such financing arrangements to construct and deploy our projects and facilitate the growth of our business. The Company expects to seek long-term debt and tax equity (e.g., sale-leaseback and partnership transactions) for its project asset portfolio as these projects commence commercial operations. The proceeds of any such financing, if obtained, may allow the Company to fund other projects. We may also seek to obtain additional financing in both the debt and equity markets in the future. If financing is not available to us on acceptable terms if and when needed, or on terms acceptable to us or our lenders, if we do not satisfy the conditions of our financing arrangements, if we spend more than the financing approved for projects, if project costs exceed an amount that the Company can finance, or if we do not generate sufficient revenues or obtain capital sufficient for our corporate needs, we may be required to reduce or slow planned spending, reduce staffing, sell assets, seek alternative financing and take other measures, any of which could have a material adverse effect on our financial condition and operations.
Recently Adopted Accounting Guidance and Recent Accounting Guidance Not Yet Effective	Recently Adopted Accounting Guidance In June 2016, the Financial Accounting Standards Board issued Accounting Standards Update No. 2016-13 (ASU 2016-13), “Measurement of Credit Losses (Topic 326) on Financial Instruments,” which replaces the existing incurred impairment model for trade receivables with an expected loss model which requires the use of forward-looking information to calculate expected credit loss estimates. The Company adopted ASU 2016-13 as of November 1, 2020, which had no impact on the Company’s Consolidated Financial Statements. Recent Accounting Guidance Not Yet Effective There is no recent accounting guidance not yet effective that is expected to have a material impact on the Company’s financial statements when adopted.

Accounts Receivable, Net and _2

Accounts Receivable, Net and Unbilled Receivables (Tables)	6 Months Ended
Accounts Receivable, Net and Unbilled Receivables (Tables)	Apr. 30, 2021
Receivables [Abstract]
Schedule of Accounts Receivable, Net and Unbilled Receivables	Accounts receivable, net and Unbilled receivables as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Commercial Customers: Amount billed $ 10,183 $ 7,329 Unbilled receivables (1) 6,289 7,063 16,472 14,392 Advanced Technologies (including U.S. government (2) Amount billed 1,964 2,234 Unbilled receivables 1,371 978 3,335 3,212 Accounts receivable, net and unbilled receivables $ 19,807 $ 17,604 (1) Additional long-term unbilled receivables of $9.9 million and $8.9 million are included within “Other Assets” as of April 30, 2021 and October 31, 2020, respectively. (2) Total U.S. government accounts receivable, including unbilled receivables, outstanding as of April 30, 2021 and October 31, 2020 were $1.0 million and $1.1 million, respectively.

Inventories (Tables)

Inventories (Tables)	6 Months Ended
Inventories (Tables)	Apr. 30, 2021
Inventory Disclosure [Abstract]
Components of Inventories	Inventories (short and long-term) as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Raw materials $ 27,075 $ 21,726 Work-in-process (1) 36,431 38,231 Inventories 63,506 59,957 Inventories - short-term (58,920) (50,971) Inventories - long-term (2) $ 4,586 $ 8,986 (1) Work-in-process includes the standard components of inventory used to build the typical modules or module components that are intended to be used in future project asset construction or power plant orders or for use under the Company’s service agreements. Included in work-in-process as of April 30, 2021 and October 31, 2020 was $22.2 million and $19.6 million, respectively, of completed standard components and modules. (2) Long-term inventory includes modules that are contractually required to be segregated for use as exchange modules for specific project assets.

Project Assets (Tables)

Project Assets (Tables)	6 Months Ended
Project Assets (Tables)	Apr. 30, 2021
Project Assets [Abstract]
Summary of Project Assets	Project assets as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, Estimated 2021 2020 Useful Life Project Assets - Operating $ 125,464 $ 99,351 5-20 years Project Assets - Construction in progress 97,911 91,276 7-20 years 223,375 190,627 Accumulated depreciation (36,133) (28,818) Project Assets, net $ 187,242 $ 161,809

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
Goodwill and Intangible Assets (Tables)	Apr. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following tables summarize the Company’s intangible assets as of April 30, 2021 and October 31, 2020 (in thousands): As of April 30, 2021 Gross Amount Accumulated Net Amount In-Process Research and Development $ 9,592 $ — $ 9,592 Bridgeport PPA 12,320 (2,594) 9,726 Total $ 21,912 $ (2,594) $ 19,318 As of October 31, 2020 Gross Amount Accumulated Net Amount In-Process Research and Development $ 9,592 $ — $ 9,592 Bridgeport PPA 12,320 (1,945) 10,375 Total $ 21,912 $ (1,945) $ 19,967

Other Current Assets (Tables)

Other Current Assets (Tables)	6 Months Ended
Other Current Assets (Tables)	Apr. 30, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	Other current assets as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Advance payments to vendors (1) $ 3,102 $ 1,954 Prepaid expenses and other (2) 7,215 4,352 Other current assets $ 10,317 $ 6,306 (1) Advance payments to vendors relate to payments for inventory purchases ahead of receipt. (2) Primarily relates to other prepaid vendor expenses including insurance expense.

