FuelCell Energy (FCEL) 10-Q 17 Jun 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Apr. 30, 2019	Jun. 13, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	FUELCELL ENERGY INC
Entity Central Index Key	0000886128
Document Type	10-Q
Document Period End Date	Apr. 30, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	FCEL
Current Fiscal Year End Date	--10-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		27,424,239
Entity Address, State or Province	Connecticut
Entity Current Reporting Status	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

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 30, 2019	Oct. 31, 2018
Current assets:
Cash and cash equivalents, unrestricted	$ 14,889	$ 39,291
Restricted cash and cash equivalents - short-term	1,743	5,806
Accounts receivable, net	11,842	9,280
Unbilled receivables	11,078	13,759
Inventories	57,043	53,575
Other current assets	7,668	8,592
Total current assets	104,263	130,303
Restricted cash and cash equivalents - long-term	36,350	35,142
Project assets	123,136	99,600
Property, plant and equipment, net	43,560	48,204
Goodwill	4,075	4,075
Intangible asset	9,592	9,592
Other assets	20,251	13,505
Total assets	341,227	340,421
Current liabilities:
Current portion of long-term debt	54,815	17,596
Accounts payable	27,810	22,594
Accrued liabilities	10,954	7,632
Deferred revenue	16,331	11,347
Preferred stock obligation of subsidiary	930	952
Total current liabilities	110,840	60,121
Long-term deferred revenue	22,470	16,793
Long-term preferred stock obligation of subsidiary	14,942	14,965
Long-term debt and other liabilities	59,575	71,619
Total liabilities	207,827	163,498
Stockholders’ equity:
Common stock ($0.0001 par value); 225,000,000 shares authorized as of April 30, 2019 and October 31, 2018; 13,709,330 and 7,972,686 shares issued and outstanding as of April 30, 2019 and October 31, 2018, respectively	1	1
Additional paid-in capital	1,084,969	1,073,463
Accumulated deficit	(1,034,599)	(990,867)
Accumulated other comprehensive loss	(536)	(403)
Treasury stock, Common, at cost (42,496 and 13,042 shares as of April 30, 2019 and October 31, 2018, respectively)	(466)	(363)
Deferred compensation	466	363
Total stockholders’ equity	49,835	82,194
Total liabilities and stockholders' equity	341,227	340,421
Series B Preferred Stock [Member]
Current liabilities:
Redeemable preferred stock	59,857	59,857
Series C Preferred Stock [Member]
Current liabilities:
Redeemable preferred stock	3,162	7,480
Series D Preferred Stock [Member]
Current liabilities:
Redeemable preferred stock	$ 20,546	$ 27,392

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2019	Oct. 31, 2018
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	225,000,000	225,000,000
Common stock, shares issued	13,709,330	7,972,686
Common stock, shares outstanding	13,709,330	7,972,686
Treasury stock, shares	42,496	13,042
Series B Preferred Stock [Member]
Preferred Stock, Liquidation Preference, Value	$ 64,020	$ 64,020
Series C Preferred Stock [Member]
Preferred Stock, Liquidation Preference, Value	1,618	8,992
Series D Preferred Stock [Member]
Preferred Stock, Liquidation Preference, Value	$ 18,462	$ 30,680

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Revenues:
Revenues	$ 9,216,000	$ 20,830,000	$ 26,999,000	$ 59,443,000
Costs of revenues:
Costs of revenues	12,856,000	21,459,000	32,844,000	55,437,000
Gross (loss) profit	(3,640,000)	(629,000)	(5,845,000)	4,006,000
Operating expenses:
Administrative and selling expenses	9,805,000	7,085,000	16,564,000	13,227,000
Research and development expenses	4,178,000	5,021,000	10,458,000	9,067,000
Total costs and expenses	13,983,000	12,106,000	27,022,000	22,294,000
Loss from operations	(17,623,000)	(12,735,000)	(32,867,000)	(18,288,000)
Interest expense	(1,807,000)	(2,059,000)	(4,271,000)	(4,200,000)
Other income (expense), net	(31,000)	1,620,000	129,000	2,096,000
Loss before benefit (provision) for income taxes	(19,461,000)	(13,174,000)	(37,009,000)	(20,392,000)
(Provision) benefit for income taxes	(69,000)	0	(69,000)	3,035,000
Net loss	(19,530,000)	(13,174,000)	(37,078,000)	(17,357,000)
Preferred stock dividends	(800,000)	(800,000)
Net loss attributable to common stockholders	$ (22,876,000)	$ (18,173,000)	$ (55,914,000)	$ (26,619,000)
Loss per share basic and diluted:
Net loss per share attributable to common stockholders	$ (2.06)	$ (2.74)	$ (5.77)	$ (4.22)
Basic and diluted weighted average shares outstanding	11,090,698	6,630,272	9,683,253	6,310,964
Series A Warrant [Member]
Operating expenses:
Warrant exchange	$ (3,169,000)		$ (3,169,000)
Series B Preferred Stock [Member]
Operating expenses:
Preferred stock dividends	(800,000)	$ (800,000)	(1,600,000)	$ (1,600,000)
Series C Preferred Stock [Member]
Operating expenses:
Preferred stock deemed contributions (dividends) and redemption value adjustment, net	1,599,000	(4,199,000)	(7,406,000)	(7,662,000)
Series D Preferred Stock [Member]
Operating expenses:
Preferred stock deemed dividends and redemption accretion	(976,000)	0	(6,661,000)	0
Product [Member]
Revenues:
Revenues		12,200,000		41,730,000
Costs of revenues:
Costs of revenues	6,393,000	13,947,000	9,815,000	40,084,000
Service and License [Member]
Revenues:
Revenues	2,598,000	3,206,000	14,370,000	7,310,000
Costs of revenues:
Costs of revenues	1,745,000	2,531,000	14,064,000	5,937,000
Generation [Member]
Revenues:
Revenues	1,633,000	1,742,000	3,112,000	3,634,000
Costs of revenues:
Costs of revenues	1,685,000	2,036,000	3,321,000	3,645,000
Advanced Technologies [Member]
Revenues:
Revenues	4,985,000	3,682,000	9,517,000	6,769,000
Costs of revenues:
Costs of revenues	$ 3,033,000	$ 2,945,000	$ 5,644,000	$ 5,771,000

Statement of Comprehensive Loss

Statement of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (19,530)	$ (13,174)	$ (37,078)	$ (17,357)
Foreign currency translation adjustments	(140)	54	(133)	87
Total comprehensive loss	$ (19,670)	$ (13,120)	$ (37,211)	$ (17,270)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Series D Preferred Stock [Member]	Series C Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Series D Preferred Stock [Member]	Additional Paid-in Capital [Member]Series C Preferred Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Deferred Compensation [Member]
Balance at at Oct. 31, 2017	$ 101,256			$ 1	$ 1,045,203			$ (943,533)	$ (415)	$ (280)	$ 280
Balance at (in shares) at Oct. 31, 2017				5,791,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of warrants	2,647				2,647
Exercise of warrants, (in shares)				172,200
Share based compensation	617				617
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans	(75)				(75)
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares)				(8,912)
Series C convertible preferred stock conversions	7,569				7,569
Series C convertible preferred stock conversions, (in shares)				512,487
Preferred stock dividends	(800)				(800)
Effect of foreign currency translation	33								33
Net loss attributable to FuelCell Energy, Inc.	(4,183)							(4,183)
Balance at at Jan. 31, 2018	107,064			$ 1	1,055,161			(947,716)	(382)	(280)	280
Balance at (in shares) at Jan. 31, 2018				6,466,843
Balance at at Oct. 31, 2017	101,256			$ 1	1,045,203			(943,533)	(415)	(280)	280
Balance at (in shares) at Oct. 31, 2017				5,791,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of foreign currency translation	87
Net loss attributable to FuelCell Energy, Inc.	(17,357)
Balance at at Apr. 30, 2018	102,291			$ 1	1,063,508			(960,890)	(328)	(447)	447
Balance at (in shares) at Apr. 30, 2018				7,074,897
Balance at at Jan. 31, 2018	107,064			$ 1	1,055,161			(947,716)	(382)	(280)	280
Balance at (in shares) at Jan. 31, 2018				6,466,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of warrants	621				621
Exercise of warrants, (in shares)				44,109
Common stock issued, non-employee compensation	282				282
Common stock issued, non-employee compensation, (in shares)				10,066
Share based compensation	761				761
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans	(546)				(546)
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares)				(1,282)
Series C convertible preferred stock conversions	8,029				8,029
Series C convertible preferred stock conversions, (in shares)				559,844
Preferred stock dividends	(800)				(800)
Effect of foreign currency translation	54								54
Adjustment for deferred compensation											167
Adjustment for deferred compensation, (in shares)				(4,683)
Adjustment for deferred compensation										(167)
Net loss attributable to FuelCell Energy, Inc.	(13,174)							(13,174)
Balance at at Apr. 30, 2018	102,291			$ 1	1,063,508			(960,890)	(328)	(447)	447
Balance at (in shares) at Apr. 30, 2018				7,074,897
Balance at at Oct. 31, 2018	$ 82,194			$ 1	1,073,463			(990,867)	(403)	(363)	363
Balance at (in shares) at Oct. 31, 2018	7,972,686			7,972,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation	$ 987				987
Fee adjustment for common stock issuance	90				90
Common stock issued under benefit plans, net of taxes paid upon vesting of restricted stock awards	27				27
Common stock issued under benefit plans, net of taxes paid upon vesting of restricted stock awards, (in shares)				1,946
Series C convertible preferred stock conversions	1,974				1,974
Series C convertible preferred stock conversions, (in shares)				127,829
Series C convertible preferred stock adjustment for beneficial conversion feature	6,586				6,586
Series C convertible stock redemption value adjustments	(8,550)				(8,550)
Series D convertible preferred stock conversions	4,334				4,334
Series D convertible preferred stock conversions, (in shares)				932,144
Convertible preferred stock redemption accretion		$ (3,793)				$ (3,793)
Preferred stock dividends	(800)				(800)
Impact of the adoption of Topic 606	(6,654)							(6,654)
Effect of foreign currency translation	7								7
Net loss attributable to FuelCell Energy, Inc.	(17,548)							(17,548)
Balance at at Jan. 31, 2019	58,854			$ 1	1,074,318			(1,015,069)	(396)	(363)	363
Balance at (in shares) at Jan. 31, 2019				9,034,605
Balance at at Oct. 31, 2018	$ 82,194			$ 1	1,073,463			(990,867)	(403)	(363)	363
Balance at (in shares) at Oct. 31, 2018	7,972,686			7,972,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of foreign currency translation	$ (133)
Net loss attributable to FuelCell Energy, Inc.	(37,078)
Balance at at Apr. 30, 2019	$ 49,835			$ 1	1,084,969			(1,034,599)	(536)	(466)	466
Balance at (in shares) at Apr. 30, 2019	13,709,330			13,709,330
Balance at at Jan. 31, 2019	$ 58,854			$ 1	1,074,318			(1,015,069)	(396)	(363)	363
Balance at (in shares) at Jan. 31, 2019				9,034,605
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued, non-employee compensation	102				102
Common stock issued, non-employee compensation, (in shares)				29,454
Share based compensation	955				955
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans	(219)				(219)
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares)				52,784
Series A warrant exchange, (in shares)				500,000
Series C convertible preferred stock conversions	10,355				10,355
Series C convertible preferred stock conversions, (in shares)				2,127,528
Series D convertible preferred stock conversions	6,305				6,305
Series D convertible preferred stock conversions, (in shares)				1,994,413
Convertible preferred stock redemption accretion			$ (6,047)				$ (6,047)
Preferred stock dividends	(800)				(800)
Effect of foreign currency translation	(140)								(140)
Adjustment for deferred compensation											103
Adjustment for deferred compensation, (in shares)				(29,454)
Adjustment for deferred compensation										(103)
Net loss attributable to FuelCell Energy, Inc.	(19,530)							(19,530)
Balance at at Apr. 30, 2019	$ 49,835			$ 1	$ 1,084,969			$ (1,034,599)	$ (536)	$ (466)	$ 466
Balance at (in shares) at Apr. 30, 2019	13,709,330			13,709,330

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities:
Net loss	$ (37,078)	$ (17,357)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	1,940	1,378
Loss from change in fair value of embedded derivatives	26	45
Depreciation	4,398	4,302
Non-cash interest expense on preferred stock and debt obligations	2,575	2,845
Unrealized foreign exchange gains	(329)	(367)
Deferred income taxes	0	(3,035)
Impairment of property, plant and equipment	2,840	0
Project asset impairment	0	485
Other non-cash transactions, net	126	203
(Increase) decrease in operating assets:
Accounts receivable	(2,171)	25,798
Unbilled receivables	(3,490)	(1,419)
Inventories	(3,468)	30,981
Other assets	560	(1,382)
Increase (decrease) in operating liabilities:
Accounts payable	8,982	3,290
Accrued liabilities	2,228	(4,238)
Deferred revenue	4,664	386
Net cash (used in) provided by operating activities	(18,197)	41,915
Cash flows from investing activities:
Capital expenditures	(2,091)	(5,506)
Project asset expenditures	(27,275)	(21,749)
Net cash used in investing activities	(29,366)	(27,255)
Cash flows from financing activities:
Repayment of debt	(4,791)	(10,919)
Proceeds from debt	28,322	13,091
Payment of deferred financing costs	(1,283)	(352)
Payment of preferred dividends and return of capital	(1,840)	(2,096)
Common stock issued for stock plans and related expenses	31	0
Proceeds from sale of common stock and warrant exercises, net	0	3,268
Net cash provided by financing activities	20,439	2,992
Effects on cash from changes in foreign currency rates	(133)	87
Net (decrease) increase in cash, cash equivalents and restricted cash	(27,257)	17,739
Cash, cash equivalents and restricted cash-beginning of period	80,239	87,448
Cash, cash equivalents and restricted cash-end of period	52,982	105,187
Supplemental cash flow disclosures:
Cash interest paid	1,638	1,144
Noncash financing and investing activity:
Net noncash reclass of project assets to inventory	0	11,740
Accrued purchase of fixed assets, cash paid in subsequent period	35	273
Accrued purchase of project assets, cash paid in subsequent period	893	1,504
Series C Preferred Stock [Member]
Noncash financing and investing activity:
Series C preferred share conversions	12,329	15,598
Series C preferred share modification	6,047	0
Series D Preferred Stock [Member]
Noncash financing and investing activity:
Series C preferred share conversions	$ 10,639	$ 0

Nature of Business and Basis of

Nature of Business and Basis of Presentation	6 Months Ended
	Apr. 30, 2019
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 with a growing global presence. We design, manufacture, install, operate and service ultra-clean, efficient and reliable stationary fuel cell power plants. Our SureSource power plants generate electricity and usable high quality heat for commercial, industrial, government and utility customers. We have commercialized our stationary carbonate fuel cells and are also pursuing the complementary development of planar solid oxide fuel cells and other fuel cell technologies. Our operations are funded primarily through sales of equity instruments to strategic investors or in public markets, corporate and project level debt financing and local or state government loans or grants. In order to produce positive cash flow from operations, we need to be successful at increasing annual order volume and production and in our cost reduction efforts. 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, 2019 and 2018 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, 2018 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, 2018, 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. On May 8, 2019 at 5:00 p.m. Eastern time, the Company effected a 1-for-12 reverse stock split, reducing the number of the Company’s common shares outstanding on that date from 183,411,230 shares to 15,284,269 shares. The number of authorized shares of common stock remains unchanged at 225,000,000 shares and the number of authorized shares of preferred stock remains unchanged at 250,000 shares. Additionally, the conversion rate of our Series B Preferred Stock (as defined elsewhere herein), the conversion price of our Series C Preferred Stock and Series D Preferred Stock (each as defined elsewhere herein), the exchange price of our Series 1 Preferred Shares (as defined elsewhere herein), the exercise price of all outstanding options and warrants, and the number of shares reserved for future issuance pursuant to our equity compensation plans were all adjusted proportionately in connection with the reverse stock split. All share and per share amounts and conversion prices presented herein have been adjusted retroactively to reflect these changes. Certain reclassifications have been made to the prior year amounts to conform to the current year presentation. The Company adopted Accounting Standards Update ("ASU") 2014-09, "Revenue from Contracts with Customers (Topic 606)" effective November 1, 2018 and applied the modified retrospective transition method. As a result of the adoption of this ASU, Unbilled receivables has been reclassified as a separate line item from Accounts receivable, net on the Consolidated Balance Sheets and Unbilled receivables has been classified as a separate item from Accounts receivable, net in the Consolidated Statement of Cash Flows for the prior year period. Going Concern and Liquidity Considerations The Company’s consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities and commitments in the normal course of business. The Company has significant short-term debt and other obligations currently due or maturing in less than one year, which are in excess of the Company’s cash and current asset balance, and the Company has been delaying certain payments to conserve cash. The Company has entered into a series of amendments to its senior secured debt facility with its senior lender Hercules Capital, Inc. (“Hercules”) in order to, among other things, provide for a lower minimum cash covenant and avoid events of default and acceleration of amounts due under the loan agreement. Most recently, Hercules provided an amendment through August 9, 2019. In exchange for this new amendment, the Company has agreed to pay down a portion of the outstanding principal amount in June 2019 as described below. The Company also has entered into amendments of its loan facility with NRG Energy Inc. (“NRG”) in order to extend the maturity date of the loan to July 12, 2019 as described below. Management has plans to address the Company’s current liquidity positon. These plans include exploring refinancing alternatives for the Company’s senior secured credit facility with Hercules. However, the Company may not be able to obtain such refinancing on acceptable terms, or at all. If the Company is not able to consummate such a refinancing transaction by August 9, 2019, and if Hercules is not willing to provide further accommodations, the Company could default on its obligations under its senior secured credit facility with Hercules. The occurrence of an event of default under the Hercules Agreement also constitute or may result in an event of default under, and cause or may cause the acceleration of, a number of material financial obligations including the State of Connecticut loan, the Connecticut Green Bank Loan and the Generate Lending, PNC and Fifth Third project finance facilities. The Company also has obtained an amendment of the loan agreement with NRG that has a maturity date of July 12, 2019. Management plans to continue to pursue project financing for the Company’s generation backlog. If the Company is unable to obtain such project financing, it may have events of default under its project finance agreements, which are further described in Note 15, “Debt and Financing Obligation.” Refer to Note 18, “Subsequent Events” for further information regarding the EMRE License Agreement The terms of any financing and other measures to obtain funds that may be undertaken by the Company may adversely affect the holdings or the rights of the Company’s stockholders. If the Company is unable to obtain funding, the Company could be forced to delay, reduce or eliminate some or all of its research and development efforts and commercialization efforts and sell intellectual property and other assets, which could adversely affect its business prospects, or the Company may be unable to continue operations. Although management continues to pursue these plans, there is no assurance that the Company will be successful in obtaining sufficient funding on terms acceptable to the Company to fund continuing operations, if at all. If the Company is unable to obtain external financing, it may not be able to sustain future operations. As a result, the Company may be required to delay, reduce and/or cease its operations and/or seek bankruptcy protection. Based on its recurring losses from operations, expectation of continuing operating losses for the foreseeable future, negative working capital, and need to raise additional capital to finance its future operations, the Company has concluded that there is substantial doubt about its ability to continue as a going concern for a period of one year after the date of filing of this Quarterly Report on Form 10-Q. The Company’s financial statements do not include any adjustments that might result from the outcome of this uncertainty. Accordingly, the financial statements have been prepared on a basis that assumes the Company will continue as a going concern and which contemplates the realization of assets and satisfaction of liabilities and commitments in the ordinary course of business. 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 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), income taxes 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.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Apr. 30, 2019
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	Note 2. Recent Accounting Pronouncements Recently Adopted Accounting Guidance In May 2014, the Financial Accounting Standards Board (the “FASB”) issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)”. The objective of this ASU is to remove inconsistent practices with regard to revenue recognition in and between US GAAP and International Financial Reporting Standards. ASU 2014-09 intends to improve comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets. The adoption of this ASU on November 1, 2018 resulted in a cumulative effect adjustment that increased Accumulated deficit by $6.7 million. Recent Accounting Guidance Not Yet Effective In February 2016, the FASB issued ASU 2016-02, “Leases” which, for operating leases, requires a lessee to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in its balance sheet. The standard also requires a lessee to recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term, generally on a straight-line basis. This ASU is effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years (which, for the Company, will be the first quarter of fiscal year 2020). Early adoption is permitted. The Company has both operating and capital leases (refer to Note 17. “Commitments and Contingencies”) as well as sale-leasebacks accounted for under the finance method and may have other arrangements that contain embedded leases as characterized in this ASU. The Company expects that adoption of this ASU will result in the recognition of right-of-use assets and lease liabilities not currently recorded in its consolidated financial statements under existing accounting guidance. However, the Company is still evaluating all of its contractual arrangements and the impact that adoption of ASU 2016-02 will have on the Company’s consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” which provides for a one-step quantitative impairment test, whereby a goodwill impairment loss will be measured as the excess of a reporting unit’s carrying amount over its fair value (not to exceed the total goodwill allocated to that reporting unit). It eliminates Step 2 of the current two-step goodwill impairment test, under which a goodwill impairment loss is measured by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The standard is effective, on a prospective basis for interim and annual periods beginning after December 15, 2019, with early adoption permitted. The Company adopted this ASU effective November 1, 2018. The adoption of this ASU did not have an impact on the Company’s consolidated financial statements.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Apr. 30, 2019
Revenue From Contract With Customer [Abstract]
Revenue Recognition	Note 3. Revenue Recognition Under Accounting Standards Codification (ASC) Topic 606: Revenue from Contracts with Customer (“Topic 606”) A contract is accounted for when there has been approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Performance obligations under a contract are identified based on the goods or services that will be transferred to the customer that are both capable of being distinct and are distinct in the context of the contract. In certain instances, the Company has concluded distinct goods or services should be accounted for as a single performance obligation that is a series of distinct goods or services that have the same pattern of transfer to the customer. To the extent a contract includes multiple promised goods or services, the Company must apply judgment to determine whether the customer can benefit from the goods or services either on their own or together with other resources that are readily available to the customer (the goods or services are distinct) and if the promise to transfer the goods or services to the customer is separately identifiable from other promises in the contract (the goods or services are distinct in the context of the contract). If these criteria are not met, the promised services are accounted for as a single performance obligation. The transaction price is determined based on the consideration that the Company will be entitled to in exchange for transferring goods or services to the customer. To the extent the transaction price includes variable consideration, the Company estimates the amount of variable consideration that should be included in the transaction price, generally utilizing the expected value method. Determining the transaction price requires judgment. If the contract contains a single performance obligation, the entire transaction price is allocated to the single performance obligation. Contracts that contain multiple performance obligations require an allocation of the transaction price to each performance obligation based on a relative standalone selling price basis. Standalone selling price is determined by the price at which the performance obligation is sold separately. If the standalone selling price is not observable through past transactions, the Company estimates the standalone selling price by taking into account available information such as market conditions and internally approved pricing guidelines related to the performance obligations. Performance obligations are satisfied either over time or at a point in time as discussed in further detail below. In addition, the Company's contracts with customers generally do not include significant financing components or non-cash consideration. Revenue streams are classified as follows: Product. Includes the sale of completed project assets, sale and installation of fuel cell power plants including site engineering and construction services, and the sale of modules, balance of plant (“BOP”) components and spare parts to customers. Service. Includes performance under long-term service agreements for power plants owned by third parties. License and royalty. Includes license fees and royalty income from manufacturing and technology transfer agreements. Generation. Includes the sale of electricity under PPAs and utility tariffs from project assets retained by the Company. This also includes revenue received from the sale of other value streams from these assets including the sale of heat, steam, capacity and renewable energy credits. Advanced Technologies. Includes revenue from customer-sponsored and government-sponsored Advanced Technologies projects. See below for discussion of revenue recognition under Topic 606 by disaggregated revenue stream, including a comparison to revenue recognition treatment under ASC 605, Revenue Recognition Completed project assets Contracts for the sale of completed project assets includes the sale of the project asset, the assignment of the service agreement, and the assignment of the PPA. The relative stand-alone selling price is estimated and is used as the basis for allocation of the contract consideration. Revenue is recognized upon the satisfaction of the performance obligations, which includes the transfer of control of the project asset to the customer, which is when the contract is signed and the PPA is assigned to the customer. See below for further discussion regarding revenue recognition for service agreements. The revenue recognition for completed project assets under Topic 606 is consistent with treatment under ASC 605. Contractual payments related to the sale of the project asset and assignment of the PPA are generally received up-front. Payment terms for service agreements are generally ratable over the term of the agreement. Service agreements Service agreements represent a single performance obligation whereby the Company performs all required maintenance and monitoring functions, including replacement of modules, to ensure the power plant(s) under the service agreement generate a minimum power output. To the extent the power plant(s) under service agreements do not achieve the minimum power output, certain service agreements include a performance guarantee penalty. Performance guarantee penalties represent variable consideration, which is estimated for each service agreement based on past experience, using the expected value method. The net consideration for each service agreement is recognized using costs incurred to date relative to total estimated costs at completion to measure progress. Under ASC 605, revenue for service agreements was generally recorded ratably over the term of the service agreement, as the performance of routine monitoring and maintenance under the service agreements was expected to be incurred on a straight-line basis. If there was an estimated module exchange during the term, the costs of performance were not expected to be incurred on a straight-line basis, and therefore a portion of the initial contract value relating to the module exchange was deferred and recognized upon such module replacement event. Prior to the implementation of Topic 606, an estimate for a performance guarantee was not recorded until a performance issue occurred at a particular power plant. At that point, the actual power plant’s output was compared against the minimum output guarantee and an accrual was recorded. Furthermore, under ASC 605, performance guarantee accruals were recorded based on actual performance and the related expense was recorded to service and license cost of revenues. The review of power plant performance was updated for each reporting period to incorporate the most recent performance of the power plant and minimum output guarantee payments made to customers, if applicable. The Company reviews its cost estimates on service agreements on a quarterly basis and records any changes in estimates on cumulative catch-up basis. Loss accruals for service agreements are recognized to the extent that the estimated remaining costs to satisfy the performance obligation exceed the estimated remaining unrecognized net consideration. Estimated losses are recognized in the period in which losses are identified. The Company records any amounts that are billed to customers in excess of revenue recognized as deferred revenue and revenue recognized in excess of amounts billed to customers as unbilled receivables. Payment terms for service agreements are generally ratable over the term of the agreement. Advanced Technologies contracts Advanced Technologies contracts include the promise to perform research and development services and as such this represents one performance obligation. Revenue from most government sponsored Advanced Technologies projects is recognized as direct costs are incurred plus allowable overhead less cost share requirements, if any. Revenue is only recognized to the extent the contracts are funded. Revenue from fixed price Advanced Technologies projects is recognized using the cost to cost input method. There was no impact of adoption of Topic 606 on revenue recognition for Advanced Technologies contracts. The Company records any amounts that are billed to customers, in excess of revenue recognized as deferred revenue and revenue recognized in excess of amounts billed to customers as unbilled receivables. Payments are based on costs incurred for government sponsored Advanced Technologies projects and upon completion of milestones for all other projects. License agreements The Company entered into manufacturing and technology transfer agreements (the “license agreements”) with POSCO Energy Co., Ltd. (“POSCO Energy”) in 2007, 2009 and 2012. Revenue from the license fees received from POSCO Energy were previously recognized over the term of the associated agreements. In connection with the adoption of Topic 606, several performance obligations were identified including previously satisfied performance obligations for the transfer of licensed intellectual property, two performance obligations for specified upgrades of the previously licensed intellectual property, a performance obligation to deliver unspecified upgrades to the previously licensed intellectual property on a when and if available basis, and a performance obligation to provide technical support for previously delivered intellectual property. The performance obligations related to the specified upgrades will be satisfied and related consideration recognized as revenue upon the delivery of the specified upgrades. The performance obligations for unspecified upgrades and technical support are being recognized on a straight-line basis over the license term on the basis this represents the method that best depicts the progress towards completion of the related performance obligations. All fixed consideration for the license agreement was previously collected. Generation revenue For project assets where customers purchase electricity from the Company under PPAs, the Company has determined that these agreements should be accounted for as operating leases pursuant to ASC 840, Leases Payments for electricity are made after the electricity has been delivered. The cumulative effect of the changes made to the Company’s Consolidated Balance Sheets as of November 1, 2018 as a result of the adoption of Topic 606 was as follows: October 31, 2018 Adjustments due to Topic 606 Balance at November 1, 2018 ASSETS Unbilled receivables $ 13,759 $ 471 $ 14,230 Other assets 13,505 (132 ) 13,373 LIABILITIES Accrued liabilities $ 7,632 $ 995 $ 8,627 Deferred revenue, current portion 11,347 (240 ) 11,107 Long-term deferred revenue 16,793 6,238 23,031 EQUITY Accumulated deficit $ (990,867 ) $ (6,654 ) $ (997,521 ) The increase in long-term deferred revenue primarily pertains to license arrangement consideration previously recognized as revenue under ASC 605 that will be recognized when the specified upgrade performance obligations are satisfied. The following tables summarize the impacts of Topic 606 on the Company’s consolidated financial statements. April 30, 2019 As reported Adjustments Balances without adoption of Topic 606 ASSETS Unbilled receivables $ 11,078 $ (342 ) $ 10,736 Other assets 20,251 (626 ) 19,625 LIABILITIES Accrued liabilities $ 10,954 $ (1,509 ) $ 9,445 Deferred revenue 16,331 (886 ) 15,445 Long-term deferred revenue 22,470 (6,696 ) 15,774 EQUITY Accumulated deficit $ (1,034,599 ) $ 8,123 $ (1,026,476 ) For the Three Months Ended April 30, 2019 As reported Adjustments Balances without adoption of Topic 606 Total revenues $ 9,216 $ 792 $ 10,008 Total cost of revenues 12,856 767 13,623 Gross loss (3,640 ) 25 (3,615 ) Administrative and selling expenses 9,805 — 9,805 Research and development expenses 4,178 — 4,178 Loss from operations (17,623 ) 25 (17,598 ) Interest expense (1,807 ) — (1,807 ) Other expense, net (31 ) — (31 ) Loss before provision for income taxes (19,461 ) 25 (19,436 ) Provision for income taxes (69 ) — (69 ) Net loss $ (19,530 ) $ 25 $ (19,505 ) For the Six Months Ended April 30, 2019 As reported Adjustments Balances without adoption of Topic 606 Total revenues $ 26,999 $ 2,340 $ 29,339 Total cost of revenues 32,844 1,042 33,886 Gross loss (5,845 ) 1,298 (4,547 ) Administrative and selling expenses 16,564 — 16,564 Research and development expenses 10,458 — 10,458 Loss from operations (32,867 ) 1,298 (31,569 ) Interest expense (4,271 ) — (4,271 ) Other income, net 129 — 129 Loss before provision for income taxes (37,009 ) 1,298 (35,711 ) Provision for income taxes (69 ) — (69 ) Net loss $ (37,078 ) $ 1,298 $ (35,780 ) For the three and six month periods ended April 30, 2019, the only adjustment to comprehensive loss when comparing the balances with Topic 606 and the balances without Topic 606 included the adjustment to net loss. For the six month period ended April 30, 2019, the impact of adoption of Topic 606 on the Consolidated Statement of Cash Flows included an adjustment to net loss of $1.3 million and adjustments to changes in operating assets and liabilities consistent with the impact of adoption of Topic 606 on the April 30, 2019 Consolidated Balance Sheet as reflected above. Contract Balances Contract assets as of April 30, 2019 and October 31, 2018 were $25.5 million and $23.2 million, respectively. The contract assets relate to the Company’s rights to consideration for work completed 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 recorded as revenue offset by customer billings. A total of $4.1 million was transferred to accounts receivable from contract assets recognized at the beginning of the period. Contract liabilities as of April 30, 2019 and October 31, 2018 were $38.8 million and $28.1 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. These amounts are included within Deferred revenue and Long-term deferred revenue on the accompanying consolidated balance sheets. The net change in contract liabilities represents customer billings offset by revenue recorded. 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, 2019, the Company’s total remaining performance obligations for service agreements, license agreements and Advanced Technologies contracts were $321.6 million. License revenue recognized over time will be recognized over the remaining term of the license agreement. License revenue recognized at a point in time will be recognized when the first specified upgrade that has been developed is delivered and the second specified upgrade when it is developed and delivered. Service revenue in periods where there are no module replacements is expected to be relatively consistent from period to period whereas module replacements will result in an increase in revenue. Advanced Technologies revenue will be recognized as costs are incurred.

Restructuring and Impairment

Restructuring and Impairment	6 Months Ended
	Apr. 30, 2019
Restructuring Costs [Abstract]
Restructuring and Impairment	Note 4. Restructuring and Impairment On April 12, 2019, the Company undertook a reorganization, which included a reduction in force of 135 employees, which represented 30% of the Company’s global workforce. The workforce was reduced at the North American production facility in Torrington, Connecticut, as well as at corporate offices in Danbury, Connecticut and at remote locations. There was no restructuring expense recorded because no severance was provided in connection with the reduction in force. The Company has also reduced its materials spend and is implementing various cost control initiatives. In connection with the reorganization, the Company also reviewed certain construction in process projects and identified a non-commercial construction in process asset related to automation equipment for use in manufacturing which has been determined to be impaired due to uncertainty as to whether the asset will be completed as a result of the Company’s liquidity position and continued low level of production rates. The Company recorded a charge of $2.8 million which is included in Product cost of revenues on the Consolidated Statements of Operations for the three and six months ended April 30, 2019.

Accounts Receivable, Net and Un

Accounts Receivable, Net and Unbilled Receivables	6 Months Ended
	Apr. 30, 2019
Receivables [Abstract]
Accounts Receivable, Net and Unbilled Receivables	Note 5. Accounts Receivable, Net and Unbilled Receivables Accounts receivable, net and Unbilled receivables as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Commercial Customers: Amount billed $ 10,626 $ 7,415 Unbilled receivables (1) 10,114 10,632 20,740 18,047 Advanced Technologies (including U.S. government (2) Amount billed 1,216 1,865 Unbilled receivables 964 3,127 2,180 4,992 Accounts receivable, net and unbilled receivables $ 22,920 $ 23,039 (1) Additional long-term unbilled receivables of $14.4 million and $9.4 million are included within “Other Assets” as of April 30, 2019 and October 31, 2018, respectively. (2) Total U.S. government accounts receivable, including unbilled receivables, outstanding as of April 30, 2019 and October 31, 2018 were $0.8 million and $2.3 million, respectively. Accounts receivable are presented net of an allowance for doubtful accounts of $0.2 million as of October 31, 2018. There was no allowance for doubtful accounts as of April 30, 2019. 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
	Apr. 30, 2019
Inventory Disclosure [Abstract]
Inventories	Note 6. Inventories Inventories as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Raw materials $ 25,228 $ 24,467 Work-in-process (1) 31,815 29,108 Inventories $ 57,043 $ 53,575 (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, power plant orders or for use under the Company’s service agreements. Included in work-in-process as of April 30, 2019 and October 31, 2018 was $21.2 million and $19.0 million, respectively, of completed standard components. 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 balance of plant components, fuel cell stacks and modules, which are all subcomponents of a power plant. The Company incurred excess plant capacity and manufacturing variances of $3.4 million and $3.2 million for the three months ended April 30, 2019 and 2018, respectively, and $6.6 million and $5.5 million for the six months ended April 30, 2019 and 2018, respectively, which were included within product cost of revenues on the consolidated statements of operations.

Project Assets

Project Assets	6 Months Ended
	Apr. 30, 2019
Project Assets [Abstract]
Project Assets	Note 7. Project Assets Project assets as of April 30, 2019 and October 31, 2018 were $123.1 million and $99.6 million, respectively. Project assets as of April 30, 2019 and October 31, 2018 included five completed, commissioned installations generating power with respect to which the Company has a PPA with the end-user of power and site host with an aggregate carrying value of $26.1 million and $28.6 million as of April 30, 2019 and October 31, 2018, respectively. Certain of these assets are the subject of sale-leaseback arrangements with PNC Energy Capital, LLC (“PNC”), which are accounted for under the financing method. The Project assets balance as of April 30, 2019 and October 31, 2018 also includes assets with an aggregate value of $97.0 million and $71.0 million, respectively, which are being developed and constructed by the Company under existing PPAs that have not been placed in service. Project construction costs incurred for the 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 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 15, “Debt and Financing Obligation” for more information).

Other Current Assets

Other Current Assets	6 Months Ended
	Apr. 30, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Other Current Assets	Note 8. Other Current Assets Other current assets as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Advance payments to vendors (1) $ 1,565 $ 2,696 Deferred finance costs (2) 56 97 Prepaid expenses and other (3) 6,047 5,799 Other current assets $ 7,668 $ 8,592 (1) Advance payments to vendors relate to payments for inventory purchases ahead of receipt. (2) The April 30, 2019 balance represents direct deferred finance costs for securing the $100.0 million credit facility with Generate Lending, LLC which are being amortized over a one-year period and the October 31, 2018 balance represents direct deferred finance costs relating to securing the $40.0 million loan facility with NRG, which were being amortized over the five-year life of the facility. (3) Primarily relates to other prepaid expenses including insurance, rent and lease payments.

Other Assets

Other Assets	6 Months Ended
	Apr. 30, 2019
Other Assets Noncurrent [Abstract]
Other Assets	Note 9. Other Assets Other assets as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Long-term stack residual value (1) $ 987 $ 1,206 Long-term unbilled receivables (2) 14,373 9,385 Other (3) 4,891 2,914 Other assets $ 20,251 $ 13,505 (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 twelve months from the balance sheet date. ( 3 ) The Company entered into an agreement with one of its customers on June 29, 2016 that includes a fee for the purchase of the power plants at the end of the term of the agreement. The fee is payable in installments over the term of the agreement and the total paid as of April 30, 2019 and October 31, 2018 was $2.3 million and $2.0 million, respectively. Also included within “Other” are long-term security deposits and as of April 30, 2019, prepaid withholding taxes on deferred revenue.