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
Other Assets (Tables)	Apr. 30, 2021
Other Assets Noncurrent [Abstract]
Schedule of Other Assets	Other assets as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Long-term stack residual value (1) $ 702 $ 890 Long-term unbilled receivables (2) 9,881 8,856 Other (3) 5,943 5,593 Other assets $ 16,526 $ 15,339 (1) Relates to estimated residual value for module exchanges performed under the Company’s service agreements where the useful life extends beyond the contractual term of the service agreement and the Company obtains title for the module from the customer upon expiration or non-renewal of the service agreement. If the Company does not obtain rights to title from the customer, the full cost of the module is expensed at the time of the module exchange. (2) Represents unbilled receivables that relate to revenue recognized on customer contracts that will be billed in future periods in excess of 12 months from the balance sheet date. (3) The Company entered into an agreement with one of its customers on June 29, 2016 which includes payments for the purchase of the customer’s power platforms by the Company at the end of the term of the agreement. The payments are to be made in installments over the term of the agreement and the total amount paid as of each of April 30, 2021 and October 31, 2020 was $2.4 million. Also included within “Other” are long-term security deposits and prepaid withholding taxes on deferred revenue as of April 30, 2021 and October 31, 2020.

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	6 Months Ended
Accrued Liabilities (Tables)	Apr. 30, 2021
Accrued Liabilities Current [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Accrued payroll and employee benefits $ 3,256 $ 4,461 Accrued product warranty cost (1) 85 97 Accrued service agreement and PPA costs (2) 7,055 7,037 Accrued legal, taxes, professional and other 3,023 4,086 Accrued liabilities $ 13,419 $ 15,681 (1) The decrease in accrued product warranty cost represents a reduction related to actual warranty activity as contracts progress through the warranty period. Product warranty expense for the three months ended April 30, 2021 and 2020 was $6 thousand and $0.01 million, respectively, and for the six months ended April 30, 2021 and 2020 was $12 thousand and $0.03 million, respectively. (2) Accrued service agreement costs include loss accruals on service agreements of $5.5 million as of each of October 31, 2020 and April 30, 2021. The accruals for performance guarantees, including PPA performance guarantees was $1.6 million as of April 30, 2021, which reflects an increase from $1.4 million as of October 31, 2020.

Leases (Tables)

Leases (Tables)	6 Months Ended
Leases (Tables)	Apr. 30, 2021
Leases [Abstract]
Summary of Undiscounted Maturities of Operating Lease and Finance Lease Liabilities	Undiscounted maturities of operating lease and finance lease liabilities are as follows: Operating Finance Due Year 1 $ 1,303 $ 67 Due Year 2 1,369 52 Due Year 3 813 41 Due Year 4 734 — Due Year 5 734 — Thereafter 25,587 — Total undiscounted lease payments 30,540 160 Less imputed interest (21,475) (26) Total discounted lease payments $ 9,065 $ 134

Stockholders' Equity and Warr_2

Stockholders' Equity and Warrant Liabilities (Tables)	6 Months Ended
Stockholders' Equity and Warrant Liabilities (Tables)	Apr. 30, 2021
Equity [Abstract]
Schedule of Warrant Activity	The following table summarizes outstanding warrant activity during the six months ended April 30, 2021: Series C Warrants Orion Warrants Balance as of October 31, 2020 964,128 2,700,000 Warrants exercised (14,026) (2,700,000) Balance as of April 30, 2021 950,102 —

Loss Per Share (Tables)

Loss Per Share (Tables)	6 Months Ended
Loss Per Share (Tables)	Apr. 30, 2021
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Loss Per Share	The calculation of basic and diluted loss per share was as follows: Three Months Ended April 30, Six Months Ended April 30, 2021 2020 2021 2020 Numerator Net loss $ (18,917) $ (14,769) $ (64,877) $ (54,920) Series B preferred stock dividends (800) (800) (1,600) (1,731) Net loss attributable to common stockholders $ (19,717) $ (15,569) $ (66,477) $ (56,651) Denominator Weighted average basic common shares 322,500,592 211,000,091 317,219,129 206,560,031 Effect of dilutive securities (1) — — — — Weighted average diluted common shares 322,500,592 211,000,091 317,219,129 206,560,031 Basic loss per share $ (0.06) $ (0.07) $ (0.21) $ (0.27) Diluted loss per share (1) $ (0.06) $ (0.07) $ (0.21) $ (0.27) (1) Due to the net loss to common stockholders in each of the periods presented above, diluted loss per share was computed without consideration to potentially dilutive instruments as their inclusion would have been anti-dilutive. As of April 30, 2021 and 2020, potentially dilutive securities excluded from the diluted loss per share calculation are as follows:
Schedule of Potentially Dilutive Securities Excluded from the Diluted Loss Per Share Calculation	April 30, April 30, 2021 2020 Orion Warrants — 8,000,000 May 2017 Offering - Series C Warrants 950,102 964,128 Outstanding options to purchase common stock 22,388 23,891 Unvested Restricted Stock Awards — 2,091 Unvested Restricted Stock Units 2,817,137 63,267 5% Series B Cumulative Convertible Preferred Stock 37,837 37,837 Total potentially dilutive securities 3,827,464 9,091,214

Restricted Cash (Tables)