Accrued Liabilities

Accrued Liabilities	6 Months Ended
	Apr. 30, 2019
Accrued Liabilities Current [Abstract]
Accrued Liabilities	Note 10. Accrued Liabilities Accrued liabilities as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Accrued payroll and employee benefits $ 2,599 $ 2,550 Accrued product warranty cost (1) 65 147 Accrued service agreement costs (2) 4,267 2,029 Accrued legal, taxes, professional and other 4,023 2,906 Accrued liabilities $ 10,954 $ 7,632 (1) Activity in the accrued product warranty costs for the six months ended April 30, 2019 represents reductions related to actual warranty spend of $0.08 million as contracts progress through the warranty period or are beyond the warranty period. ( 2 ) The loss accruals on service contracts were $0.9 million as of October 31, 2018 which increased to $1.9 million as of April 30, 2019. The accruals for performance guarantees increased from $1.1 million as of October 31, 2018 to $2.4 million as of April 30, 2019. The changes in the accruals are a result of the impact of the adoption of Topic 606.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Apr. 30, 2019
Equity [Abstract]
Stockholders' Equity	Note 11. Stockholders’ Equity At Market Issuance Sales Agreement On June 13, 2018, the Company entered into an At Market Issuance Sales Agreement (the “Sales Agreement”) with B. Riley FBR, Inc. and Oppenheimer & Co. Inc. (together, the “Agents”) to create an at the market equity program under which the Company from time to time may offer and sell shares of its common stock having an aggregate offering price of up to $50.0 million through the Agents. Under the Sales Agreement, the Agent making the sales will be entitled to a commission in an amount equal to 3.0% of the gross proceeds from such sales. There were no sales under the Sales Agreement during the six months ended April 30, 2019. As the Company has only sold $8.0 million of shares of common stock under the Sales Agreement as of April 30, 2019, it may sell up to approximately $42.0 million of shares in the future under the Sales Agreement, which is subject to contractual requirements, trading windows and market conditions Public Offerings and Outstanding Warrants On May 3, 2017, the Company completed an underwritten public offering of (i) 1,000,000 shares of its common stock, (ii) Series C warrants to purchase 1,000,000 shares of its common stock and (iii) Series D warrants to purchase 1,000,000 shares of its common stock. The Series C warrants have an exercise price of $19.20 per share and a term of five years. The Series D warrants were all exercised prior to October 31, 2018. No Series C warrants were exercised during the six months ended April 30, 2019. On July 12, 2016, the Company closed on a registered public offering of securities to a single institutional investor pursuant to a placement agent agreement with J.P. Morgan Securities LLC. In conjunction with the offering, the Company issued a Series A warrant to purchase 640,000 shares of the Company’s common stock (the “Series A Warrant”) with an exercise price of $69.96 per share. On February 21, 2019, the Company entered into an Exchange Agreement (the “Exchange Agreement”) with the holder (the “Warrant Holder”) of the Series A Warrant. Pursuant to the Exchange Agreement, the Company agreed to issue to the Warrant Holder 500,000 shares of the Company’s common stock (subject to adjustment for stock dividends, stock splits, stock combinations, and other reclassifications) in exchange for the transfer of the Series A Warrant back to the Company, in reliance on an exemption from registration provided by Section 3(a)(9) of the Securities Act of 1933, as amended. Following the transfer of the Series A Warrant back to the Company, the Series A Warrant was cancelled and no further shares are issuable pursuant to the Series A Warrant. For the three and six months ended April 30, 2019, the Company recorded a charge to common stockholders for the difference between the fair value of the Series A Warrant prior to the modification of $0.3 million and the fair value of the common shares issuable at the date of the Exchange Agreement of $3.5 million. The following table summarizes outstanding warrant activity during the six months ended April 30, 2019: Series A Warrants Series C Warrants Balance as of October 31, 2018 640,000 964,114 Warrants exchanged (640,000 ) — Warrants exercised — — Warrants expired — — Balance as of April 30, 2019 — 964,114

Redeemable Preferred Stock

Redeemable Preferred Stock	6 Months Ended
	Apr. 30, 2019
Preferred Stock [Abstract]
Redeemable Preferred Stock	Note 12. 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 shares are currently issued and designated as Series D Convertible Preferred Stock (referred to herein as “Series D Preferred Stock”), Series C Convertible Preferred Stock (referred to herein as “Series C Preferred Stock”) and 5% Series B Cumulative Convertible Perpetual Preferred Stock (referred to herein as “Series B Preferred Stock”). Series D Preferred Stock On August 27, 2018, the Company entered into an underwriting agreement (the “Underwriting Agreement”) with Oppenheimer & Co. Inc. (the “Underwriter”), relating to an underwritten offering (the “Offering”) of the Company’s Series D Preferred Stock with a par value of $0.01 per share. Subject to the terms and conditions contained in the Underwriting Agreement, the Underwriter agreed to purchase, and the Company agreed to sell, 30,680 shares of Series D Preferred Stock, which were initially convertible into 1,852,657 shares of the Company’s common stock (without regard to any limitation on conversion set forth in the Certificate of Designations, Preferences and Rights of the Series D Preferred Stock of the Company (the “Series D Certificate of Designation”)), at an initial conversion price of $16.56 per share, subject to certain adjustments (“Series D Conversion Price”). The Offering closed on August 29, 2018. The net proceeds to the Company from the sale of the Series D Preferred Stock, after deducting the underwriting discounts and commissions and the offering expenses payable by the Company, were approximately $25.3 million. In conjunction with the closing of the Offering, on August 29, 2018, the Company filed the Series D Certificate of Designation with the Secretary of State of the State of Delaware, designating 30,680 shares of the Company’s preferred stock as Series D Convertible Preferred Stock (such shares, the “Series D Preferred Shares”) and establishing the rights, preferences, privileges, qualifications, restrictions, and limitations relating to the Series D Preferred Stock, as described below. As of April 30, 2019 and October 31, 2018, there were 18,462 and 30,680 During the three and six months ended April 30, 2019, holders of the Series D Preferred Stock converted 6,964 and 12,218 Series D Preferred Shares into 1,994,413 and 2,926,557 shares of common stock, respectively, through installment conversions and acceleration of future installment amounts resulting in a reduction of $6.3 million and $10.6 million, respectively, to the carrying value being recorded to equity. Installment conversions in which the conversion price was below (the conversion price of the Series D Preferred Stock The deemed dividends represent the difference between the fair value of the shares of common stock issued to settle the installment amounts and the carrying value of the Series D Preferred Shares The Series D Preferred Stock redemption accretion of $3.8 million for the six months ended April 30, 2019 reflects the accretion of the difference between the carrying value and the amount that would have been redeemed if stockholder approval had not been obtained for common stock issuance equal to 20.0% or more of the Company’s outstanding voting stock prior to the issuance of the Series D Preferred Stock. Additionally, prior to receiving stockholder approval of the issuance of 20.0% or more of the Company’s outstanding voting stock immediately preceding the issuance of the Series D Preferred Stock, the holders were prohibited from converting Series D Preferred Shares into shares of common stock if such conversion would have caused the Company to issue pursuant to the terms of the Series D Preferred Stock a number of shares in excess of the maximum number of shares permitted to be issued thereunder without breaching the Company’s obligations under the rules or regulations of Nasdaq. The Company received stockholder approval of such issuance at the annual meeting of the Company’s stockholders on April 4, 2019. Based on review of pertinent accounting literature including ASC 470 – Debt - Distinguishing Liabilities from Equity Derivative and Hedging Any failure to pay any amounts due to the holders of the Series D Preferred Shares, as well as certain other “triggering events,” including, without limitation, the Company’s failure to timely deliver shares, the suspension of trading of the Company’s common stock, the Company’s failure to keep reserved for issuance an adequate number of shares of common stock to cover conversion of the Series D Preferred Shares, breaches of certain agreements that permit the other party to such agreement to declare a default or accelerate amounts due, the existence of a circumstance or event that would result in a default under another agreement that would or is reasonably expected to have a material adverse effect, Alternatively, in the event of such a triggering event, the holders of Series D Preferred Shares may elect to convert such shares (subject to the beneficial ownership limitations provided in the Series D Certificate of Designation) into shares of common stock at a conversion price equal to the lower of the Series D Conversion Price in effect on the Trading Day (as such term is defined in the Series D Certificate of Designation) immediately preceding the delivery of the conversion notice and 85% of the lowest VWAP of the common stock on any of the five consecutive Trading Days ending on the Trading Day immediately prior to delivery of the applicable conversion notice. A description of certain terms and provisions of the Series D Preferred Shares is as follows: Conversion Right. The Series D Preferred Shares are convertible into shares of the Company’s common stock, subject to the beneficial ownership limitation provided in the Series D Certificate of Designation, at a conversion price equal to $16.56 per share of common stock, subject to adjustment as provided in the Series D Certificate of Designation, including adjustments if the Company sells shares of common stock or equity securities convertible into or exercisable for shares of common stock, at prices below $16.56 per share, in certain types of transactions. The Series D Conversion Price is subject to adjustment under certain circumstances in accordance with the Series D Certificate of Designation, including the following: • The conversion price may be proportionately reduced in the event of a subdivision of the Company’s common stock into a greater number of shares or proportionately increased in the event of a combination of the Company’s common stock into a smaller number of shares. • In the event that the Company in any manner issues or sells or enters into any agreement to issue or sell Variable Price Securities (as defined in the Series D Certificate of Designation), which generally includes any common stock, options or convertible securities that are issuable at a price which varies or may vary with the market price of the shares of common stock, including by way of one or more reset(s) to a fixed price, but excluding customary anti-dilution provisions (each of the formulations for such variable price being referred to as, the “Variable Price”), each holder of Series D Preferred Shares will have the right (in its sole discretion) to substitute the Variable Price for the Conversion Price upon conversion of the Series D Preferred Shares. Sales of common stock pursuant to the Company’s Sales Agreement will be deemed Variable Price Securities with a Variable Price equal to the lowest price per share at which common stock is sold pursuant to that agreement. Under the Series D Certificate of Designation, the term “options” means any rights, warrants or options to subscribe for or purchase shares of common stock or convertible securities, and the term “convertible securities” means any stock or other security (other than options) that is at any time and under any circumstances, directly or indirectly, convertible into, exercisable or exchangeable for, or which otherwise entitles the holder thereof to acquire, any shares of common stock. • At any time any Series D Preferred Shares remain outstanding, the Company may reduce the then current conversion price to any amount for any period of time deemed appropriate by the Company’s board of directors. • The Series D Conversion Price or redemption amounts paid by the Company may also be adjusted upon the occurrence of certain triggering events as set forth in the Series D Certificate of Designation and summarized below under “Conversion Upon a Triggering Event” and “Redemption Upon a Triggering Event.” Refer to Note 18. “Subsequent Events” for information on the occurrence of triggering events subsequent to April 30, 2019. Conversion Upon a Triggering Event. Subject to the beneficial ownership limitations provided in the Series D Certificate of Designation, in the event of a triggering event (as defined in the Series D Certificate of Designation and summarized below), the holders of Series D Preferred Shares may elect to convert such shares into shares of common stock at a conversion price equal to the lower of the Series D Conversion Price in effect on the Trading Day (as such term is defined in the Series D Certificate of Designation) immediately preceding the delivery of the conversion notice and 85% of the lowest VWAP of the common stock on any of the five consecutive Trading Days ending on the Trading Day immediately prior to delivery of the applicable conversion notice. This conversion right commences on the date of the triggering event and ends on the later of (i) the date the triggering event is cured and (ii) ten Trading Days after the Company delivers notice of the triggering event. A triggering event (as defined in the Series D Certificate of Designation) includes, without limitation: • any failure to pay any amounts due to the holders of the Series D Preferred Shares; • the Company’s failure to timely deliver shares; • the suspension of the Company’s common stock from trading or failure to be trading or listed on The Nasdaq Global Market, without obtaining a listing on another national securities exchange, for a period of five consecutive Trading Days; • subject to limited exceptions, the Company’s failure for more than ten consecutive days to keep reserved for issuance 150% of the number of shares of common stock issuable upon conversion of the outstanding Series D Preferred Shares; • certain bankruptcy events; • the failure to pay certain indebtedness, a breach or violation of an agreement for monies owed in excess of $750,000 that permits the other party to such agreement to declare a default or accelerate amounts due, or the existence of a circumstance or event that would, with or without the passage of time or the giving of notice, result in a default under an agreement that would or is reasonably expected to have a material adverse effect; and • breaches of certain covenants that are not timely cured, where a cure period is permitted. Redemption. Commencing on December 1, 2018, and on the sixteenth day and first day of each calendar month thereafter until March 1, 2020, subject to extension in certain circumstances (the “Series D Maturity Date”), the Company will redeem the stated value of Series D Preferred Stock, or $30,680,000, in thirty-one equal installments of approximately $989,677 (each installment amount, a “Series D Installment Amount” and the date of each such payment, a “Series D Installment Date”). The holders will have the ability to defer installment payments, but not beyond the Series D Maturity Date. In addition, during each period commencing on the 11th Trading Day prior to a Series D Installment Date and prior to the immediately subsequent Series D Installment Date, the holders may elect to accelerate the conversion of Series D Preferred Shares at then applicable installment conversion price, provided that the holders may not elect to effect any such acceleration during such installment period if either (a) in the aggregate, all the accelerations in such installment period exceed the sum of three other Series D Installment Amounts, or (b) the number of Series D Preferred Shares subject to prior accelerations exceeds in the aggregate twelve Series D Installment Amounts. Subject to certain beneficial ownership limitations, the Company may elect to pay the Series D Installment Amounts in cash or shares of common stock or in a combination of cash and shares of common stock, except that the Company’s right to make payment in shares of common stock, or an installment conversion, is dependent upon satisfying certain equity conditions set forth in the Series D Certificate of Designation. The failure to satisfy such equity conditions is referred to herein as an equity conditions failure. Among other things, these equity conditions include the Company’s continued listing on The Nasdaq Global Market or another permitted exchange, the Company reserving 150% of the number of shares of common stock necessary to effect the conversion of the Series D Preferred Shares that then remain outstanding (without regard to any limitations on conversions, such as beneficial ownership limitations) during the applicable measurement period, and the Company’s common stock maintaining certain minimum average prices and trading volumes during the applicable measurement period. Upon an equity conditions failure, a holder of Series D Preferred Shares may waive such failure (subject to certain exceptions) and receive the Series D Installment Amount in shares of our common stock based on the installment conversion price (calculated as described in the following paragraph). Alternatively, a holder of Series D Preferred Shares may elect to receive all or part of the Series D Installment Amount due in cash, which shall include an 8% premium to the Series D Installment Amount. Series D Installment Amounts paid in shares will be that number of shares of common stock equal to (a) the applicable Series D Installment Amount, to be paid in common stock divided by (b) the lesser of  (i) the then existing conversion price, (ii) 87.5% of the volume weighted average price (“VWAP”) of the common stock on the Trading Day immediately prior to the applicable Series D Installment Date, and (iii) 87.5% of the arithmetic average of the two lowest VWAPs of the common stock during the ten consecutive Trading Day period ending and including the Trading Day immediately prior to the applicable Series D Installment Date as applicable, provided that the Company meets standard equity conditions. The Company shall make such election no later than the eleventh Trading Day immediately prior to the applicable Series D Installment Date. If the Company elects or is required to pay a Series D Installment Amount in whole or in part in cash, the amount paid will be equal to 108% of the applicable Series D Installment Amount. Redemption Upon a Triggering Event. In the event of a triggering event (as defined in the Series D Certificate of Designation and summarized above), the holders of Series D Preferred Shares may require the Company to redeem such Series D Preferred Shares in cash at a price equal to the greater of  (a) 125% of the stated value of the Series D Preferred Shares being redeemed plus accrued dividends, if any, and (b) the market value of the number of shares issuable on conversion of the Series D Preferred Shares, valued at the greatest closing sales price during the period from the date immediately before the triggering event through the date the Company makes the redemption payment. Redemption Upon a Change of Control. In the event of a change of control, as defined in the Series D Certificate of Designation, the holders of Series D Preferred Shares can force redemption at a price equal to the greater of  (a) the conversion amount to be redeemed multiplied by 125%, (b) the product of  (i) the conversion amount being redeemed multiplied by (ii) the quotient determined by dividing (A) the greatest closing sale price of the common stock on any Trading Day during the period commencing immediately preceding the earlier to occur of (1) the consummation of the applicable change of control and (2) the public announcement of such change of control and ending on the date such holder delivers the change of control redemption notice, by (B) the conversion price then in effect and (c) the product of  (i) the conversion amount being redeemed multiplied by (ii) the quotient determined by dividing (A) the aggregate value of the cash and non-cash consideration per share of common stock being paid to holders of common stock in the change of control transaction by (B) the conversion price then in effect. Redemptions of the Series D Preferred Shares required under the Series D Certificate of Designation in connection with a change of control will have priority over payments to all other stockholders of the Company in connection with such change of control. Dividends. Each holder of Series D Preferred Shares shall be entitled to receive dividends (a) if no triggering event, as defined in the Series D Certificate of Designation, has occurred and is continuing when and as declared by the Company’s board of directors, in its sole and absolute discretion or (b) if a triggering event has occurred and until such triggering event has been cured, a dividend of 15% per annum based on the holder’s outstanding number of Series D Preferred Shares multiplied by the stated value. The holders of Series D Preferred Shares also have the right to participate in any dividend or other distribution made to holders of common stock to the same extent as if they had converted their Series D Preferred Shares. Liquidation Preference. In the event of the liquidation, dissolution, or winding up of the Company, prior to distribution to holders of securities ranking junior to the Series D Preferred Stock, holders of Series D Preferred Shares will be entitled to receive the amount of cash, securities or other property equal to the greater of (a) the stated value thereof on the date of such payment plus accrued dividends, if any and (b) the amount per share such holder would receive if such holder converted such Series D Preferred Shares into common stock immediately prior to the date of such payment. Ranking. Shares of Series D Preferred Stock rank with respect to dividend rights and rights upon the liquidation, winding up or dissolution of the Company: • senior to shares of the Company’s common stock; • junior to the Company’s debt obligations; • junior to the Company’s outstanding Series B Preferred Stock; • pari passu to the Company’s outstanding Series C Preferred Stock; and • effectively junior to the Company’s subsidiaries’ (i) existing and future liabilities and (ii) capital stock held by others. Limited Voting Rights . The holders of Series D Preferred Shares have no voting rights, except as required by law; provided, however, that any amendment to the Company’s certificate of incorporation or bylaws or the Series D Certificate of Designation that adversely affects the powers, preferences and rights of the Series D Preferred Stock requires the approval of the holders of a majority of the Series D Preferred Shares then outstanding. Participation Rights. Until August 29, 2019, the holders of the Series D Preferred Shares have the right to receive notice of and to participate in any offering, issuance or sale of equity or equity-equivalent securities by the Company or its subsidiaries, other than issuances under certain employee benefit plans, upon the conversion of certain options or other convertible securities, or pursuant to certain acquisitions or strategic transactions. Pursuant to such participation rights, the Company must offer to issue and sell to such holders at least 35% of the offered securities. Consent and Waiver. On February 21, 2019, the Company entered into a Consent and Waiver with each of the holders of the Series D Preferred Shares, pursuant to which the holders of the Series D Preferred Shares consented to the adjustments to the conversion price of the Series C Preferred Stock set forth in the Waiver Agreement (as defined below) and waived certain anti-dilution rights and conversion price adjustments under the Series D Certificate of Designation that may have resulted from the conversion price adjustments set forth in the Waiver Agreement. The holders of the Series D Preferred Shares further acknowledged that no anti-dilution or other adjustments under the Series D Certificate of Designation would result from the exchange of the Series A Warrant for shares of, or the issuance of shares of, the Company’s common stock pursuant to the Exchange Agreement. Series C Preferred Stock The Company issued an aggregate of 33,500 shares of its Series C Convertible Preferred Stock (“Series C Preferred Stock” and such shares, the “Series C Preferred Shares”), $0.01 par value and $1,000 stated value per share, during the fiscal year ended October 31, 2017. As of April 30, 2019 and October 31, 2018, there were 1,618 and 8,992 shares, respectively, of Series C Preferred Stock issued and outstanding with a carrying value of $3.2 million and $7.5 million, respectively. See Note 18, “Subsequent Events” for information regarding the conversion of all of the remaining shares of Series C Preferred Stock after the end of the quarter. On February 21, 2019, the Company entered into a waiver agreement (the “Waiver Agreement”) with the holder of the Series C Preferred Stock (such holder, the “Series C Holder”). Under the Waiver Agreement, the Series C Holder waived any equity conditions failures that may have occurred under the Certificate of Designations, Preferences and Rights of the Series C Preferred Stock (the “Series C Certificate of Designations”). The Series C Holder further waived any triggering event occurring after the date of the Waiver Agreement, as well as its right to demand, require or otherwise receive cash payments under the Series C Certificate of Designations, which waiver would have terminated upon the occurrence of certain key triggering events (failure to provide freely tradable shares, suspension from trading on Nasdaq or another eligible market, or failure to convert or deliver shares under certain circumstances), the occurrence of a fundamental transaction, a breach of the Waiver Agreement, or the occurrence of a bankruptcy triggering event. In addition, the Company agreed in the Waiver Agreement, pursuant to Section 8(d) of the Series C Certificate of Designations, to adjust the conversion price of the Series C Preferred Stock in connection with future conversions, such that, when the Series C Holder converted its Series C Preferred Stock into common stock, it would receive approximately 25% more shares than it would have received upon conversion prior to the execution of the Waiver Agreement. Under the Waiver Agreement, the conversion price of the Series C Preferred Stock is stated to be the lowest of (i) $4.45, (ii) 85% of the lowest closing bid price of the Company’s common stock during the period beginning on and including the fifth trading day prior to the date on which the applicable conversion notice is delivered to the Company and ending on and including the date on which the applicable conversion notice is delivered to the Company, and (iii) 85% of the quotient of (A) the sum of the five lowest VWAPs of the Company’s common stock during the twenty consecutive trading day period ending and including the trading day immediately preceding the applicable conversion date divided by (B) five (5). st th Under the Waiver Agreement, the Company was also deemed to have reduced the conversion price of the Series C Preferred Shares converted between the time of the equity conditions failures and the date of the Waiver Agreement as necessary to cause the number of shares of common stock delivered upon such conversions to equal the number of shares issuable upon conversion at such times. During the three and six months ended April 30, 2019, holders of the Series C Preferred Stock converted 5,852 and 7,374 Series C Preferred Shares, respectively, into shares of common stock through conversions resulting in a reduction of $10.4 million and $12.3 million, respectively, to the carrying value being recorded to equity. In order to resolve different interpretations of the provisions of the Series C Certificate of Designations that governed adjustments to the conversion price in connection with sales of common stock under the Company’s at-the-market stock sales plan below the initial conversion price $22.08 and whether such sales constituted sales of variable priced securities under the Series C Certificate of Designations, the Company’s board of directors agreed to reduce the conversion price of the Series C Preferred Shares from $22.08 to $18.00 effective August 27, 2018 in exchange for a waiver of certain anti-dilution and price adjustment rights under the Series C Certificate of Designations for future at-the-market sales of common stock. The conversion price of the Series C Preferred Shares was adjusted again on December 3, 2018 to $6.96, on December 17, 2018 to $6.00 and on January 2, 2019 to $5.16. During the three months ended April 30, 2019, the conversion price was further adjusted on eleven occasions to prices ranging from $4.45 to $2.51, the conversion price as of April 30, 2019. occurring during the three and six months ended April 30, 2019 in which the installment conversion price was below the adjusted conversion prices The deemed contributions represent the difference between the fair value of the common shares issued to settle the installment amounts and the carrying value of the Series C Preferred Shares Based on review of pertinent accounting literature including Accounting Standards Codification (“ASC”) 470 – Debt - Distinguishing Liabilities from Equity Derivative and Hedging The Waiver Agreement was treated for accounting purposes to be an extinguishment of the Series C Preferred Stock instrument as of February 21, 2019. The Series C Preferred Stock remains classified in mezzanine equity, however, the carrying value was adjusted to reflect the estimated fair value of the post-modification Series C Preferred Shares which incorporated the new terms outlined in the Waiver Agreement. A summary of certain terms, including terms in effect prior to the date of the Waiver Agreement, of the Series C Preferred Stock is as follows. Conversion Rights. As of April 30, 2019, the Series C Preferred Shares were convertible into shares of common stock, subject to the beneficial ownership limitations provided in the Series C Certificate of Designations, at a conversion price equal to $2.51 per share. The conversion price was subject to adjustment as provided in the Series C Certificate of Designations, including adjustments if the Company sold shares of common stock or equity securities convertible into or exercisable for shares of common stock, at variable prices below the conversion price then in effect. Under the Series C Certificate of Designations, i n the event of a triggering event, as defined in the Series C Certificate of Designations, the Series C Preferred Shares would have been convertible into shares of common stock at a conversion price equal to the lower of the conversion price then in effect and 85% of the lowest VWAP of the common stock of the five trading days immediately prior to delivery of the applicable conversion notice. The holders were prohibited from converting Series C Preferred Shares into shares of common stock if, as a result of such conversion, such holder, together with its affiliates, would own more than 8.99% of the total number of shares of common stock then issued and outstanding. Each holder had the right to increase its maximum percentage up to 9.99% upon 60 days’ notice to the Company. As described above, under the Waiver Agreement, the holder waived any triggering event occurring after the date of the Waiver Agreement, as well as its right to demand, require or otherwise receive cash payments under the Series C Certificate of Designations, which waiver would have terminated upon the occurrence of certain key triggering events, the occurrence of a fundamental transaction, a breach of the Waiver Agreement, or the occurrence of a bankruptcy triggering event. Installment Payments Prior to Execution of Waiver Agreement. On November 1, 2017 and on the sixteenth day and first day of each calendar month thereafter until March 1, 2019, subject to extension in certain circumstances (the “Series C Maturity Date”), inclusive, the Company was required to redeem the stated value of Series C Preferred Shares in thirty-three equal installments of approximately $1.0 million (each bimonthly amount, a “Series C Installment Amount” and the date of each such payment, a “Series C Installment Date”). The holders had the ability to defer installment payments, but not beyond the Series C Maturity Date. In addition, during each period commencing on the 11th trading day prior to a Series C Installment Date and prior to the immediately subsequent Series C Installment Date, the holders could elect to accelerate the conversion of Series C Preferred Shares at the then applicable installment conversion price, provided that the holders could not elect to effect any such acceleration during such installment period if either (a) in the aggregate, all the accelerations in such installment period would exceed the sum of three other Series C Installment Amounts, or (b) the number of Series C Preferred Shares subject to prior accelerations would exceed in the aggregate twelve Series C Installment Amounts. Subject to certain conditions as provided in the Series C Certificate of Designations, the Company could elect to pay the Series C Installment Amounts in cash or shares of common stock or in a combination of cash and shares of common stock. Series C Installment Amounts paid in shares were to be that number of shares of common stock equal to (a) the applicable Series C Installment Amount, to be paid in common stock divided by (b) the least of (i) the then existing conversion price, (ii) 87.5% of the VWAP of the common stock on the trading day immediately prior to the applicable Series C Installment Date, and (iii) 87.5% of the arithmetic average of the two lowest VWAPs of the common stock during the ten consecutive trading day period ending and including the trading day immediately prior to the applicable Series C Installment Date as applicable, provided that the Company met standard equity conditions. The Company was to make such election no later than the eleventh trading day immediately prior to the applicable Series C Installment Date. If the Company elected or was required to pay a Series C Installment Amount in whole or in part in cash, the amount paid would be equal to 108% of the applicable Series C Installment Amount. Under the Waiver Agreement, the Company was no longer obligated to make installment payments under Section 9 of the Series C Certificate of Designations, and the holder was permitted to convert at any time, in its discretion, subject to certain beneficial ownership limitations. Dividends. Each holder of the Series C Preferred Shares was entitled to receive dividends (a) if no triggering event, as defined in the Series C Certificate of Designations, had occurred and was continuing when and as declared by the Company’s board of directors, in its sole and absolute discretion or (b) if a triggering event had occurred and until such triggering event had been cured, a dividend of 15% per annum based on the holder’s outstanding number of Series C Preferred Shares multiplied by the stated value. There were no triggering events or dividends declared in fiscal year 2017, fiscal year 2018 or during the six months ended April 30, 2019. As described above, under the Waiver Agreement, the holder waived, subject to certain conditions and limitations, all triggering events occurring after the date of the Waiver Agreement. Redemption. In the event of a triggering event, as defined in the Series C Certificate of Designations, the holders of the Series C Preferred Shares could force redemption at a price equal to the greater of (a) the conversion amount to be redeemed multiplied by 125% and (b) the product of (i) the conversion rate with respect to the conversion amount in effect at such time as such holder delivers a triggering event redemption notice multiplied by (ii) the greatest closing sale price of the common stock on any

Loss Per Share

Loss Per Share	6 Months Ended
	Apr. 30, 2019
Earnings Per Share [Abstract]
Loss Per Share	Note 13. 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, 2019 2018 2019 2018 Numerator Net loss $ (19,530 ) $ (13,174 ) $ (37,078 ) $ (17,357 ) Series A warrant exchange (3,169 ) — (3,169 ) — Series B preferred stock dividends (800 ) (800 ) (1,600 ) (1,600 ) Series C preferred stock deemed contributions (dividends) and redemption value adjustment, net 1,599 (4,199 ) (7,406 ) (7,662 ) Series D Preferred stock deemed dividends and redemption accretion (976 ) — (6,661 ) — Net loss attributable to common stockholders $ (22,876 ) $ (18,173 ) $ (55,914 ) $ (26,619 ) Denominator Weighted average basic common shares 11,090,698 6,630,272 9,683,253 6,310,964 Effect of dilutive securities (1) — — — — Weighted average diluted common shares 11,090,698 6,630,272 9,683,253 6,310,964 Basic loss per share $ (2.06 ) $ (2.74 ) $ (5.77 ) $ (4.22 ) Diluted loss per share (1) $ (2.06 ) $ (2.74 ) $ (5.77 ) $ (4.22 ) (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 antidilutive. As of April 30, 2019 and 2018, potentially dilutive securities excluded from the diluted loss per share calculation are as follows: April 30, April 30, 2019 2018 May 2017 Offering - Series C Warrants 964,114 964,114 July 2016 Offering - Series A Warrants — 640,000 Outstanding options to purchase common stock 24,945 27,324 Unvested Restricted Stock Awards 32,659 98,788 Unvested Restricted Stock Units 212,034 258,737 Series C Preferred Shares to satisfy conversion requirements (1) 313,589 658,899 Series D Preferred Shares to satisfy conversion requirements (2) 1,114,890 — 5% Series B Cumulative Convertible Preferred Stock 37,837 37,837 Series 1 Preferred Shares to satisfy conversion requirements 1,264 1,264 Total potentially dilutive securities 2,701,332 2,686,963 (1) The number of shares of common stock issuable upon conversion of the Series C Preferred Stock was calculated using the liquidation preference value outstanding on April 30, 2019 of $1.6 million divided by the reduced conversion price of $5.16 and the liquidation preference of $14.5 million divided by the conversion price of $22.08 as of April 30, 2018. The actual number of shares issued could vary depending on the actual market price of the Company’s common shares on the date of such conversions. (2) The number of shares of common stock issuable upon conversion of the Series D Preferred Stock was calculated using the liquidation preference value outstanding on April 30, 2019 of $18.5 million divided by the conversion price of $16.56. The actual number of shares issued could vary depending on the actual market price of the Company’s common shares on the date of such conversions.

Restricted Cash

Restricted Cash	6 Months Ended
	Apr. 30, 2019
Restricted Cash And Investments [Abstract]
Restricted Cash	Note 14. Restricted Cash As of April 30, 2019 and October 31, 2018, there was $38.1 million and $40.9 million, respectively, of restricted cash and cash equivalents pledged as collateral for letters of credit for certain banking requirements and contractual commitments. The restricted cash balance for both periods presented includes $15.0 million which was placed in a Grantor’s Trust account to secure certain obligations under a 15-year service agreement and has been classified as long-term (refer to Note 18, “Subsequent Events” for further information). The restricted cash balance as of April 30, 2019 and October 31, 2018 also includes $17.6 million and $17.7 million, respectively, to support obligations related to PNC sale-leaseback transactions. As of April 30, 2019 and October 31, 2018, outstanding letters of credit totaled $3.5 million and $3.8 million, respectively. These expire on various dates through August 2028.