Restricted Cash (Tables)	6 Months Ended
Restricted Cash (Tables)	Apr. 30, 2021
Restricted Cash And Investments [Abstract]
Summary of Allocation of Restricted Cash	Refer to Note 16. “Debt” for additional information on the release of the restricted cash under the Orion Facility. The allocation of restricted cash is as follows (in thousands): April 30, October 31, 2021 2020 Cash Restricted for Outstanding Letters of Credit (1) $ 6,478 $ 6,543 Cash Restricted for PNC Sale-Leaseback Transactions 14,989 15,125 Cash Restricted for Crestmark Sale-Leaseback Transaction 432 431 Bridgeport Fuel Cell Park Project Debt Service and Performance Reserves 9,668 7,549 Orion Facility - Performance Reserve (2) — 5,000 Orion Facility - Module and Debt Service Reserves (3) — 1,950 Orion Facility - Project Proceeds Account (4) — 4,243 Other 529 1,344 Total Restricted Cash 32,096 42,185 Restricted Cash and Cash Equivalents - Short-Term (5) (17,427) (9,233) Restricted Cash and Cash Equivalents - Long-Term $ 14,669 $ 32,952 (1) Letters of credit outstanding as of April 30, 2021 expire on various dates through August 2028. (2) Short-term reserve that was related to certain project construction and financing milestones. (3) Long-term reserve that was to be used primarily to fund future module exchanges for operating projects falling under the collateral pool (CCSU and Triangle Street) under the Orion Facility. (4) Reserve that was related to proceeds received from project refinancing that was to be used to pay-down the Orion Facility unless redeployed into other project financing (at the option of the Orion Agent and the lenders under the Orion Facility). (5) Short-term restricted cash and cash equivalents are amounts expected to be released and categorized as unrestricted cash within twelve months of the balance sheet date.

Debt (Tables)

Debt (Tables)	6 Months Ended
Debt (Tables)	Apr. 30, 2021
Debt Disclosure [Abstract]
Schedule of Debt	Debt as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands): April 30, October 31, 2021 2020 Orion Energy Partners Credit Facility $ — $ 80,000 Connecticut Green Bank Loan 4,800 4,800 Connecticut Green Bank Loan (Bridgeport Fuel Cell Project) 4,699 5,065 Liberty Bank Term Loan Agreement (Bridgeport Fuel Cell Project) 8,507 9,549 Fifth Third Bank Term Loan Agreement (Bridgeport Fuel Cell Project) 8,507 9,549 Finance obligation for sale-leaseback transactions 48,633 49,274 State of Connecticut Loan 9,041 9,454 Liberty Bank Promissory Note (PPP Note) — 6,515 Finance lease obligations 134 38 Deferred finance costs (1,413) (3,737) Unamortized debt discount — (5,152) Total debt and financing obligations $ 82,908 $ 165,355 Current portion of long-term debt and financing obligations (8,575) (21,366) Long-term debt and financing obligations $ 74,333 $ 143,989

Benefit Plans (Tables)

Benefit Plans (Tables)	6 Months Ended
Benefit Plans (Tables)	Apr. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Share-Based Compensation Reflected in Consolidated Statement of Operations and Comprehensive Loss	Share-based compensation was reflected in the Consolidated Statements of Operations and Comprehensive Loss as follows (in thousands): Three months Ended April 30, Six months Ended April 30, 2021 2020 2021 2020 Cost of revenues $ 141 $ 105 $ 318 $ 222 General and administrative expense 1,054 242 2,237 581 Research and development expense 31 14 63 35 $ 1,226 $ 361 $ 2,618 $ 838
Summary of RSA and RSU Activity	The following table summarizes our RSA and RSU activity for the six months ended April 30, 2021: Restricted Stock Awards and Units Shares Weighted-Average Fair Value Outstanding as of October 31, 2020 2,067,140 $ 5.06 Granted - performance units 551,252 14.89 Granted - time-vesting restricted stock units 296,826 3.28 Vested (221) 20.40 Outstanding as of January 31, 2021 2,914,997 $ 5.46 Granted - time-vesting restricted stock units 37,550 11.05 Vested (81,878) 13.13 Forfeited (53,532) 10.86 Outstanding as of April 30, 2021 2,817,137 $ 5.24

Nature of Business and Basis _3

Nature of Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands, $ in Millions	Dec. 07, 2020USD ($)	Feb. 28, 2021USD ($)	Dec. 31, 2020USD ($)$ / shares	Apr. 30, 2021USD ($)	Dec. 17, 2020USD ($)	Dec. 17, 2020CAD ($)	Oct. 31, 2020USD ($)
Nature Of Business And Basis Of Presentation [Line Items]
Cash and cash equivalents, unrestricted				$ 139,086			$ 149,867
Underwritten Offering Shares \| $ / shares			$ 25
Net proceeds from underwriting shares after deducting underwriting discounts and commissions			$ 156,400
Unrestricted cash				$ 47,500
Enbridge Inc. [Member] \| Series 1 Preferred Shares [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Related Party Transaction, Due from (to) Related Party					$ 21,500	$ 27.4
Sr. Secured Debt [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Settlement of outstanding principal payment and interest	$ 87,300
Unrestricted cash	$ 11,200
Liberty Bank Promissory Note (PPP Note) [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Repayments of debt		$ 6,500

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020
Disaggregation Of Revenue [Line Items]
Contract asset	$ 17.5	$ 16.9
Contract liability	44.2	$ 41.9
Service Agreements [Member]
Disaggregation Of Revenue [Line Items]
Remaining performance obligations	141.4
Licensing Agreements [Member]
Disaggregation Of Revenue [Line Items]
Remaining performance obligations	22.2
Advanced Technologies Contracts [Member]
Disaggregation Of Revenue [Line Items]
Remaining performance obligations	45
Posco Energy [Member]
Disaggregation Of Revenue [Line Items]
Deferred revenue	$ 22.2