Debt and Financing Obligation

Debt and Financing Obligation	6 Months Ended
	Apr. 30, 2019
Debt [Abstract]
Debt and Financing Obligation	Note 15. Debt and Financing Obligation Debt as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Connecticut Development Authority Note $ — $ 284 Connecticut Green Bank Note 6,051 6,052 Finance obligation for sale-leaseback transactions 45,284 46,062 State of Connecticut Loan 10,000 10,000 Hercules Loan and Security Agreement 23,812 25,343 New Britain Renewable Energy Term Loan 792 1,107 NRG Loan Facility 5,750 — Generate Lending Construction Loan 10,000 — Enhanced Capital Loan and Security Agreement 1,500 — Fifth Third Bank Loan Agreement 11,072 — Capitalized lease obligations 249 341 Deferred finance costs (1,517 ) (1,311 ) Total debt and financing obligations $ 112,993 $ 87,878 Current portion of long-term debt and financing obligations (54,815 ) (17,596 ) Long-term debt and financing obligations $ 58,178 $ 70,282 As of April 30, 2019, the Company had a long-term loan agreement with the Connecticut Green Bank, providing a total of $5.9 million in support of the Bridgeport Fuel Cell Project (as defined below). The loan agreement carries an interest rate of 5.0 percent per annum. Interest only payments commenced in January 2014 and principal payments were to commence on the eighth anniversary of the project’s provisional acceptance date of December 20, 2021. Subsequent to April 30, 2019, this loan was partially repaid with a new project level loan from Connecticut Green Bank in connection with the Company’s acquisition of all of the membership interests in Dominion Bridgeport Fuel Cell, LLC (which is now known as Bridgeport Fuel Cell, LLC). Refer to Note 18, “Subsequent Events” for information regarding the new loan from Connecticut Green Bank. In 2015, the Company entered into the first of a series of agreements with PNC, whereby the Company’s project finance subsidiaries entered into sale-leaseback agreements for commissioned projects where the Company had entered into a PPA with the site host/end-user of produced power. Under the financing method of accounting for a sale-leaseback, the Company does not recognize as income any of the sale proceeds received from the lessor that contractually constitute payments to acquire the assets subject to these arrangements. Instead, the sale proceeds received are accounted for as financing obligations. The outstanding financing obligation balance as of April 30, 2019 was $45.3 million and the decrease from $46.1 million on October 31, 2018 includes lease payments offset by the recognition of interest expense. The outstanding financing obligation includes an embedded gain which will be recognized at the end of the lease term. In November 2015, the Company entered into a definitive Assistance Agreement with the State of Connecticut and received a disbursement of $10.0 million, which was used for the first phase of the expansion of the Company’s Torrington, Connecticut manufacturing facility. In conjunction with this financing, the Company entered into a $10.0 million promissory note and related security agreements securing the loan with equipment liens and a mortgage on its Danbury, Connecticut location. Interest accrues at fixed interest rate of 2.0 percent, repayable over 15 years. Principal payments were deferred for four years from disbursement and begin on December 1, 2019. Under the Assistance Agreement, the Company was eligible for forgiveness of up to 50 percent of the loan principal if the Company created 165 full-time positions and retained 538 full-time positions for two consecutive years (the “Employment Obligation”) as measured on October 28, 2017 (the “Target Date”). The Assistance Agreement was subsequently amended in April 2017 to extend the Target Date by two years to October 28, 2019. In January 2019, the Company and the State of Connecticut entered into a Second Amendment to the Assistance Agreement (the “Second Amendment”). The Second Amendment extends the Target Date to October 31, 2022 and amends the Employment Obligation to require the Company to maintain 538 full-time positions for 24 consecutive months. If the Company meets the Employment Obligation, as modified by the Second Amendment, and creates an additional 91 full-time positions, the Company may receive a credit in the amount of $2.0 million to be applied against the outstanding balance of the loan. The Second Amendment deletes and cancels the provisions of the Assistance Agreement related to the second phase of the expansion project and the loans related thereto, but the Company had not drawn any funds or received any disbursements under those provisions. A job audit will be performed within ninety days of the Target Date. If the Company does not meet the Employment Obligation, then a penalty shall be assessed at a rate of $18,587.36 times the number of employees below the Employment Obligation. Such penalty is immediately payable and will be first applied against any outstanding fees or interest due and then against outstanding principal. In April 2016, the Company entered into a loan and security agreement (as amended from time to time, the “Hercules Agreement”) with Hercules for an aggregate principal amount of up to $25.0 million, subject to certain terms and conditions. The loan was a 30 month secured facility. The term loan interest rate was 9.75 percent per annum as of October 31, 2017 and increased to 10.0 percent per annum as of January 31, 2018 as a result of the increase in the prime rate. In addition to interest, which is paid on a monthly basis, principal payments commenced on November 1, 2017 in equal monthly installments. The loan balance and all accrued and unpaid interest was due and payable by October 1, 2018. Under the terms of the Hercules Agreement, there was an end of term charge of $1.7 million due on October 31, 2018, which was being accreted over the 30-month term using the effective interest rate method. As discussed in the paragraphs below and in Note 18, “Subsequent Events”, the Company has entered into a series of amendments to the Hercules Agreement in order to, among other things, provide for a lower minimum cash covenant, adjust certain other covenants and avoid events of default being declared and acceleration of the loan. Refer to Note 18 “Subsequent Events” for information regarding additional amendments to the terms of the Hercules Agreement subsequent to April 30, 2019. The Hercules Agreement was subsequently amended on September 5, 2017, October 27, 2017, March 28, 2018, August 29, 2018, December 19, 2018, February 28, 2019 and March 29, 2019. The March 28, 2018 amendment allowed the Company to draw a term loan advance of $13.1 million and extended the maturity date to April 1, 2020. Payments for the aggregate amount outstanding are interest-only for the initial 12-month period, followed by equal monthly installments of principal and interest until the term loan maturity date. Principal payments under the Hercules Agreement began on April 1, 2019 and total approximately $1.8 million per month. The term loan interest rate was 10.15% per annum and increased to 10.40% per annum in June 2018, 10.65% per annum in September 2018 and 10.90% per annum in December 2018 as a result of increases in the prime rate. The term loan interest rate is the greater of either (i) 9.90% plus the prime rate minus 4.50%, and (ii) 9.90%. The initial end of term charge of $1.7 million was paid on October 1, 2018. An additional end of term charge of $0.9 million will be due on April 1, 2020. The additional end of term charge is being accreted over a 30-month term. On August 29, 2018, in connection with the issuance of the Series D Preferred Stock, the Company and Hercules (and various affiliated entities) entered into the fourth amendment to the Hercules Agreement to (i) modify the definition of “Permitted Indebtedness” to include certain redemption and/or conversion rights as set forth in the Series D Certificate of Designation, (ii) permit the Company, so long as no event of default has occurred and is continuing, to repurchase or redeem stock in cash pursuant to the redemption and/or conversion rights set forth in the Series D Certificate of Designation; provided that, the Company must make any such repurchase, redemption or payment in common stock and not in cash or other consideration unless prohibited pursuant to the terms of the Series D Certificate of Designation or otherwise prohibited by applicable law, (iii) permit the Company, so long as no event of default has occurred and is continuing, to pay cash dividends under the Series D Preferred Shares as required in the Series D Certificate of Designation; provided that, the Company must pay such dividends in common stock and not in cash or other consideration unless prohibited pursuant to the terms of the Series D Certificate of Designation or otherwise prohibited by applicable law, and (iv) add a new On February 28, 2019, the Company and Hercules (and various affiliated entities) entered into the sixth amendment to the Hercules Agreement (such amendment, the “February Amendment”), which was effective as of February 22, 2019. Under the February Amendment, the Company was required, at all times following February 22, 2019 through March 31, 2019, to maintain an unrestricted cash balance of at least (a) 50% of the outstanding loan balance, plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the invoice date, in accounts subject to an account control agreement in favor of Hercules. Further, under the February Amendment, at all times after March 31, 2019, the Company was required to maintain an unrestricted cash balance of at least (a) 75% of the outstanding loan balance, plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the invoice date, in accounts subject to an account control agreement in favor of Hercules . On March 29, 2019, the Company and Hercules (and various affiliated entities) entered into the seventh amendment to the Hercules Agreement (such amendment, the “March 2019 Amendment”). Under the March 2019 Amendment, the Company was required, at all times following February 22, 2019 through April 30, 2019, to maintain an unrestricted cash balance of at least (a) 50% of the outstanding loan balance, plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the invoice date, in accounts subject to an account control agreement in favor of Hercules. Further, under the March 2019 Amendment, at all times after April 30, 2019, the Company was required to maintain an unrestricted cash balance of at least (y) 75% of the outstanding loan balance, plus (z) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the invoice date, in accounts subject to an account control agreement in favor of Hercules. The Hercules Agreement, as amended, contains certain representations and warranties, affirmative and negative covenants, and events of default, including the occurrence of a circumstance that would reasonably be expected to have a material adverse effect, that entitle Hercules to cause the indebtedness under the agreement to become immediately due and payable. The occurrence of an event of default under the Hercules Agreement also constitute or may result in an event of default under, and cause or may cause the acceleration of a number of material financial obligations including the State of Connecticut loan, the Connecticut Green Bank Loan and the Generate Lending, PNC and Fifth Third project finance facilities. The occurrence of an event of default under the Hercules Agreement also constitute a triggering event under the Series D Certificate of Designations. As collateral for obligations under the Hercules Agreement, the Company granted Hercules a security interest in FuelCell Energy, Inc.’s existing and thereafter-acquired assets except for intellectual property and certain other excluded assets. The collateral does not include assets held by FuelCell Energy Finance, LLC (“FuelCell Finance”) or any project subsidiary thereof. The Company may continue to collateralize and finance its project subsidiaries through other lenders and partners. In November 2016, the Company assumed debt with Webster Bank in the amount of $2.3 million as a part of an asset acquisition transaction. The term loan interest rate is 5.0 percent per annum and payments, which commenced in January 2017, are due on a quarterly basis. The balance outstanding as of April 30, 2019 and October 31, 2018 was $0.8 million and $1.1 million, respectively. In July 2014, the Company, through its wholly-owned subsidiary, FuelCell Finance, entered into a Loan Agreement with NRG (the “NRG Loan Agreement”). Pursuant to the NRG Loan Agreement, NRG extended a $40.0 million loan facility to FuelCell Finance for the purpose of accelerating project development by the Company and its subsidiaries. Under the NRG Loan Agreement, FuelCell Finance and its subsidiaries were permitted to draw on the loan facility to finance the construction of projects through the commercial operating date of the power plants. Additionally, FuelCell Finance had the option to continue the financing term for each project after the commercial operating date for a minimum term of five years per project. The interest rate is 8.5 percent per annum for construction-period financing and 8.0 percent per annum thereafter. On December 13, 2018, FuelCell Finance’s wholly owned subsidiary, Central CA Fuel Cell 2, LLC, drew a construction loan advance of $5.8 million under the loan facility. This advance was used to support the completion of construction of the 2.8 MW Tulare BioMAT project in California. This plant is expected to meet its commercial operations date in June 2019. On March 29, 2019, FuelCell Finance and NRG entered into a third amendment to the NRG Loan Agreement, which amends the definition of “Maturity Date” under the NRG Loan Agreement. Pursuant to the third amendment, the Maturity Date of each note is was revised to be the date that is the earlier of (a) June 17, 2019, (b) the commercial operation date or substantial completion date, as applicable, with respect to the fuel cell project owned by the borrower under such note, and (c) closing of a refinancing of indebtedness. In connection with the execution of the third amendment, the Company paid a $250,000 non-refundable fee to NRG agreed to make an additional payment of $750,000 at the maturity date. This maturity date was subsequently amended to July 12, 2019. On December 21, 2018, the Company, through its indirect wholly-owned subsidiary FuelCell Energy Finance II, LLC (“FCEF II”), entered into a Construction Loan Agreement (the “Generate Agreement”) with Generate Lending, LLC (“Generate Lending”) pursuant to which Generate Lending agreed (the “Commitment”) to make available to FCEF II a credit facility in an aggregate principal amount of up to $100.0 million and, subject to further Generate Lending approval and available capital, up to $300.0 million if requested by the Company (the “Generate Facility”) and approved by Generate Lending to fund the manufacture, construction, installation, commissioning and start-up of stationary fuel cell projects to be developed by the Company on behalf of FCEF II during the Availability Period (as defined below and in the Generate Agreement). Fuel cell projects must meet certain conditions to be determined to be “Approved Projects” under the Generate Facility. The Generate Facility will be comprised of multiple loans to individual Approved Projects (each, a “Working Capital Loan”). Each Working Capital Loan will be sized to the lesser of (i) 100% of the construction budget and (ii) the invested amount that allows Generate Lending to achieve a 10% unlevered, after-tax inefficient internal rate of return. Approved Projects will be funded at milestones on a cost incurred basis. FCEF II and the Company will contribute any additional equity required to construct an Approved Project on a pari-passu basis with the Working Capital Loans. The Commitment to provide Working Capital Loans will remain in place for thirty-six months from the date of the Generate Agreement (the “Availability Period”). Interest will accrue at 9.5% per annum, calculated on a 30/360 basis, on all outstanding principal, paid on the first business day of each month. The initial draw amount under this facility, funded at closing, was $10.0 million. The maturity date for the outstanding principal amount of each Working Capital Loan will be the earlier of (a) the achievement of the Commercial Operation Date under the Engineering, Procurement and Construction (“EPC”) Agreement for such Approved Project, (b) ninety days prior to the required Commercial Operation Date under the Revenue Contract (as defined in the Generate Agreement), or (c) upon certain defaults by FCEF II. Generate Lending has the right to issue a notice to FCEF II that the Commitment, and that all Working Capital Loans shall be due and payable on September 30, 2019; provided that such notice shall be issued by Generate Lending, if at all, during the ten (10) day period beginning on June 20, 2019 and ending on (and including) June 30, 2019. If Generate Lending delivers such notice, all of the Working Capital Loans, together with all accrued and unpaid interest thereon, shall be due and payable in its entirety, without penalty or premium. If Generate Lending delivers such notice, FCEF II may prepay all then outstanding Working Capital Loans at any time prior to September 30, 2019. Mandatory prepayments are required in the event of (i) material damage or destruction to an Approved Project, (ii) termination or default under an Approved Project’s Revenue Contract, (iii) a change of control, or (iv) failure to achieve Substantial Completion as defined under the EPC Agreement for such Approved Project by the required dates. Provided that the Approved Project has been completed as of the maturity date and no defaults exist with respect to the Working Capital Loans for such Approved Project, FCEF II, as determined in its sole discretion, will have a 90-day period to either sell the Approved Project or effect a refinancing, in either case proceeds of which will be used to repay the Working Capital Loan for the Approved Project. In the case of a disposition of the Approved Project, Generate Lending will be entitled to a “Disposition Fee,” as described below. In the case where the Working Capital Loan for the Project is refinanced, Generate Lending will have the right to make an equity investment in the Approved Project on terms such that Generate Lending derives an after-tax yield of no less than a 12% internal rate of return on an investment of greater than 10% of the total purchase price. FCEF II and Generate Lending will enter into an arrangement to share any returns realized in excess of the foregoing target return. In the event that FCEF II does not sell or refinance an Approved Project within ninety days following the Working Capital Loan maturity date (or such other date as may be mutually agreed), then the outstanding balance of the Working Capital Loan on such Approved Project shall convert into a 100% equity ownership of the applicable project company owning such Approved Project through execution of a Membership Interest Purchase Agreement (“MIPA”) with Generate Lending. At that time, Generate Lending will own the project and FCEF II will not have any repayment obligations. Included in the applicable MIPA for each Approved Project subject to this provision will be a conditional purchase price adjustment for FCEF II equal to 50% of any distributions to Generate Lending after Generate Lending has achieved a 10% inefficient after-tax, unlevered internal rate of return. In the event that FCEF II and Generate Lending are unable to come to terms on a MIPA for any Approved Project, the Working Capital Loan for such Approved Project will be required to be repaid in full without penalty or premium. FCEF II will pay a draw down fee equal to 3% of the amount of each Working Capital Loan and certain other diligence and administration fees. Upon the sale of any Approved Project to a third party, Generate Lending will be entitled to a disposition fee equal to 3% of the total sale price (“Disposition Fee”). At such time as Generate Lending has made Working Capital Loans in the aggregate amount of greater than $100,000,000 but less than $200,000,000, the Disposition Fee is reduced to 2% and in the aggregate amount of greater than $200,000,000 but less than $300,000,000, the Disposition Fee is reduced to 1%. The initial draw amount under the Generate Facility, funded at closing, was $10.0 million. The initial draw reflects loan advances for the first Approved Project under the Generate Facility, the Bolthouse Farms 5 MW project in California. Additional drawdowns are expected to take place as the Company completes certain project milestones. Given the Company’s current liquidity position, it is possible that projects may be delayed impacting amounts and timing of future funding. Delays in project execution may also lead to events of default under the Generate Facility. On January 9, 2019, the Company, through its indirect wholly-owned subsidiary TRS Fuel Cell, LLC, entered into a Loan and Security Agreement (the “Enhanced Capital Loan Agreement”) with Enhanced Capital Connecticut Fund V, LLC in the amount of $1.5 million. Interest will accrue at a rate of 6.0% per annum, calculated on a 30/360 basis, on all outstanding principal, paid on the first business day of each month. The loan maturity date is three years from the date of the Enhanced Capital Loan Agreement upon which the outstanding principal and accrued interest will be payable. On February 28, 2019, the Company, through its indirect wholly-owned subsidiary, Groton Station Fuel Cell, LLC (“Groton Borrower”), entered into a Construction Loan Agreement (the “Groton Agreement”) with Fifth Third Bank (“Fifth Third”) pursuant to which Fifth Third agreed to make available to Groton Borrower a construction loan facility in an aggregate principal amount of up to $23.0 million (the “Groton Facility”) to fund the manufacture, construction, installation, commissioning and start-up of the 7.4 9.7 Amounts borrowed under the Groton Facility bear interest at a rate equal to the sum of the one-month LIBOR Rate plus 2.25 The Company has agreed to guarantee Groton Borrower’s obligations under the Groton Agreement. In addition, Groton Borrower’s obligations under the Groton Agreement are secured by a first mortgage lien on Groton Borrower’s leasehold interest in the Groton Project site, a security interest in the Groton Project assets, including material Groton Project related contracts such as the power purchase agreement and EPC agreement, and the Company’s equity interest in the Groton Borrower. The Groton Agreement contains customary representations and warranties, affirmative and negative covenants, and events of default that entitle Fifth Third to cause the indebtedness under the Groton Facility to become immediately due and payable. The Company leases computer equipment under master lease agreements. Lease payment terms are generally thirty-six months from the date of acceptance for leased equipment. Deferred finance costs relate primarily to sale-leaseback transactions entered into with PNC which are being amortized over the ten-year term and direct deferred finance costs relating to the Hercules Agreement, as amended, which is being amortized over the 30-month life of the loan.

Income Taxes

Income Taxes	6 Months Ended
	Apr. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 16. Income Taxes The Company recorded income tax expense of $0.1 million for the three and six months ended April 30, 2019 compared to an income tax benefit totaling $3.0 million for the six months ended April 30, 2018. There was no income tax expense recorded for the three months ended April 30, 2018. The income tax benefit for the six months ended April 30, 2018 primarily related to the Tax Cuts and Jobs Act (the “Act”) that was enacted on December 22, 2017. The Act reduced the U.S. federal corporate tax rate from 34% to 21% effective January 1, 2018 which resulted in a deferred tax benefit of $1.0 million primarily related to a reduction of the Company’s deferred tax liability for an in process research and development asset (“IPR&D”). The Act also established an unlimited carryforward period for the net operating loss (“NOL”) the Company generated in fiscal year 2018. This provision of the Act resulted in a reduction of the valuation allowance attributable to deferred tax assets at the enactment date by $2.0 million based on the indefinite life of the resulting NOL as well as the deferred tax liability for its IPR&D asset.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Apr. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 17. Commitments and Contingencies Lease Agreements As of April 30, 2019 and October 31, 2018, the Company had equipment financing and capital lease obligations of $0.2 million and $0.3 million, respectively. Payment terms are generally thirty-six months from the date of acceptance for leased equipment. The Company also leases certain computer and office equipment and manufacturing facilities in Torrington and Danbury, Connecticut under operating leases expiring on various dates through 2030. Non-cancelable minimum payments applicable to operating and capital leases as of April 30, 2019 were as follows: Operating Leases Capital Leases Due Year 1 $ 814 $ 171 Due Year 2 470 61 Due Year 3 443 15 Due Year 4 422 2 Due Year 5 374 — Thereafter 2,817 — Total $ 5,340 $ 249 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. Other As of April 30, 2019, the Company had unconditional purchase commitments aggregating $48.1 million, for materials, supplies and services in the normal course of business. The Company is involved in legal proceedings, claims and litigation arising out of the ordinary conduct of its business. Although the Company cannot assure the outcome, management presently believes that the result of such 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.

Subsequent Events

Subsequent Events	6 Months Ended
	Apr. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Note 18. Subsequent Events Acquisition of Bridgeport Fuel Cell Project and Execution of Related Credit Agreements On October 31, 2018, FuelCell Finance, entered into a membership interest purchase agreement (the “Purchase Agreement”) with Dominion Generation, Inc., amended on January 15, 2019 and May 9, 2019, pursuant to which FuelCell Finance purchased (on May 9, 2019) all of the outstanding membership interests in Dominion Bridgeport Fuel Cell, LLC (which is now known as Bridgeport Fuel Cell, LLC) (“BFC” On May 9, 2019, FuelCell Finance closed on the purchase of BFC for a total purchase price of approximately $35.5 million, subject to a dollar-for-dollar post-closing adjustment to the extent that the closing working capital is greater or less than $1.0 million (the “Purchase Price”). Also on May 9, 2019, in connection with the purchase of BFC, FuelCell Finance entered into a Credit Agreement with Liberty Bank, as administrative agent and co-lead arranger and Fifth Third as co-lead arranger and swap hedger (the “Credit Agreement”) whereby (i) Fifth Third provided financing to BFC in the amount of $12.5 million towards the Purchase Price; and (ii) Liberty Bank provided financing to BFC in the amount of $12.5 million towards the Purchase Price. As security for the Credit Agreement, Liberty Bank and Fifth Third were granted a first priority lien in (i) all assets of BFC, including BFC’s cash accounts, fuel cells, and all other personal property, as well as third party contracts including the Energy Purchase Agreement between BFC and Connecticut Light and Power Company dated July 10, 2009, as amended; (ii) certain newly manufactured fuel cell modules located at 3 Great Pasture Road, Danbury, CT that are intended to be used to replace the Bridgeport Fuel Cell Project’s fuel cell modules as part of routine operation and maintenance; and (iii) FuelCell Finance’s ownership interest in BFC. BFC has the right to make additional principal payments or pay the balance due under the Credit Agreement in full provided that it pays any associated breakage fees with regard to the interest rate swap agreements fixing the interest rate, discussed below. The maturity date is May 9, 2025. The interest rate under the Credit Agreement fluctuates monthly at the 30-day LIBOR rate plus 275 basis points on a total notional value of $25.0 million. An interest rate swap agreement was required to be entered into with Fifth Third in connection with the Credit Agreement to protect against movements in the floating LIBOR index. Accordingly, on May 16, 2019, BFC entered into the 1992 ISDA Master Agreement, along with the Schedule to such Agreement, with Fifth Third, and executed the related trade confirmations on May 17, 2019. Pursuant to the terms of such Agreement, Fifth Third and BFC will pay a fixed rate of interest of 2.34% multiplied by the notional amount of the swap in exchange for receipt of period payments based on a floating rate index of 2.75% multiplied by the same notional amount upon which the fixed rate payments are derived, with the notional amount in each case being equal to the outstanding principal amount under the loans from Fifth Third and Liberty Bank. The net interest rate across the Credit Agreement and the swap transaction totals a fixed rate of 5.09%. The obligations of BFC to Fifth Third under the swap agreement are treated as obligations under the Credit Agreement and, accordingly, are secured by the same collateral securing the obligations of BFC under the Credit Agreement. The Credit Agreement also requires BFC to maintain a debt service reserve at each of Liberty Bank and Fifth Third of $1.25 million, which debt service reserves were funded on May 10, 2019, to be held in deposit accounts at each respective bank, with funds to be disbursed with the consent of or at the request of the required lenders in their sole discretion. Each of Liberty Bank and Fifth Third also has an operation and module replacement reserve (“O&M Reserve”) of $250.0 thousand, both of which were funded at closing, to be held in deposit accounts at each respective bank, and thereafter BFC is required to deposit $100.0 thousand per month into each O&M Reserve for the first five years of the Credit Agreement, with such funds to be released at the sole discretion of Liberty Bank and Fifth Third, as applicable. BFC is also required to maintain excess cash flow reserve accounts at each of Liberty Bank and Fifth Third and to deposit 50% of the excess cash flows from the Bridgeport Fuel Cell Project into these accounts. Excess cash flow consists of cash generated by BFC from the Bridgeport Fuel Cell Project after payment of all expenses (including after payment of service fees to the Company), debt service to Liberty Bank and Fifth Third, the funding of all required reserves, and payments to Connecticut Green Bank for the subordinated facility (as described below). BFC is also required to maintain a debt service coverage ratio of not less than 1.20, measured annually. The Credit Agreement contains customary representations, warranties and covenants. In addition, on May 9, 2019, in connection with the closing of the purchase of BFC, BFC entered into a subordinated credit agreement with the Connecticut Green Bank whereby Connecticut Green Bank provided financing in the amount of $6.0 million (the “Subordinated Credit Agreement”), $1.8 million of which was used to collateralize a letter of credit issued by Liberty Bank to satisfy a performance assurance requirement in the Energy Purchase Agreement with Connecticut Light and Power Company and the balance of which was applied toward outstanding principal on the Company’s existing indebtedness to Connecticut Green Bank. As security for the Subordinated Credit Agreement, Connecticut Green Bank received a perfected lien, subordinated and second in priority to the liens securing the $25.0 million (senior term loan amount) loaned under the Credit Agreement, in all of the same collateral securing the Credit Agreement. The interest rate under the Subordinated Credit Agreement is 8% per annum. A commitment fee of $60.0 thousand was earned by Connecticut Green Bank in connection with the closing. The debt service coverage ratio required to be maintained under the Subordinated Credit Agreement may not be less than 1.10 as of the end of each fiscal quarter. The term of the Subordinated Credit Agreement expires 7 years from the date of the advance of the loan. Principal and interest are due monthly in amounts sufficient to fully amortize the loan over an 84 month period. However, monthly debt service payments can accumulate in arrearages in the event that BFC does not have sufficient cash to make any monthly debt service payment. BFC has the right to make additional principal payments or pay the balance in full at any time without additional fees or penalties. The Subordinated Credit Agreement also contains customary representations, warranties and covenants. The balance of the financing for the acquisition was from the $15 million of restricted cash on hand that was tied to the Bridgeport Fuel Cell Project and released at closing. Hercules Loan and Security Agreement Amendments On May 8, 2019, the Company and Hercules (and various affiliated entities) entered into the eighth amendment to the Hercules Agreement pursuant to which the Company was required, at all times commencing on May 1, 2019 through 2:00 pm Eastern Time on June 7, 2019, to maintain an unrestricted cash balance of at least 40% of the outstanding loan balance, in accounts subject to an account control agreement in favor of Hercules. After 2:00 pm Eastern Time on June 7, 2019, the Company was required to maintain, at all times, an unrestricted cash balance of at least (a) 75% of the outstanding loan balance plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the invoice date, in accounts subject to an account control agreement in favor of Hercules. In connection with the execution of this amendment, the Company paid a $250,000 non-refundable fee to Hercules. On June 11, 2019 (the “Ninth Amendment Effective Date”), the Company and each of its qualified subsidiaries, as borrower, certain banks and other financial institutions, as lender, and Hercules, as administrative agent for itself and lender, entered into the ninth amendment to the Hercules Agreement (the “Ninth Hercules Amendment”). Under the Ninth Hercules Amendment, borrower has agreed, among other things, to: (a) no later than June 11, 2019, pay lender $1.4 million to be applied towards the outstanding balance of the loan; (b) no later than June 26, 2019, direct EMRE (as defined below) to pay lender $6.0 million of the $10.0 million payable under the EMRE License Agreement (as defined below) to be applied towards the outstanding balance of the loan; and (c) on each of July 1, 2019 and August 1, 2019, pay lender interest-only payments on the outstanding principal balance of the loan. Borrower has further agreed that interest at the default rate of five percent per annum (in addition to the current interest rate) will accrue from June 3, 2019; provided, however, that, in the event that all of the secured obligations are paid in full on or prior to the last day of the Amendment Period (as defined below), lender will fully and unconditionally waive its right to payment of accrued and unpaid default interest. In such circumstances, lender will also fully and unconditionally waive payment of the prepayment charge which would have been two percent of the outstanding loan balance. In the Ninth Hercules Amendment, the term “Amendment Period” is defined as the period from and after the Ninth Amendment Effective Date through the earlier of (i) August 9, 2019 and (ii) the occurrence of any event of default under the Ninth Hercules Amendment. In addition, Hercules has waived borrower’s compliance with certain financial reporting covenants and the minimum unrestricted cash balance covenant set forth in the Hercules Agreement, in each case from June 11, 2019 through the end of the Amendment Period. Hercules further agreed that borrower is permitted to use and maintain one or more deposit accounts that are not subject to any account control agreements for the purpose of borrower’s receipt and use of $4.0 million of the $10.0 million to be received from EMRE under the EMRE License Agreement. Any failure by borrower to timely perform any of the obligations under the Ninth Hercules Amendment will constitute an event of default under the Hercules Agreement. Upon any failure by borrower to timely perform any of the obligations under the Ninth Hercules Amendment, Hercules will be permitted to issue a notice of default with respect to such an event of default and any other defaults that may exist, whether arising prior to the Ninth Amendment Effective Date or otherwise. As of June 11, 2019, prior to the application of the payments made and to be made to Hercules as described above, the outstanding principal balance under the Hercules Agreement was approximately $20.9 million. Management is exploring refinancing alternatives for the Company’s senior secured credit facility with Hercules. If the Company is not able to consummate such a refinancing transaction by August 9, 2019, and if Hercules is not willing to provide further accommodations, the Company could default on its obligations under its senior secured credit facility with Hercules, which would trigger additional defaults under other agreements. Advanced Technology License Agreement Effective as of June 11, 2019, the Company entered into the EMRE License Agreement with EMRE, pursuant to which the Company has agreed, subject to the terms of the EMRE License Agreement, to grant EMRE and its affiliates a non-exclusive, worldwide, fully paid, perpetual, irrevocable, non-transferrable license and right to use the Company’s patents, data, know-how, improvements, equipment designs, methods, processes and the like to the extent it is useful to research, develop, and commercially exploit carbonate fuel cells in applications in which the fuel cells concentrate carbon dioxide from industrial and power sources and for any other purpose attendant thereto or associated therewith. Such right and license is sublicensable to third parties performing work for or with EMRE or its affiliates, but shall not otherwise be sublicensable. Upon the payment by EMRE to the Company of $10.0 million, which was received by the Company on June 14, 2019, EMRE and its affiliates were fully vested in the rights and licenses granted in the EMRE License Agreement. Series B Preferred Stock No dividends were declared or paid by the Company on the Series B Preferred Stock in connection with the May 15, 2019 dividend payment date. Based on the dividend rate in effect on May 15, 2019, the aggregate amount of such dividend payment would have been $0.8 million. Because such dividends were not paid on May 15, under the terms of the Amended Certificate of Designation with respect to the Series B Preferred Stock, the holders of shares of Series B Preferred Stock will be entitled to receive, when, as and if, declared by the Board of Directors, dividends at the normal dividend rate plus an additional 25% of the unpaid dividend in subsequent dividend periods until the Company has paid or provided for the payment of all dividends on the shares of Series B Preferred Stock for all prior dividend periods. Thus, a total of $1.0 million would be payable with respect to the May 15 dividend period, if and when declared by the Board of Directors. Series C Preferred Stock Subsequent to April 30, 2019, the holders of the Series C Preferred Stock converted 1,618 Series C Preferred Shares into 1,658,861shares of common stock resulting in a reduction of $3.2 million, which represents the carrying value of the Series C Preferred Stock at April 30, 2019, to bring the amount of outstanding Series C Preferred Shares to zero and thus retirement of the instrument. Series D Preferred Stock As described in Note 12, “Redeemable Preferred Stock”, the holders of the Series D Preferred Stock have the right, As of June 13, 2019, due to conversions, there were 8,396 shares of Series D Preferred Stock issued and outstanding with a liquidation value of $8.4 million In the event of a triggering event (as defined in the Series D Certificate of Designation and summarized above), the holders of Series D Preferred Shares may require the Company to redeem such Series D Preferred Shares in cash at a price equal to the greater of  (a) 125% of the stated value of the Series D Preferred Shares being redeemed plus accrued dividends, if any, and (b) the market value of the number of shares issuable on conversion of the Series D Preferred Shares, valued at the greatest closing sales price during the period from the date immediately before the triggering event through the date the Company makes the redemption payment. NRG Loan Agreement On June 13, 2019, FuelCell Finance and NRG entered into a fourth amendment to the NRG Loan Agreement, which amends the definition of “Maturity Date” under the NRG Loan Agreement. Pursuant to the fourth amendment, the Maturity Date of each note is now the date that is the earlier of (a) July 12, 2019, (b) the commercial operation date or substantial completion date, as applicable, with respect to the fuel cell project owned by the borrower under such note, and (c) closing of a refinancing of indebtedness.

Nature of Business and Basis _2

Nature of Business and Basis of Presentation (Policies)	6 Months Ended
	Apr. 30, 2019
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, 2019 and 2018 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, 2018 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, 2018, 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. On May 8, 2019 at 5:00 p.m. Eastern time, the Company effected a 1-for-12 reverse stock split, reducing the number of the Company’s common shares outstanding on that date from 183,411,230 shares to 15,284,269 shares. The number of authorized shares of common stock remains unchanged at 225,000,000 shares and the number of authorized shares of preferred stock remains unchanged at 250,000 shares. Additionally, the conversion rate of our Series B Preferred Stock (as defined elsewhere herein), the conversion price of our Series C Preferred Stock and Series D Preferred Stock (each as defined elsewhere herein), the exchange price of our Series 1 Preferred Shares (as defined elsewhere herein), the exercise price of all outstanding options and warrants, and the number of shares reserved for future issuance pursuant to our equity compensation plans were all adjusted proportionately in connection with the reverse stock split. All share and per share amounts and conversion prices presented herein have been adjusted retroactively to reflect these changes. Certain reclassifications have been made to the prior year amounts to conform to the current year presentation. The Company adopted Accounting Standards Update ("ASU") 2014-09, "Revenue from Contracts with Customers (Topic 606)" effective November 1, 2018 and applied the modified retrospective transition method. As a result of the adoption of this ASU, Unbilled receivables has been reclassified as a separate line item from Accounts receivable, net on the Consolidated Balance Sheets and Unbilled receivables has been classified as a separate item from Accounts receivable, net in the Consolidated Statement of Cash Flows for the prior year period.
Going Concern and Liquidity Considerations	Going Concern and Liquidity Considerations The Company’s consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities and commitments in the normal course of business. The Company has significant short-term debt and other obligations currently due or maturing in less than one year, which are in excess of the Company’s cash and current asset balance, and the Company has been delaying certain payments to conserve cash. The Company has entered into a series of amendments to its senior secured debt facility with its senior lender Hercules Capital, Inc. (“Hercules”) in order to, among other things, provide for a lower minimum cash covenant and avoid events of default and acceleration of amounts due under the loan agreement. Most recently, Hercules provided an amendment through August 9, 2019. In exchange for this new amendment, the Company has agreed to pay down a portion of the outstanding principal amount in June 2019 as described below. The Company also has entered into amendments of its loan facility with NRG Energy Inc. (“NRG”) in order to extend the maturity date of the loan to July 12, 2019 as described below. Management has plans to address the Company’s current liquidity positon. These plans include exploring refinancing alternatives for the Company’s senior secured credit facility with Hercules. However, the Company may not be able to obtain such refinancing on acceptable terms, or at all. If the Company is not able to consummate such a refinancing transaction by August 9, 2019, and if Hercules is not willing to provide further accommodations, the Company could default on its obligations under its senior secured credit facility with Hercules. The occurrence of an event of default under the Hercules Agreement also constitute or may result in an event of default under, and cause or may cause the acceleration of, a number of material financial obligations including the State of Connecticut loan, the Connecticut Green Bank Loan and the Generate Lending, PNC and Fifth Third project finance facilities. The Company also has obtained an amendment of the loan agreement with NRG that has a maturity date of July 12, 2019. Management plans to continue to pursue project financing for the Company’s generation backlog. If the Company is unable to obtain such project financing, it may have events of default under its project finance agreements, which are further described in Note 15, “Debt and Financing Obligation.” Refer to Note 18, “Subsequent Events” for further information regarding the EMRE License Agreement The terms of any financing and other measures to obtain funds that may be undertaken by the Company may adversely affect the holdings or the rights of the Company’s stockholders. If the Company is unable to obtain funding, the Company could be forced to delay, reduce or eliminate some or all of its research and development efforts and commercialization efforts and sell intellectual property and other assets, which could adversely affect its business prospects, or the Company may be unable to continue operations. Although management continues to pursue these plans, there is no assurance that the Company will be successful in obtaining sufficient funding on terms acceptable to the Company to fund continuing operations, if at all. If the Company is unable to obtain external financing, it may not be able to sustain future operations. As a result, the Company may be required to delay, reduce and/or cease its operations and/or seek bankruptcy protection. Based on its recurring losses from operations, expectation of continuing operating losses for the foreseeable future, negative working capital, and need to raise additional capital to finance its future operations, the Company has concluded that there is substantial doubt about its ability to continue as a going concern for a period of one year after the date of filing of this Quarterly Report on Form 10-Q. The Company’s financial statements do not include any adjustments that might result from the outcome of this uncertainty. Accordingly, the financial statements have been prepared on a basis that assumes the Company will continue as a going concern and which contemplates the realization of assets and satisfaction of liabilities and commitments in the ordinary course of business.
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 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), income taxes 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.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Apr. 30, 2019
Topic 606 [Member]
Schedule of Impacts of Topic 606 on Consolidated Financial Statements	The cumulative effect of the changes made to the Company’s Consolidated Balance Sheets as of November 1, 2018 as a result of the adoption of Topic 606 was as follows: October 31, 2018 Adjustments due to Topic 606 Balance at November 1, 2018 ASSETS Unbilled receivables $ 13,759 $ 471 $ 14,230 Other assets 13,505 (132 ) 13,373 LIABILITIES Accrued liabilities $ 7,632 $ 995 $ 8,627 Deferred revenue, current portion 11,347 (240 ) 11,107 Long-term deferred revenue 16,793 6,238 23,031 EQUITY Accumulated deficit $ (990,867 ) $ (6,654 ) $ (997,521 ) The following tables summarize the impacts of Topic 606 on the Company’s consolidated financial statements. April 30, 2019 As reported Adjustments Balances without adoption of Topic 606 ASSETS Unbilled receivables $ 11,078 $ (342 ) $ 10,736 Other assets 20,251 (626 ) 19,625 LIABILITIES Accrued liabilities $ 10,954 $ (1,509 ) $ 9,445 Deferred revenue 16,331 (886 ) 15,445 Long-term deferred revenue 22,470 (6,696 ) 15,774 EQUITY Accumulated deficit $ (1,034,599 ) $ 8,123 $ (1,026,476 ) For the Three Months Ended April 30, 2019 As reported Adjustments Balances without adoption of Topic 606 Total revenues $ 9,216 $ 792 $ 10,008 Total cost of revenues 12,856 767 13,623 Gross loss (3,640 ) 25 (3,615 ) Administrative and selling expenses 9,805 — 9,805 Research and development expenses 4,178 — 4,178 Loss from operations (17,623 ) 25 (17,598 ) Interest expense (1,807 ) — (1,807 ) Other expense, net (31 ) — (31 ) Loss before provision for income taxes (19,461 ) 25 (19,436 ) Provision for income taxes (69 ) — (69 ) Net loss $ (19,530 ) $ 25 $ (19,505 ) For the Six Months Ended April 30, 2019 As reported Adjustments Balances without adoption of Topic 606 Total revenues $ 26,999 $ 2,340 $ 29,339 Total cost of revenues 32,844 1,042 33,886 Gross loss (5,845 ) 1,298 (4,547 ) Administrative and selling expenses 16,564 — 16,564 Research and development expenses 10,458 — 10,458 Loss from operations (32,867 ) 1,298 (31,569 ) Interest expense (4,271 ) — (4,271 ) Other income, net 129 — 129 Loss before provision for income taxes (37,009 ) 1,298 (35,711 ) Provision for income taxes (69 ) — (69 ) Net loss $ (37,078 ) $ 1,298 $ (35,780 )

Accounts Receivable, Net and _2

Accounts Receivable, Net and Unbilled Receivables (Tables)	6 Months Ended
	Apr. 30, 2019
Receivables [Abstract]
Schedule of Accounts Receivable, Net and Unbilled Receivables	Accounts receivable, net and Unbilled receivables as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Commercial Customers: Amount billed $ 10,626 $ 7,415 Unbilled receivables (1) 10,114 10,632 20,740 18,047 Advanced Technologies (including U.S. government (2) Amount billed 1,216 1,865 Unbilled receivables 964 3,127 2,180 4,992 Accounts receivable, net and unbilled receivables $ 22,920 $ 23,039 (1) Additional long-term unbilled receivables of $14.4 million and $9.4 million are included within “Other Assets” as of April 30, 2019 and October 31, 2018, respectively. (2) Total U.S. government accounts receivable, including unbilled receivables, outstanding as of April 30, 2019 and October 31, 2018 were $0.8 million and $2.3 million, respectively.

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Apr. 30, 2019
Inventory Disclosure [Abstract]
Components of Inventories	Inventories as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Raw materials $ 25,228 $ 24,467 Work-in-process (1) 31,815 29,108 Inventories $ 57,043 $ 53,575 (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, power plant orders or for use under the Company’s service agreements. Included in work-in-process as of April 30, 2019 and October 31, 2018 was $21.2 million and $19.0 million, respectively, of completed standard components.

Other Current Assets (Tables)

Other Current Assets (Tables)	6 Months Ended
	Apr. 30, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	Other current assets as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Advance payments to vendors (1) $ 1,565 $ 2,696 Deferred finance costs (2) 56 97 Prepaid expenses and other (3) 6,047 5,799 Other current assets $ 7,668 $ 8,592 (1) Advance payments to vendors relate to payments for inventory purchases ahead of receipt. (2) The April 30, 2019 balance represents direct deferred finance costs for securing the $100.0 million credit facility with Generate Lending, LLC which are being amortized over a one-year period and the October 31, 2018 balance represents direct deferred finance costs relating to securing the $40.0 million loan facility with NRG, which were being amortized over the five-year life of the facility. (3) Primarily relates to other prepaid expenses including insurance, rent and lease payments.

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Apr. 30, 2019
Other Assets Noncurrent [Abstract]
Schedule of Other Assets	Other assets as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Long-term stack residual value (1) $ 987 $ 1,206 Long-term unbilled receivables (2) 14,373 9,385 Other (3) 4,891 2,914 Other assets $ 20,251 $ 13,505 (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 twelve months from the balance sheet date. ( 3 ) The Company entered into an agreement with one of its customers on June 29, 2016 that includes a fee for the purchase of the power plants at the end of the term of the agreement. The fee is payable in installments over the term of the agreement and the total paid as of April 30, 2019 and October 31, 2018 was $2.3 million and $2.0 million, respectively. Also included within “Other” are long-term security deposits and as of April 30, 2019, prepaid withholding taxes on deferred revenue.