Accounts Receivable, Net and _3

Accounts Receivable, Net and Unbilled Receivables - Schedule of Accounts Receivable, Net and Unbilled Receivables (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Receivables [Abstract]
Amount billed		$ 10,183	$ 7,329
Unbilled receivables	[1]	6,289	7,063
Commercial customers accounts receivable		16,472	14,392
Advanced Technologies including U.S. government, Amount billed	[2]	1,964	2,234
Advanced Technologies including U.S. government, Unbilled receivables	[2]	1,371	978
Advanced Technologies including U.S. government, Accounts receivable	[2]	3,335	3,212
Accounts receivable, net and unbilled receivables		$ 19,807	$ 17,604

[1]	Additional long-term unbilled receivables of $9.9 million and $8.9 million are included within “Other Assets” as of April 30, 2021 and October 31, 2020, respectively.
[2]	Total U.S. government accounts receivable, including unbilled receivables, outstanding as of April 30, 2021 and October 31, 2020 were $1.0 million and $1.1 million, respectively.

Accounts Receivable, Net and _4

Accounts Receivable, Net and Unbilled Receivables - Schedule of Accounts Receivable, Net and Unbilled Receivables (Parenthetical) (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Additional long-term unbilled receivables	[1]	$ 6,289	$ 7,063
Government [Member]
Accounts Notes And Loans Receivable [Line Items]
U.S. government accounts receivable, including unbilled receivables		1,000	1,100
Other Assets [Member]
Accounts Notes And Loans Receivable [Line Items]
Additional long-term unbilled receivables		$ 9,900	$ 8,900

[1]	Additional long-term unbilled receivables of $9.9 million and $8.9 million are included within “Other Assets” as of April 30, 2021 and October 31, 2020, respectively.

Accounts Receivable, Net and _5

Accounts Receivable, Net and Unbilled Receivables - Additional Information (Details) - USD ($)	Apr. 30, 2021	Oct. 31, 2020
Receivables [Abstract]
Allowance for doubtful accounts receivable, current	$ 0	$ 0

Inventories - Components of Inv

Inventories - Components of Inventories (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Inventory Disclosure [Abstract]
Raw materials		$ 27,075	$ 21,726
Work-in-process	[1]	36,431	38,231
Inventories		63,506	59,957
Inventories - short-term		(58,920)	(50,971)
Inventories - long-term	[2]	$ 4,586	$ 8,986

[1]	Work-in-process includes the standard components of inventory used to build the typical modules or module components that are intended to be used in future project asset construction or power plant orders or for use under the Company’s service agreements. Included in work-in-process as of April 30, 2021 and October 31, 2020 was $22.2 million and $19.6 million, respectively, of completed standard components and modules.
[2]	Long-term inventory includes modules that are contractually required to be segregated for use as exchange modules for specific project assets.

Inventories - Components of I_2

Inventories - Components of Inventories (Parenthetical) (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020
Inventory Disclosure [Abstract]
Completed standard component and modules	$ 22.2	$ 19.6

Inventories - Additional Inform

Inventories - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Costs of Revenues [Member]
Inventory [Line Items]
Excess plant capacity and manufacturing variances cost incurred	$ 1.3	$ 2.7	$ 3.4	$ 4.4

Project Assets - Summary of Pro

Project Assets - Summary of Project Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2021	Oct. 31, 2020
Project Assets [Line Items]
Project Assets, gross	$ 223,375	$ 190,627
Accumulated depreciation	(36,133)	(28,818)
Project Assets, net	187,242	161,809
Project Assets - Operating [Member]
Project Assets [Line Items]
Project Assets, gross	$ 125,464	99,351
Project Assets - Operating [Member] \| Minimum [Member]
Project Assets [Line Items]
Project assets estimated useful life	5 years
Project Assets - Operating [Member] \| Maximum [Member]
Project Assets [Line Items]
Project assets estimated useful life	20 years
Project Assets - Construction in progress [Member]
Project Assets [Line Items]
Project Assets, gross	$ 97,911	$ 91,276
Project Assets - Construction in progress [Member] \| Minimum [Member]
Project Assets [Line Items]
Project assets estimated useful life	7 years
Project Assets - Construction in progress [Member] \| Maximum [Member]
Project Assets [Line Items]
Project assets estimated useful life	20 years

Project Assets - Additional Inf

Project Assets - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2021USD ($)	Apr. 30, 2020USD ($)	Apr. 30, 2021USD ($)item	Apr. 30, 2020USD ($)	Oct. 31, 2020USD ($)item
Project Assets [Abstract]
Number of project assets \| item			8		8
Sale leaseback transaction, net book value	$ 89.3		$ 89.3		$ 70.5
Project asset depreciation	3.3	$ 2.8	7.3	$ 5.8
Long-term project assets construction in progress	97.9		97.9		91.3
PPA assets construction in progress	$ 4.8		$ 4.8		$ 4.8

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 4,075		$ 4,075		$ 4,075
Intangible assets, net	19,318		19,318		$ 19,967
Bridgeport Fuel Cell, LLC [Member]
Goodwill And Intangible Assets [Line Items]
Amortization expenses	$ 300	$ 300	$ 600	$ 700