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	6 Months Ended
	Apr. 30, 2019
Accrued Liabilities Current [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Accrued payroll and employee benefits $ 2,599 $ 2,550 Accrued product warranty cost (1) 65 147 Accrued service agreement costs (2) 4,267 2,029 Accrued legal, taxes, professional and other 4,023 2,906 Accrued liabilities $ 10,954 $ 7,632 (1) Activity in the accrued product warranty costs for the six months ended April 30, 2019 represents reductions related to actual warranty spend of $0.08 million as contracts progress through the warranty period or are beyond the warranty period. ( 2 ) The loss accruals on service contracts were $0.9 million as of October 31, 2018 which increased to $1.9 million as of April 30, 2019. The accruals for performance guarantees increased from $1.1 million as of October 31, 2018 to $2.4 million as of April 30, 2019. The changes in the accruals are a result of the impact of the adoption of Topic 606.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Apr. 30, 2019
Equity [Abstract]
Schedule of Stockholders' Equity Note, Warrants or Rights	The following table summarizes outstanding warrant activity during the six months ended April 30, 2019: Series A Warrants Series C Warrants Balance as of October 31, 2018 640,000 964,114 Warrants exchanged (640,000 ) — Warrants exercised — — Warrants expired — — Balance as of April 30, 2019 — 964,114

Loss Per Share (Tables)

Loss Per Share (Tables)	6 Months Ended
	Apr. 30, 2019
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, 2019 2018 2019 2018 Numerator Net loss $ (19,530 ) $ (13,174 ) $ (37,078 ) $ (17,357 ) Series A warrant exchange (3,169 ) — (3,169 ) — Series B preferred stock dividends (800 ) (800 ) (1,600 ) (1,600 ) Series C preferred stock deemed contributions (dividends) and redemption value adjustment, net 1,599 (4,199 ) (7,406 ) (7,662 ) Series D Preferred stock deemed dividends and redemption accretion (976 ) — (6,661 ) — Net loss attributable to common stockholders $ (22,876 ) $ (18,173 ) $ (55,914 ) $ (26,619 ) Denominator Weighted average basic common shares 11,090,698 6,630,272 9,683,253 6,310,964 Effect of dilutive securities (1) — — — — Weighted average diluted common shares 11,090,698 6,630,272 9,683,253 6,310,964 Basic loss per share $ (2.06 ) $ (2.74 ) $ (5.77 ) $ (4.22 ) Diluted loss per share (1) $ (2.06 ) $ (2.74 ) $ (5.77 ) $ (4.22 ) (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 antidilutive. As of April 30, 2019 and 2018, 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	As of April 30, 2019 and 2018, potentially dilutive securities excluded from the diluted loss per share calculation are as follows: April 30, April 30, 2019 2018 May 2017 Offering - Series C Warrants 964,114 964,114 July 2016 Offering - Series A Warrants — 640,000 Outstanding options to purchase common stock 24,945 27,324 Unvested Restricted Stock Awards 32,659 98,788 Unvested Restricted Stock Units 212,034 258,737 Series C Preferred Shares to satisfy conversion requirements (1) 313,589 658,899 Series D Preferred Shares to satisfy conversion requirements (2) 1,114,890 — 5% Series B Cumulative Convertible Preferred Stock 37,837 37,837 Series 1 Preferred Shares to satisfy conversion requirements 1,264 1,264 Total potentially dilutive securities 2,701,332 2,686,963 (1) The number of shares of common stock issuable upon conversion of the Series C Preferred Stock was calculated using the liquidation preference value outstanding on April 30, 2019 of $1.6 million divided by the reduced conversion price of $5.16 and the liquidation preference of $14.5 million divided by the conversion price of $22.08 as of April 30, 2018. The actual number of shares issued could vary depending on the actual market price of the Company’s common shares on the date of such conversions. (2) The number of shares of common stock issuable upon conversion of the Series D Preferred Stock was calculated using the liquidation preference value outstanding on April 30, 2019 of $18.5 million divided by the conversion price of $16.56. The actual number of shares issued could vary depending on the actual market price of the Company’s common shares on the date of such conversions.

Debt and Financing Obligation (

Debt and Financing Obligation (Tables)	6 Months Ended
	Apr. 30, 2019
Debt [Abstract]
Schedule of Debt	Debt as of April 30, 2019 and October 31, 2018 consisted of the following: April 30, October 31, 2019 2018 Connecticut Development Authority Note $ — $ 284 Connecticut Green Bank Note 6,051 6,052 Finance obligation for sale-leaseback transactions 45,284 46,062 State of Connecticut Loan 10,000 10,000 Hercules Loan and Security Agreement 23,812 25,343 New Britain Renewable Energy Term Loan 792 1,107 NRG Loan Facility 5,750 — Generate Lending Construction Loan 10,000 — Enhanced Capital Loan and Security Agreement 1,500 — Fifth Third Bank Loan Agreement 11,072 — Capitalized lease obligations 249 341 Deferred finance costs (1,517 ) (1,311 ) Total debt and financing obligations $ 112,993 $ 87,878 Current portion of long-term debt and financing obligations (54,815 ) (17,596 ) Long-term debt and financing obligations $ 58,178 $ 70,282

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Apr. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Schedule of Non-Cancelable Minimum Payments Applicable to Operating and Capital Leases	Non-cancelable minimum payments applicable to operating and capital leases as of April 30, 2019 were as follows: Operating Leases Capital Leases Due Year 1 $ 814 $ 171 Due Year 2 470 61 Due Year 3 443 15 Due Year 4 422 2 Due Year 5 374 — Thereafter 2,817 — Total $ 5,340 $ 249

Nature of Business and Basis _3

Nature of Business and Basis of Presentation - Additional Information (Details) $ in Millions	Jun. 26, 2019USD ($)	Jun. 11, 2019USD ($)	May 08, 2019shares	May 07, 2019shares	Apr. 30, 2019shares	Oct. 31, 2018shares
Nature Of Business And Basis Of Presentation [Line Items]
Common stock, shares outstanding					13,709,330	7,972,686
Common stock, shares authorized					225,000,000	225,000,000
Preferred stock, shares authorized					250,000
EMRE [Member] | Hercules Capital, Inc. [Member] | Scenario Forecast [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Repayments of loan | $	$ 6
Subsequent Event [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Reverse stock split			1-for-12 reverse stock split
Reverse stock split, conversion ratio			0.084
Common stock, shares outstanding			15,284,269	183,411,230
Common stock, shares authorized			225,000,000
Preferred stock, shares authorized			250,000
Subsequent Event [Member] | Hercules Capital, Inc. [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Repayments of loan | $		$ 1.4
Subsequent Event [Member] | EMRE [Member]
Nature Of Business And Basis Of Presentation [Line Items]
License agreement payment received | $		$ 10

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements - Additional Information (Details) $ in Millions	Nov. 01, 2018USD ($)
ASU 2014-09 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect adjustment increase in Accumulated deficit	$ 6.7

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Cumulative Effect and Impacts of Topic 606 on Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Nov. 01, 2018	Oct. 31, 2018
ASSETS
Unbilled receivables	$ 11,078		$ 13,759
Other assets	20,251		13,505
LIABILITIES
Accrued liabilities	10,954		7,632
Deferred revenue, current portion	16,331		11,347
Long-term deferred revenue	22,470		16,793
EQUITY
Accumulated deficit	(1,034,599)		$ (990,867)
Topic 606 [Member]
ASSETS
Unbilled receivables		$ 14,230
Other assets		13,373
LIABILITIES
Accrued liabilities		8,627
Deferred revenue, current portion		11,107
Long-term deferred revenue		23,031
EQUITY
Accumulated deficit		(997,521)
Adjustments Due to Topic 606 [Member] | Topic 606 [Member]
ASSETS
Unbilled receivables	(342)	471
Other assets	(626)	(132)
LIABILITIES
Accrued liabilities	(1,509)	995
Deferred revenue, current portion	(886)	(240)
Long-term deferred revenue	(6,696)	6,238
EQUITY
Accumulated deficit	8,123	$ (6,654)
Balances Without Adoption of ASC 606 [Member] | Topic 606 [Member]
ASSETS
Unbilled receivables	10,736
Other assets	19,625
LIABILITIES
Accrued liabilities	9,445
Deferred revenue, current portion	15,445
Long-term deferred revenue	15,774
EQUITY
Accumulated deficit	$ (1,026,476)

Revenue Recognition - Schedul_2

Revenue Recognition - Schedule of Impacts of Topic 606 on Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 9,216,000	$ 20,830,000	$ 26,999,000	$ 59,443,000
Costs of revenues	12,856,000	21,459,000	32,844,000	55,437,000
Gross (loss) profit	(3,640,000)	(629,000)	(5,845,000)	4,006,000
Administrative and selling expenses	9,805,000	7,085,000	16,564,000	13,227,000
Research and development expenses	4,178,000	5,021,000	10,458,000	9,067,000
Loss from operations	(17,623,000)	(12,735,000)	(32,867,000)	(18,288,000)
Interest expense	(1,807,000)	(2,059,000)	(4,271,000)	(4,200,000)
Other income (expense), net	(31,000)	1,620,000	129,000	2,096,000
Loss before benefit (provision) for income taxes	(19,461,000)	(13,174,000)	(37,009,000)	(20,392,000)
(Provision) benefit for income taxes	(69,000)	0	(69,000)	3,035,000
Net loss	(19,530,000)	$ (13,174,000)	(37,078,000)	$ (17,357,000)
Adjustments Due to Topic 606 [Member] | Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	792,000		2,340,000
Costs of revenues	767,000		1,042,000
Gross (loss) profit	25,000		1,298,000
Loss from operations	25,000		1,298,000
Loss before benefit (provision) for income taxes	25,000		1,298,000
Net loss	25,000		1,298,000
Balances Without Adoption of ASC 606 [Member] | Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	10,008,000		29,339,000
Costs of revenues	13,623,000		33,886,000
Gross (loss) profit	(3,615,000)		(4,547,000)
Administrative and selling expenses	9,805,000		16,564,000
Research and development expenses	4,178,000		10,458,000
Loss from operations	(17,598,000)		(31,569,000)
Interest expense	(1,807,000)		(4,271,000)
Other income (expense), net	(31,000)		129,000
Loss before benefit (provision) for income taxes	(19,436,000)		(35,711,000)
(Provision) benefit for income taxes	(69,000)		(69,000)
Net loss	$ (19,505,000)		$ (35,780,000)

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Apr. 30, 2019	Oct. 31, 2018
Disaggregation Of Revenue [Line Items]
Contract asset	$ 25.5	$ 23.2
Transferred to accounts receivable	4.1
Contract liability	38.8	$ 28.1
Remaining performance obligations	321.6
Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Adjustment to net loss	$ 1.3

Restructuring and Impairment -

Restructuring and Impairment - Additional Information (Details)	Apr. 12, 2019USD ($)Employee	Apr. 30, 2019USD ($)	Apr. 30, 2019USD ($)
Restructuring Costs [Abstract]
Reduction in force of employess | Employee	135
Reduction in force of employee percentage	30.00%
Restructuring charges | $	$ 0	$ 2,800,000	$ 2,800,000

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, 2019	Oct. 31, 2018
Receivables [Abstract]
Contract receivable		$ 10,626	$ 7,415
Unbilled contracts receivables	[1]	10,114	10,632
Commercial customers accounts receivable		20,740	18,047
Advanced Technologies including U.S. government, Amount billed receivable		1,216	1,865
Advanced Technologies including U.S. government, Unbilled receivables		964	3,127
Advanced Technologies including U.S. government, Accounts receivable	[2]	2,180	4,992
Accounts receivable, net and unbilled receivables		$ 22,920	$ 23,039
[1]	Additional long-term unbilled receivables of $14.4 million and $9.4 million are included within “Other Assets” as of April 30, 2019 and October 31, 2018, respectively.
[2]	Total U.S. government accounts receivable, including unbilled receivables, outstanding as of April 30, 2019 and October 31, 2018 were $0.8 million and $2.3 million, respectively.

Accounts Receivable, Net and _4

Accounts Receivable, Net and Unbilled Receivables - Schedule of Accounts Receivable, Net and Unbilled Receivables (Details) (Parenthetical) - USD ($) $ in Millions	Apr. 30, 2019	Oct. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Long-term investments and receivables, net	$ 14.4	$ 9.4
Government [Member]
Accounts Notes And Loans Receivable [Line Items]
U.S. government accounts receivable, including unbilled receivables	$ 0.8	$ 2.3

Accounts Receivable, Net and _5

Accounts Receivable, Net and Unbilled Receivables - Additional Information (Details) - USD ($)	Apr. 30, 2019	Oct. 31, 2018
Receivables [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 0	$ 200,000

Inventories - Components of Inv

Inventories - Components of Inventories (Details) - USD ($) $ in Thousands		Apr. 30, 2019	Oct. 31, 2018
Inventory Disclosure [Abstract]
Raw materials		$ 25,228	$ 24,467
Work-in-process	[1]	31,815	29,108
Inventories		$ 57,043	$ 53,575
[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, power plant orders or for use under the Company’s service agreements. Included in work-in-process as of April 30, 2019 and October 31, 2018 was $21.2 million and $19.0 million, respectively, of completed standard components.

Inventories - Components of I_2

Inventories - Components of Inventories (Parenthetical) (Details) - USD ($) $ in Millions	Apr. 30, 2019	Oct. 31, 2018
Inventory Disclosure [Abstract]
Completed Standard Component	$ 21.2	$ 19

Inventories - Additional Inform

Inventories - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Costs of Revenues [Member]
Inventory [Line Items]
Excess plant capacity and manufacturing variances cost incurred	$ 3.4	$ 3.2	$ 6.6	$ 5.5

Project Assets - Additional Inf

Project Assets - Additional Information (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Apr. 30, 2019USD ($)ProjectAsset	Oct. 31, 2018USD ($)ProjectAsset
Project Assets [Abstract]
Long-term project assets	$ 123,136	$ 99,600
Number of project assets | ProjectAsset	5	5
Sale leaseback transaction, net book value	$ 26,100	$ 28,600
Long-term project assets construction in progress	$ 97,000	$ 71,000

Other Current Assets - Schedule

Other Current Assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands		Apr. 30, 2019	Oct. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Advance payments to vendors	[1]	$ 1,565	$ 2,696
Deferred finance costs	[2]	56	97
Prepaid expenses and other	[3]	6,047	5,799
Other current assets		$ 7,668	$ 8,592
[1]	Advance payments to vendors relate to payments for inventory purchases ahead of receipt.
[2]	The April 30, 2019 balance represents direct deferred finance costs for securing the $100.0 million credit facility with Generate Lending, LLC which are being amortized over a one-year period and the October 31, 2018 balance represents direct deferred finance costs relating to securing the $40.0 million loan facility with NRG, which were being amortized over the five-year life of the facility.
[3]	Primarily relates to other prepaid expenses including insurance, rent and lease payments.

Other Current Assets - Schedu_2

Other Current Assets - Schedule of Other Current Assets (Parenthetical) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Apr. 30, 2019	Oct. 31, 2018
Generate Lending, LLC [Member]
Other Current Assets [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100,000,000
Line of credit facility, expiration period	1 year
NRG Energy, Inc. [Member]
Other Current Assets [Line Items]
Line of credit facility, maximum borrowing capacity		$ 40,000,000
Line of credit facility, expiration period		5 years

Other Assets - Schedule of Othe

Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands		Apr. 30, 2019	Oct. 31, 2018
Other Assets Noncurrent [Abstract]
Long-term stack residual value	[1]	$ 987	$ 1,206
Long-term unbilled receivables	[2]	14,373	9,385
Other	[3]	4,891	2,914
Other assets		$ 20,251	$ 13,505
[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 twelve months from the balance sheet date.
[3]	The Company entered into an agreement with one of its customers on June 29, 2016 that includes a fee for the purchase of the power plants at the end of the term of the agreement. The fee is payable in installments over the term of the agreement and the total paid as of April 30, 2019 and October 31, 2018 was $2.3 million and $2.0 million, respectively. Also included within “Other” are long-term security deposits and as of April 30, 2019, prepaid withholding taxes on deferred revenue.

Other Assets - Schedule of Ot_2

Other Assets - Schedule of Other Assets (Parenthetical) (Details) $ in Millions	Apr. 30, 2019USD ($)	Oct. 31, 2018USD ($)	Jun. 29, 2016Customer
Other Assets Noncurrent [Abstract]
Number of customers under agreement | Customer			1
Contractual Obligation | $	$ 2.3	$ 2

Schedule of Accrued Liabilities

Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands		Apr. 30, 2019	Oct. 31, 2018
Accrued Liabilities Current [Abstract]
Accrued payroll and employee benefits		$ 2,599	$ 2,550
Accrued product warranty cost	[1]	65	147
Accrued service agreement costs	[2]	4,267	2,029
Accrued legal, taxes, professional and other		4,023	2,906
Accrued liabilities		$ 10,954	$ 7,632
[1]	Activity in the accrued product warranty costs for the six months ended April 30, 2019 represents reductions related to actual warranty spend of $0.08 million as contracts progress through the warranty period or are beyond the warranty period.
[2]	The loss accruals on service contracts were $0.9 million as of October 31, 2018 which increased to $1.9 million as of April 30, 2019. The accruals for performance guarantees increased from $1.1 million as of October 31, 2018 to $2.4 million as of April 30, 2019. The changes in the accruals are a result of the impact of the adoption of Topic 606.