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Oct. 31, 2020
Finite Lived Intangible Assets [Line Items]
Gross Amount	$ 21,912	$ 21,912
Accumulated Amortization	(2,594)	(1,945)
Net Amount	19,318	19,967
Bridgeport PPA [Member]
Finite Lived Intangible Assets [Line Items]
Gross Amount	12,320	12,320
Accumulated Amortization	(2,594)	(1,945)
Net Amount	9,726	10,375
In Process Research And Development [Member]
Finite Lived Intangible Assets [Line Items]
Gross Amount	9,592	9,592
Net Amount	$ 9,592	$ 9,592

Other Current Assets - Schedule

Other Current Assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Advance payments to vendors	[1]	$ 3,102	$ 1,954
Prepaid expenses and other	[2]	7,215	4,352
Other current assets		$ 10,317	$ 6,306

[1]	Advance payments to vendors relate to payments for inventory purchases ahead of receipt.
[2]	Primarily relates to other prepaid vendor expenses including insurance expense.

Other Assets - Schedule of Othe

Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Other Assets Noncurrent [Abstract]
Long-term stack residual value	[1]	$ 702	$ 890
Long-term unbilled receivables	[2]	9,881	8,856
Other	[3]	5,943	5,593
Other assets		$ 16,526	$ 15,339

[1]	Relates to estimated residual value for module exchanges performed under the Company’s service agreements where the useful life extends beyond the contractual term of the service agreement and the Company obtains title for the module from the customer upon expiration or non-renewal of the service agreement. If the Company does not obtain rights to title from the customer, the full cost of the module is expensed at the time of the module exchange.
[2]	Represents unbilled receivables that relate to revenue recognized on customer contracts that will be billed in future periods in excess of 12 months from the balance sheet date.
[3]	The Company entered into an agreement with one of its customers on June 29, 2016 which includes payments for the purchase of the customer’s power platforms by the Company at the end of the term of the agreement. The payments are to be made in installments over the term of the agreement and the total amount paid as of each of April 30, 2021 and October 31, 2020 was $2.4 million. Also included within “Other” are long-term security deposits and prepaid withholding taxes on deferred revenue as of April 30, 2021 and October 31, 2020.

Other Assets - Schedule of Ot_2

Other Assets - Schedule of Other Assets (Parenthetical) (Details) $ in Millions	Apr. 30, 2021USD ($)	Oct. 31, 2020USD ($)	Jun. 29, 2016customer
Other Assets Noncurrent [Abstract]
Number of customers under agreement \| customer			1
Contractual Obligation \| $	$ 2.4	$ 2.4

Schedule of Accrued Liabilities

Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Accrued Liabilities Current [Abstract]
Accrued payroll and employee benefits		$ 3,256	$ 4,461
Accrued product warranty cost	[1]	85	97
Accrued service agreement and PPA costs	[2]	7,055	7,037
Accrued legal, taxes, professional and other		3,023	4,086
Accrued liabilities		$ 13,419	$ 15,681

[1]	The decrease in accrued product warranty cost represents a reduction related to actual warranty activity as contracts progress through the warranty period. Product warranty expense for the three months ended April 30, 2021 and 2020 was $6 thousand and $0.01 million, respectively, and for the six months ended April 30, 2021 and 2020 was $12 thousand and $0.03 million, respectively.
[2]	Accrued service agreement costs include loss accruals on service agreements of $5.5 million as of each of October 31, 2020 and April 30, 2021. The accruals for performance guarantees, including PPA performance guarantees was $1.6 million as of April 30, 2021, which reflects an increase from $1.4 million as of October 31, 2020.

Schedule of Accrued Liabiliti_2

Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Schedule Of Accrued Liabilities [Line Items]
Product warranty accrual, payment and adjustments	$ 6	$ 10	$ 12	$ 30
Loss reserve on service agreements	5,500		5,500		$ 5,500
Bridgeport Fuel Cell Project [Member]
Schedule Of Accrued Liabilities [Line Items]
Reserve for performance guarantees	$ 1,600		$ 1,600		$ 1,400

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Lessee Lease Description [Line Items]
Finance lease ROU assets	$ 100		$ 100		$ 40
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net		Property, plant and equipment, net		Property, plant and equipment, net
Finance lease, liability	$ 134		$ 134		$ 38
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Long-term debt and other liabilities		Long-term debt and other liabilities		Long-term debt and other liabilities
Operating lease expense	$ 400	$ 100	$ 761	$ 315
Operating lease, weighted average remaining lease term	20 years		20 years
Operating lease, weighted average discount rate	7.80%		7.80%
Operating lease, payments	$ 300	$ 200	$ 586	$ 460
Minimum [Member]
Lessee Lease Description [Line Items]
Operating and finance lease, remaining lease term			1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating and finance lease, remaining lease term			26 years

Leases - Summary of Undiscounte

Leases - Summary of Undiscounted Maturities of Operating Lease and Finance Lease Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Oct. 31, 2020
Operating Leases
2021 (remaining)	$ 1,303
2022	1,369
2023	813
2024	734
2025	734
Thereafter	25,587
Total undiscounted lease payments	30,540
Less imputed interest	(21,475)
Total discounted lease payments	9,065
Finance Leases
2021 (remaining)	67
2022	52
2023	41
Total undiscounted lease payments	160
Less imputed interest	(26)
Total discounted lease payments	$ 134	$ 38

Stockholders' Equity and Warr_3

Stockholders' Equity and Warrant Liabilities - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 07, 2020	Dec. 04, 2020	Jan. 08, 2020	Nov. 22, 2019	Oct. 31, 2019	May 03, 2017	Apr. 30, 2021	Jan. 31, 2021	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2021	Apr. 30, 2020	Apr. 08, 2021	Oct. 31, 2020	Apr. 08, 2020	Apr. 07, 2020
Stockholders' Equity Note
Number of incremental common stock shares approved													162,500,000
Common stock, shares authorized							500,000,000				500,000,000			337,500,000	500,000,000	337,500,000
Sale of stock, price per share		$ 7.95	$ 2.29						$ 2.02	$ 1.59		$ 2.02
Common stock issuance, net of fees											$ 156,368
Class of warrants or rights issued										9,396,320
Class of warrants or rights exercised										12,000,000
Expected volatility	117.02%		103.70%							104.90%		107.40%
Risk-free interest rate	0.70%		1.81%							1.45%		0.57%
Class of warrants or rights charge			$ 23,700					$ 16,000	$ 3,400	$ 10,500
Reclassification of estimated fair value of warrant liability to additional paid in capital	$ 21,200		$ 26,000
Common Stock [Member]
Stockholders' Equity Note
Stock issued during period shares new issues								25,000,000		7,938,228
Orion Energy Partners Investment Agent, LLC Credit Facility [Member]
Stockholders' Equity Note
Class of warrants or rights exercised														2,700,000
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] \| Exercise Price 0.242 [Member]
Stockholders' Equity Note
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.242
Class of warrants or rights issued	2,700,000
Class of warrants or rights issued value	$ 653,400
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] \| Initial Funding Warrants [Member]
Stockholders' Equity Note
Class of warrants or rights issued					6,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.310
Drew down to fully repay debt outstanding					$ 14,500
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] \| Second Funding Warrants [Member]
Stockholders' Equity Note
Class of warrants or rights issued				14,000,000
Drew down to fully repay debt outstanding				$ 65,500
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] \| Second Funding Warrants [Member] \| Exercise Price 0.242 [Member]
Stockholders' Equity Note
Class of warrants or rights issued				8,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.242
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] \| Second Funding Warrants [Member] \| Exercise Price 0.620 [Member]
Stockholders' Equity Note
Class of warrants or rights issued				6,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.62
Underwriting Agreement [Member]
Stockholders' Equity Note
Stock issued to underwriters		19,822,219
Sale of stock, number of shares issued in transaction		14,696,320
Sale of stock, price per share		$ 6.50
Stock issued during period shares new issues		25,000,000
Common stock issuance, net of fees		$ 162,500
Underwriting discounts and commissions		$ 0.2275
Net proceeds from issuance of common stock		$ 156,400
Underwriting Agreement [Member] \| Maximum [Member]
Stockholders' Equity Note
Option to purchase additional common stock shares		5,177,781
Underwritten Public Offering [Member]
Stockholders' Equity Note
Stock issued during period shares new issues						1,000,000
Underwritten Public Offering [Member] \| May 2017 Offering - Series C Warrants
Stockholders' Equity Note
Class of warrants or rights issued						1,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 19.20
Class of warrant or right term						5 years
Underwritten Public Offering [Member] \| Common Stock [Member] \| May 2017 Offering - Series C Warrants
Stockholders' Equity Note
Class of warrants or rights exercised							14,026				14,026
Proceeds from warrant exercises							$ 300				$ 300

Stockholders' Equity and Warr_4

Stockholders' Equity and Warrant Liabilities - Schedule of Warrant Activity (Details)	6 Months Ended
	Apr. 30, 2021shares
Orion Energy Partners Investment Agent, LLC Credit Facility [Member]
Class of Warrant or Right, Outstanding	2,700,000
Common stock issued during period, warrants exercised	(2,700,000)
May 2017 Offering - Series C Warrants
Class of Warrant or Right, Outstanding	964,128
Common stock issued during period, warrants exercised	(14,026)
Class of Warrant or Right, Outstanding	950,102

Redeemable Preferred Stock - Ad

Redeemable Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Thousands	Dec. 18, 2020USD ($)	Mar. 31, 2005shares	Apr. 30, 2021USD ($)$ / sharesshares	Apr. 30, 2021CAD ($)	Apr. 30, 2020USD ($)	Apr. 30, 2020CAD ($)	Jan. 31, 2020USD ($)	Jan. 31, 2020CAD ($)	Apr. 30, 2021USD ($)$ / sharesshares	Apr. 30, 2021CAD ($)	Apr. 30, 2020USD ($)	Apr. 30, 2020CAD ($)	Dec. 31, 2020CAD ($)	Dec. 18, 2020CAD ($)	Oct. 31, 2020USD ($)shares	Oct. 31, 2020CAD ($)shares
Class Of Stock [Line Items]
Preferred stock, par value \| $ / shares			$ 0.01						$ 0.01
Derivative liability, fair value, gross liability					$ 600						$ 600
Maximum [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized \| shares			250,000						250,000
Series B Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized \| shares		105,875	105,875						105,875
Preferred stock, dividend rate, percentage		5.00%
Preferred stock, liquidation preference per share \| $ / shares			$ 1,000						$ 1,000
Preferred stock, shares issued \| shares			64,020						64,020						64,020	64,020
Preferred stock shares outstanding \| shares			64,020						64,020						64,020	64,020
Temporary equity, carrying amount, attributable to parent			$ 59,857						$ 59,857						$ 59,857
Dividends, preferred stock, cash			$ 800		$ 800				$ 1,600		3,200
Series B Preferred Stock [Member] \| Dividends Paid Date Represented [Member]
Class Of Stock [Line Items]
Dividends, preferred stock, cash											$ 2,400
Class A Preferred Shares [Member]
Class Of Stock [Line Items]
Preferred stock, shares issued \| shares															1,000,000	1,000,000
Interest expense, other				$ 0		$ 700,000				$ 600,000		$ 1,300,000
Carrying value of preferred shares, total															$ 19,200
Increase in dividend rate annually									15.00%	15.00%
Aggregate amount of dividend payment										$ 500,000
Return of capital payments										$ 750,000
Loss resulted from revised fair value of preferred shares							$ 200	$ 200,000
Class A Preferred Shares [Member] \| Minimum [Member]
Class Of Stock [Line Items]
Preferred stock, redemption date									Dec. 31, 2020	Dec. 31, 2020
Class A Preferred Shares [Member] \| Maximum [Member]
Class Of Stock [Line Items]
Preferred stock, redemption date									Dec. 31, 2021	Dec. 31, 2021
Series 1 Preferred Shares [Member]
Class Of Stock [Line Items]
Carrying value of preferred shares, total																$ 25,600,000
Series 1 Preferred Shares [Member] \| Enbridge Incorporation [Member]
Class Of Stock [Line Items]
Carrying value of preferred shares, total													$ 27,400,000
Accrued dividend													23,100,000
Preferred stock redemption amount													$ 4,300,000
Payment of amount owed														$ 27,400,000
Gains losses on extinguishment of debt	$ 900

Loss Per Share - Calculation of

Loss Per Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
		Apr. 30, 2021	Jan. 31, 2021	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2021	Apr. 30, 2020
Numerator
Net loss		$ (18,917)	$ (45,960)	$ (14,769)	$ (40,151)	$ (64,877)	$ (54,920)
Preferred dividends - Series B		(800)	$ (800)	(800)	$ (931)
Net loss attributable to common stockholders		$ (19,717)		$ (15,569)		$ (66,477)	$ (56,651)
Denominator
Weighted average basic common shares		322,500,592		211,000,091		317,219,129	206,560,031
Effect of dilutive securities	[1]	0		0		0	0
Weighted average diluted common shares		322,500,592		211,000,091		317,219,129	206,560,031
Basic loss per share		$ (0.06)		$ (0.07)		$ (0.21)	$ (0.27)
Diluted loss per share	[1]	$ (0.06)		$ (0.07)		$ (0.21)	$ (0.27)
Series B Preferred Stock [Member]
Numerator
Preferred dividends - Series B		$ (800)		$ (800)		$ (1,600)	$ (1,731)

[1]	Due to the net loss to common stockholders in each of the periods presented above, diluted loss per share was computed without consideration to potentially dilutive instruments as their inclusion would have been anti-dilutive.

Loss Per Share - Schedule of Po

Loss Per Share - Schedule of Potentially Dilutive Securities Excluded from the Diluted Loss Per Share Calculation (Details) - shares	6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation	3,827,464	9,091,214
Orion Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation		8,000,000
May 2017 Offering - Series C Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation	950,102	964,128
Outstanding Options To Purchase Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation	22,388	23,891
Unvested Restricted Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation		2,091
Unvested Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation	2,817,137	63,267
Series B Cumulative Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation	37,837	37,837

Restricted Cash - Additional In

Restricted Cash - Additional Information (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020
Restricted Cash And Investments [Abstract]
Restricted cash and cash equivalents	$ 32.1	$ 42.2

Restricted Cash - Summary of Al

Restricted Cash - Summary of Allocation of Restricted Cash (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Restricted Cash And Investments [Abstract]
Cash Restricted for Outstanding Letters of Credit	[1]	$ 6,478	$ 6,543
Cash Restricted for PNC Sale-Leaseback Transactions		14,989	15,125
Cash Restricted for Crestmark Sale-Leaseback Transaction		432	431
Bridgeport Fuel Cell Park Project Debt Service and Performance Reserves		9,668	7,549
Orion Facility - Performance Reserve	[2]		5,000
Orion Facility - Module and Debt Service Reserves	[3]		1,950
Orion Facility - Project Proceeds Account	[4]		4,243
Other		529	1,344
Total Restricted Cash		32,096	42,185
Restricted Cash and Cash Equivalents - Short-Term	[5]	(17,427)	(9,233)
Restricted cash and cash equivalents - long-term		$ 14,669	$ 32,952

[1]	Letters of credit outstanding as of April 30, 2021 expire on various dates through August 2028.
[2]	Short-term reserve that was related to certain project construction and financing milestones.
[3]	Long-term reserve that was to be used primarily to fund future module exchanges for operating projects falling under the collateral pool (CCSU and Triangle Street) under the Orion Facility.
[4]	Reserve that was related to proceeds received from project refinancing that was to be used to pay-down the Orion Facility unless redeployed into other project financing (at the option of the Orion Agent and the lenders under the Orion Facility).
[5]	Short-term restricted cash and cash equivalents are amounts expected to be released and categorized as unrestricted cash within twelve months of the balance sheet date.

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Oct. 31, 2020
Debt Instrument [Line Items]
Finance lease, liability	$ 134	$ 38
Deferred finance costs	(1,413)	(3,737)
Unamortized debt discount		(5,152)
Total debt and financing obligations	82,908	165,355
Current portion of long-term debt and financing obligations	(8,575)	(21,366)
Long-term debt and financing obligations	74,333	143,989
Orion Energy Partners Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit		80,000
Connecticut Green Bank Loan [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	4,800	4,800
Connecticut Green Bank Loan (Bridgeport Fuel Cell Project) [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	4,699	5,065
Liberty Bank Term Loan Agreement (Bridgeport Fuel Cell Project) [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	8,507	9,549
Finance Obligation for Sale-Lease Back Transactions [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	48,633	49,274
State Of Connecticut [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	9,041	9,454
Fifth Third Bank Term Loan Agreement (Bridgeport Fuel Cell Project) [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	$ 8,507	9,549
Liberty Bank Promissory Note (PPP Note) [Member]
Debt Instrument [Line Items]
Long-term Line of Credit		$ 6,515

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($) $ in Millions	Dec. 17, 2020	Dec. 07, 2020	Nov. 30, 2020	Apr. 24, 2020
Payoff Letter [Member]
Debt Instrument [Line Items]
Long-term line of credit after discount		$ 87.3
Debt instrument prepayment premium	$ 4		$ 14.9
Remaining deferred finance expense	7.1
Repayments of lines of credit	11.2
Payoff Letter [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt prepayment premium amount to be waived		$ 4
Prepayment Premium And WriteOff [Member]
Debt Instrument [Line Items]
Debt prepayment premium expense amount	$ 4
Liberty Bank Promissory Note (PPP Note) [Member] \| Liberty Bank [Member] \| CARES Act [Member]
Debt Instrument [Line Items]
Proceeds from long-term lines of credit				$ 6.5

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Details) - $ / shares	Nov. 24, 2020	Apr. 30, 2021	Apr. 08, 2021	Oct. 31, 2020	Apr. 08, 2020	Apr. 07, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Description		Should the Company’s share price achieve the 200% performance level, awardees will receive up to 551,252 additional RSUs.
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Oct. 31, 2023
Common stock, shares authorized		500,000,000		337,500,000	500,000,000	337,500,000
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Awards and Units, Granted, Shares		551,252
Performance shares expensed period		3 years
Time Based Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Awards and Units, Granted, Shares		296,826
TSR Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Awards and Units, Granted, Shares		275,626
Performance awards valued per share		$ 14.41
Absolute Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Awards and Units, Granted, Shares		275,626
Performance awards valued per share		$ 15.36
2018 Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Description	The LTI Plan consists of three award components: (1) relative total shareholder return (“TSR”) performance units, (2) absolute TSR performance units, and (3) time-vesting restricted stock units.
LTI Plan [Member] \| Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Awards and Units, Granted, Shares	848,078
Second Amended and Restated Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized			12,333,333
Maximum [Member] \| LTI Plan [Member] \| Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional shares issued upon performance		551,252
Maximum [Member] \| Second Amended and Restated Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional shares authorized			8,000,000

Benefit Plans - Schedule of Sha

Benefit Plans - Schedule of Share-Based Compensation Reflected in Consolidated Statement of Operations and Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 1,226	$ 361	$ 2,618	$ 838
Costs of Revenues [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	141	105	318	222
General and Administrative Expenses [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	1,054	242	2,237	581
Research and Development Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 31	$ 14	$ 63	$ 35

Benefit Plans - Summary of RSA

Benefit Plans - Summary of RSA and RSU Activity (Details) - $ / shares	3 Months Ended	6 Months Ended
	Apr. 30, 2021	Apr. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Awards and Units, Outstanding, Shares, Beginning Balance	2,914,997	2,067,140
Restricted Stock Awards and Units, Vested, Shares	(81,878)	(221)
Restricted Stock Awards and Units, Forfeited, Shares	(53,532)
Restricted Stock Awards and Units, Outstanding, Shares, Ending Balance	2,817,137	2,817,137
Restricted Stock Awards and Units, Outstanding, Weighted-Average Fair Value, Beginning Balance	$ 5.46	$ 5.06
Restricted Stock Awards and Units, Vested, Weighted-Average Fair Value	13.13	20.40
Restricted Stock Awards and Units, Forfeited, Weighted-Average Fair Value	10.86
Restricted Stock Awards and Units, Outstanding, Weighted-Average Fair Value, Ending Balance	$ 5.24	$ 5.24
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Awards and Units, Granted, Shares		551,252
Restricted Stock Awards and Units, Granted, Weighted-Average Fair Value		$ 14.89
Time Based Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Awards and Units, Granted, Shares	37,550	296,826
Restricted Stock Awards and Units, Granted, Weighted-Average Fair Value	$ 11.05	$ 3.28

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Oct. 31, 2020	Sep. 14, 2020	Jun. 28, 2020	Apr. 27, 2020	Apr. 30, 2021
Commitments And Contingencies [Line Items]
Recorded unconditional purchase obligation					$ 73.9
Loss contingency, damages sought	$ 880
Accounts receivable outstanding					8
Posco Energy [Member]
Commitments And Contingencies [Line Items]
Loss contingency, damages sought			$ 200	$ 3.3
Unspecified warranty claims				7
License termination				$ 110
Bond amount					$ 46
Loss contingency, claimed Loss		$ 1