Schedule of Accrued Liabiliti_2

Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2019	Oct. 31, 2018
Accrued Liabilities Current [Abstract]
Product warranty accrual, payment and adjustments	$ 80
Loss reserve on service agreements	1,900	$ 900
Reserve for performance guarantees	$ 2,400	$ 1,100

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 30, 2019	Feb. 21, 2019	Jun. 13, 2018	May 03, 2017	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2019	Oct. 31, 2018
Stockholders' Equity Note
Stock issued during period value, new issues						$ 90
Exchange Agreement [Member]
Stockholders' Equity Note
Common stock issued to warrant holders		500,000
Series C Warrants [Member]
Stockholders' Equity Note
Class of Warrant or Right, Outstanding	964,114				964,114		964,114	964,114
Series A Warrants [Member]
Stockholders' Equity Note
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 69.96				$ 69.96		$ 69.96
Class of Warrant or Right, Outstanding	640,000				640,000		640,000
Series A Warrant [Member]
Stockholders' Equity Note
Class of Warrant or Right, Outstanding								640,000
Fair value of the warrant pre-modification					$ 3,169		$ 3,169
Series A Warrant [Member] | Exchange Agreement [Member]
Stockholders' Equity Note
Fair value of the warrant pre-modification					300		300
Fair value of the shares at the date of the Exchange Agreement					$ 3,500		$ 3,500
Common Stock [Member] | Series C Warrants [Member]
Stockholders' Equity Note
Stock issued during period, shares, new issues							0
Common Stock [Member] | Series D Warrants [Member]
Stockholders' Equity Note
Stock issued during period, shares, new issues							0
At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member]
Stockholders' Equity Note
Percentage of sales commission			3.00%
At Market Issuance Sales Agreement [Member] | Maximum [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member]
Stockholders' Equity Note
Aggregate offering price			$ 50,000
At Market Issuance Sales Agreement [Member] | Common Stock [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member]
Stockholders' Equity Note
Stock issued during period, shares, new issues							0
Stock issued during period value, new issues	$ 8,000
At Market Issuance Sales Agreement [Member] | Common Stock [Member] | Maximum [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member]
Stockholders' Equity Note
Stock to be sold in future during period value new issues	$ 42,000
Underwritten Public Offering [Member]
Stockholders' Equity Note
Stock issued during period, shares, new issues				1,000,000
Underwritten Public Offering [Member] | Series C Warrants [Member]
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] | Series D Warrants [Member]
Stockholders' Equity Note
Class of warrants or rights issued				1,000,000

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Warrant Activity (Details)	6 Months Ended
	Apr. 30, 2019shares
Series A Warrant [Member]
Class of Warrant or Right, Outstanding	640,000
Common stock issued during period, warrants exchanged	(640,000)
Common stock issued during period, warrants exercised
Common stock issued during period, warrant expired
Series C Warrants [Member]
Class of Warrant or Right, Outstanding	964,114
Common stock issued during period, warrants exercised
Common stock issued during period, warrant expired
Class of Warrant or Right, Outstanding	964,114

Redeemable Preferred Stock - Ad

Redeemable Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Millions	Feb. 21, 2019USD ($)TradingDay$ / shares	Dec. 01, 2018USD ($)Installment	Aug. 29, 2018USD ($)shares	Nov. 01, 2017USD ($)Installment	Apr. 30, 2019USD ($)$ / sharesshares	Apr. 30, 2019CAD ($)shares	Apr. 30, 2018USD ($)$ / shares	Apr. 30, 2018CAD ($)	Apr. 30, 2019USD ($)TradingDay$ / sharesshares	Apr. 30, 2019CAD ($)TradingDayshares	Apr. 30, 2018USD ($)$ / shares	Apr. 30, 2018CAD ($)	Oct. 31, 2018USD ($)$ / sharesshares	Oct. 31, 2017$ / sharesshares	Jun. 13, 2019shares	Apr. 30, 2019CAD ($)shares	Jan. 31, 2019USD ($)	Jan. 02, 2019$ / shares	Dec. 17, 2018$ / shares	Dec. 03, 2018$ / shares	Oct. 31, 2018CAD ($)shares	Aug. 27, 2018$ / sharesshares	Aug. 26, 2018$ / shares
Class Of Stock [Line Items]
Preferred stock, shares authorized | shares					250,000				250,000							250,000
Preferred stock, par value | $ / shares					$ 0.01				$ 0.01
Convertible preferred stock, reduction in carrying amount					$ 10,400,000				$ 12,300,000
Waiver Agreement [Member]
Class Of Stock [Line Items]
Decrease in net loss attributable to common shareholders					$ 500,000
Installment Conversion of Series D Preferred Stock to Common Stock [Member]
Class Of Stock [Line Items]
Conversion of common stock, shares issued | shares					1,994,413	1,994,413			2,926,557	2,926,557
Convertible preferred stock, reduction in carrying amount					$ 6,300,000				$ 10,600,000
Series B Cumulative Convertible Perpetual Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized | shares					105,875				105,875				105,875			105,875					105,875
Preferred stock, dividend rate, percentage									5.00%	5.00%	5.00%	5.00%
Preferred stock sale of shares | shares					64,020				64,020				64,020			64,020					64,020
Preferred stock shares outstanding | shares					64,020				64,020				64,020			64,020					64,020
Temporary equity, carrying amount, attributable to parent					$ 59,857,000				$ 59,857,000				$ 59,857,000
Preferred stock redemption, stated value					$ 64,020,000				$ 64,020,000				$ 64,020,000
Preferred stock, liquidation preference per share | $ / shares					$ 1,000				$ 1,000				$ 1,000
Dividends, preferred stock, cash					$ 800,000		$ 800,000		$ 1,600,000		$ 1,600,000
Series D Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, dividend rate, percentage									15.00%	15.00%
Preferred stock sale of shares | shares			30,680		18,462				18,462				30,680		8,396	18,462					30,680
Conversion of stock conversion price | $ / shares					$ 16.56				$ 16.56
Proceeds from Issuance of preferred stock			$ 25,300,000
Preferred stock shares outstanding | shares					18,462				18,462				30,680		8,396	18,462					30,680
Temporary equity, carrying amount, attributable to parent					$ 20,546,000				$ 20,546,000				$ 27,392,000
Convertible preferred stock, converted into common stock | shares					6,964	6,964			12,218	12,218
Preferred stock deemed dividends					$ 1,000,000				$ 2,900,000
Preferred stock, redemption accretion value									$ 3,800,000
Percentage of lowest volume weighted average price of common stock considered as conversion price									85.00%	85.00%
Number of consecutive trading days | TradingDay									5	5
Conversion right description									The Series D Preferred Shares are convertible into shares of the Company’s common stock, subject to the beneficial ownership limitation provided in the Series D Certificate of Designation, at a conversion price equal to $16.56 per share of common stock, subject to adjustment as provided in the Series D Certificate of Designation, including adjustments if the Company sells shares of common stock or equity securities convertible into or exercisable for shares of common stock, at prices below $16.56 per share, in certain types of transactions.	The Series D Preferred Shares are convertible into shares of the Company’s common stock, subject to the beneficial ownership limitation provided in the Series D Certificate of Designation, at a conversion price equal to $16.56 per share of common stock, subject to adjustment as provided in the Series D Certificate of Designation, including adjustments if the Company sells shares of common stock or equity securities convertible into or exercisable for shares of common stock, at prices below $16.56 per share, in certain types of transactions.
Threshold percentage of reserved for issuance of common stock issuable upon conversion									150.00%	150.00%
Threshold amount to declare default amounts due on agreement					750,000				$ 750,000
Preferred stock redemption maturity date		Mar. 1, 2020
Number of preferred stock redemption equal installments | Installment		31
Preferred stock redemption, stated value		$ 30,680,000,000			$ 18,462,000				$ 18,462,000				30,680,000
Redemption of preferred shares in installments, each installment amount		$ 989,677
Reserving percentage of common stock to conversion of preferred shares		150.00%
Premium percentage of preferred stock installment amount		8.00%
Repayment percentage of installment amount									108.00%	108.00%
Preferred shares, triggering event redemption terms									Redemption Upon a Triggering Event. In the event of a triggering event (as defined in the Series D Certificate of Designation and summarized above), the holders of Series D Preferred Shares may require the Company to redeem such Series D Preferred Shares in cash at a price equal to the greater of (a) 125% of the stated value of the Series D Preferred Shares being redeemed plus accrued dividends, if any, and (b) the market value of the number of shares issuable on conversion of the Series D Preferred Shares, valued at the greatest closing sales price during the period from the date immediately before the triggering event through the date the Company makes the redemption payment.	Redemption Upon a Triggering Event. In the event of a triggering event (as defined in the Series D Certificate of Designation and summarized above), the holders of Series D Preferred Shares may require the Company to redeem such Series D Preferred Shares in cash at a price equal to the greater of (a) 125% of the stated value of the Series D Preferred Shares being redeemed plus accrued dividends, if any, and (b) the market value of the number of shares issuable on conversion of the Series D Preferred Shares, valued at the greatest closing sales price during the period from the date immediately before the triggering event through the date the Company makes the redemption payment.
Redemption pice percentage									125.00%	125.00%
Preferred shares, change of control, redemption terms									Redemption Upon a Change of Control. In the event of a change of control, as defined in the Series D Certificate of Designation, the holders of Series D Preferred Shares can force redemption at a price equal to the greater of (a) the conversion amount to be redeemed multiplied by 125%, (b) the product of (i) the conversion amount being redeemed multiplied by (ii) the quotient determined by dividing (A) the greatest closing sale price of the common stock on any Trading Day during the period commencing immediately preceding the earlier to occur of (1) the consummation of the applicable change of control and (2) the public announcement of such change of control and ending on the date such holder delivers the change of control redemption notice, by (B) the conversion price then in effect and (c) the product of (i) the conversion amount being redeemed multiplied by (ii) the quotient determined by dividing (A) the aggregate value of the cash and non-cash consideration per share of common stock being paid to holders of common stock in the change of control transaction by (B) the conversion price then in effect. Redemptions of the Series D Preferred Shares required under the Series D Certificate of Designation in connection with a change of control will have priority over payments to all other stockholders of the Company in connection with such change of control.	Redemption Upon a Change of Control. In the event of a change of control, as defined in the Series D Certificate of Designation, the holders of Series D Preferred Shares can force redemption at a price equal to the greater of (a) the conversion amount to be redeemed multiplied by 125%, (b) the product of (i) the conversion amount being redeemed multiplied by (ii) the quotient determined by dividing (A) the greatest closing sale price of the common stock on any Trading Day during the period commencing immediately preceding the earlier to occur of (1) the consummation of the applicable change of control and (2) the public announcement of such change of control and ending on the date such holder delivers the change of control redemption notice, by (B) the conversion price then in effect and (c) the product of (i) the conversion amount being redeemed multiplied by (ii) the quotient determined by dividing (A) the aggregate value of the cash and non-cash consideration per share of common stock being paid to holders of common stock in the change of control transaction by (B) the conversion price then in effect. Redemptions of the Series D Preferred Shares required under the Series D Certificate of Designation in connection with a change of control will have priority over payments to all other stockholders of the Company in connection with such change of control.
Preferred stock, participation rights									Limited Voting Rights. The holders of Series D Preferred Shares have no voting rights, except as required by law; provided, however, that any amendment to the Company’s certificate of incorporation or bylaws or the Series D Certificate of Designation that adversely affects the powers, preferences and rights of the Series D Preferred Stock requires the approval of the holders of a majority of the Series D Preferred Shares then outstanding. Participation Rights. Until August 29, 2019, the holders of the Series D Preferred Shares have the right to receive notice of and to participate in any offering, issuance or sale of equity or equity-equivalent securities by the Company or its subsidiaries, other than issuances under certain employee benefit plans, upon the conversion of certain options or other convertible securities, or pursuant to certain acquisitions or strategic transactions. Pursuant to such participation rights, the Company must offer to issue and sell to such holders at least 35% of the offered securities.	Limited Voting Rights. The holders of Series D Preferred Shares have no voting rights, except as required by law; provided, however, that any amendment to the Company’s certificate of incorporation or bylaws or the Series D Certificate of Designation that adversely affects the powers, preferences and rights of the Series D Preferred Stock requires the approval of the holders of a majority of the Series D Preferred Shares then outstanding. Participation Rights. Until August 29, 2019, the holders of the Series D Preferred Shares have the right to receive notice of and to participate in any offering, issuance or sale of equity or equity-equivalent securities by the Company or its subsidiaries, other than issuances under certain employee benefit plans, upon the conversion of certain options or other convertible securities, or pursuant to certain acquisitions or strategic transactions. Pursuant to such participation rights, the Company must offer to issue and sell to such holders at least 35% of the offered securities.
Series D Preferred Stock [Member] | Volume Weighted Average Price [Member]
Class Of Stock [Line Items]
Percentage of common stock on trading day immediately prior to applicable installment date									87.50%	87.50%
Series D Preferred Stock [Member] | Arithmetic Average Of Two Lowest Volume Weighted Average Price [Member]
Class Of Stock [Line Items]
Percentage of common stock on trading day immediately prior to applicable installment date									87.50%	87.50%
Common stock consecutive trading day | TradingDay									10	10
Series D Preferred Stock [Member] | Maximum [Member]
Class Of Stock [Line Items]
Conversion of stock conversion price | $ / shares					$ 16.56				$ 16.56
Series D Preferred Stock [Member] | Minimum [Member]
Class Of Stock [Line Items]
Preferred stock, conversion basis, stock issuance, threshold percentage of outstanding voting stock									20.00%	20.00%
Preferred stock, percentage of offered securities									35.00%	35.00%
Series D Preferred Stock [Member] | Convertible Preferred Offering [Member]
Class Of Stock [Line Items]
Percentage of lowest volume weighted average price of common stock considered as conversion price									85.00%	85.00%
Conversion terms, increase beneficial ownership limitation percentage upon notice periods									60 days	60 days
Series D Preferred Stock [Member] | Convertible Preferred Offering [Member] | Maximum [Member]
Class Of Stock [Line Items]
Conversion terms, beneficial ownership increase, percentage									9.99%	9.99%
Series D Preferred Stock [Member] | Convertible Preferred Offering [Member] | Minimum [Member]
Class Of Stock [Line Items]
Conversion terms, prior receiving beneficial ownership, percentage									20.00%	20.00%
Conversion terms, beneficial ownership limitation, percentage									4.99%	4.99%
Series D Preferred Stock [Member] | Convertible Preferred Offering [Member] | Oppenheimer & Co [Member]
Class Of Stock [Line Items]
Preferred stock, par value | $ / shares																						$ 0.01
Preferred stock sale of shares | shares																						30,680
Preferred stock, initial convertibel shares | shares																						1,852,657
Conversion of stock conversion price | $ / shares																						$ 16.56
Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, dividend rate, percentage									15.00%	15.00%
Conversion of stock conversion price | $ / shares					$ 5.16		$ 22.08		$ 5.16		$ 22.08											$ 18	$ 22.08
Temporary equity, carrying amount, attributable to parent					$ 3,162,000				$ 3,162,000				7,480,000
Convertible preferred stock, converted into common stock | shares					5,852	5,852			7,374	7,374
Preferred stock deemed dividends					$ 1,100,000				$ 600,000
Preferred stock redemption maturity date									Mar. 1, 2019	Mar. 1, 2019
Number of preferred stock redemption equal installments | Installment				33
Preferred stock redemption, stated value					1,618,000				$ 1,618,000				$ 8,992,000
Redemption of preferred shares in installments, each installment amount				$ 1,000,000
Common stock consecutive trading day | TradingDay									10	10
Repayment percentage of installment amount									108.00%	108.00%
Preferred shares, triggering event redemption terms									Redemption. In the event of a triggering event, as defined in the Series C Certificate of Designations, the holders of the Series C Preferred Shares could force redemption at a price equal to the greater of (a) the conversion amount to be redeemed multiplied by 125% and (b) the product of (i) the conversion rate with respect to the conversion amount in effect at such time as such holder delivers a triggering event redemption notice multiplied by (ii) the greatest closing sale price of the common stock on any trading day during the period commencing on the date immediately preceding such triggering event and ending on the date the Company makes the entire payment required.	Redemption. In the event of a triggering event, as defined in the Series C Certificate of Designations, the holders of the Series C Preferred Shares could force redemption at a price equal to the greater of (a) the conversion amount to be redeemed multiplied by 125% and (b) the product of (i) the conversion rate with respect to the conversion amount in effect at such time as such holder delivers a triggering event redemption notice multiplied by (ii) the greatest closing sale price of the common stock on any trading day during the period commencing on the date immediately preceding such triggering event and ending on the date the Company makes the entire payment required.
Redemption pice percentage									125.00%	125.00%
Adjusted conversion price | $ / shares																		$ 5.16	$ 6	$ 6.96
Preferred stock redemption terms									Installment Payments Prior to Execution of Waiver Agreement. On November 1, 2017 and on the sixteenth day and first day of each calendar month thereafter until March 1, 2019, subject to extension in certain circumstances (the “Series C Maturity Date”), inclusive, the Company was required to redeem the stated value of Series C Preferred Shares in thirty-three equal installments of approximately $1.0 million (each bimonthly amount, a “Series C Installment Amount” and the date of each such payment, a “Series C Installment Date”). The holders had the ability to defer installment payments, but not beyond the Series C Maturity Date. In addition, during each period commencing on the 11th trading day prior to a Series C Installment Date and prior to the immediately subsequent Series C Installment Date, the holders could elect to accelerate the conversion of Series C Preferred Shares at the then applicable installment conversion price, provided that the holders could not elect to effect any such acceleration during such installment period if either (a) in the aggregate, all the accelerations in such installment period would exceed the sum of three other Series C Installment Amounts, or (b) the number of Series C Preferred Shares subject to prior accelerations would exceed in the aggregate twelve Series C Installment Amounts.	Installment Payments Prior to Execution of Waiver Agreement. On November 1, 2017 and on the sixteenth day and first day of each calendar month thereafter until March 1, 2019, subject to extension in certain circumstances (the “Series C Maturity Date”), inclusive, the Company was required to redeem the stated value of Series C Preferred Shares in thirty-three equal installments of approximately $1.0 million (each bimonthly amount, a “Series C Installment Amount” and the date of each such payment, a “Series C Installment Date”). The holders had the ability to defer installment payments, but not beyond the Series C Maturity Date. In addition, during each period commencing on the 11th trading day prior to a Series C Installment Date and prior to the immediately subsequent Series C Installment Date, the holders could elect to accelerate the conversion of Series C Preferred Shares at the then applicable installment conversion price, provided that the holders could not elect to effect any such acceleration during such installment period if either (a) in the aggregate, all the accelerations in such installment period would exceed the sum of three other Series C Installment Amounts, or (b) the number of Series C Preferred Shares subject to prior accelerations would exceed in the aggregate twelve Series C Installment Amounts.
Preferred shares, dividends declared | $ / shares									$ 0				$ 0	$ 0
Preferred shares voting rights									no voting rights	no voting rights
Series C Preferred Stock [Member] | Waiver Agreement [Member]
Class Of Stock [Line Items]
Temporary equity, carrying amount, attributable to parent	$ 13,500,000
Percentage of lowest volume weighted average price of common stock considered as conversion price	85.00%
Number of consecutive trading days | TradingDay	20
Conversion right description									Under the Waiver Agreement, the conversion price of the Series C Preferred Stock is stated to be the lowest of (i) $4.45, (ii) 85% of the lowest closing bid price of the Company’s common stock during the period beginning on and including the fifth trading day prior to the date on which the applicable conversion notice is delivered to the Company and ending on and including the date on which the applicable conversion notice is delivered to the Company, and (iii) 85% of the quotient of (A) the sum of the five lowest VWAPs of the Company’s common stock during the twenty consecutive trading day period ending and including the trading day immediately preceding the applicable conversion date divided by (B) five (5).	Under the Waiver Agreement, the conversion price of the Series C Preferred Stock is stated to be the lowest of (i) $4.45, (ii) 85% of the lowest closing bid price of the Company’s common stock during the period beginning on and including the fifth trading day prior to the date on which the applicable conversion notice is delivered to the Company and ending on and including the date on which the applicable conversion notice is delivered to the Company, and (iii) 85% of the quotient of (A) the sum of the five lowest VWAPs of the Company’s common stock during the twenty consecutive trading day period ending and including the trading day immediately preceding the applicable conversion date divided by (B) five (5).
Percentage of shares will receive upon conversion prior to execution of waiver agreement	25.00%
Conversion price of preferred stock | $ / shares	$ 4.45
Percentage of conversion price of common stock	125.00%
Percentage of stated redemption value adjustment									108.00%	108.00%
Stated redemption value corresponding charge to common shareholders																	$ 8,600,000
Convertible preferred stock embedded conversion amount					$ 6,600,000
Change in fair value of convertible preferred stock	$ (500,000)
Series C Preferred Stock [Member] | Waiver Agreement [Member] | Volatility [Member]
Class Of Stock [Line Items]
Convertible preferred stock, measurement input	75.00%
Series C Preferred Stock [Member] | Waiver Agreement [Member] | Discount Rate [Member]
Class Of Stock [Line Items]
Convertible preferred stock, measurement input	20.00%
Series C Preferred Stock [Member] | Volume Weighted Average Price [Member]
Class Of Stock [Line Items]
Percentage of common stock on trading day immediately prior to applicable installment date									87.50%	87.50%
Series C Preferred Stock [Member] | Arithmetic Average Of Two Lowest Volume Weighted Average Price [Member]
Class Of Stock [Line Items]
Percentage of common stock on trading day immediately prior to applicable installment date									87.50%	87.50%
Series C Preferred Stock [Member] | Maximum [Member]
Class Of Stock [Line Items]
Adjusted conversion price | $ / shares					$ 4.45				$ 4.45
Series C Preferred Stock [Member] | Minimum [Member]
Class Of Stock [Line Items]
Adjusted conversion price | $ / shares					$ 2.51				$ 2.51
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member]
Class Of Stock [Line Items]
Preferred stock sale of shares | shares					1,618				1,618				8,992			1,618					8,992
Conversion of stock conversion price | $ / shares					$ 2.51				$ 2.51
Preferred stock shares outstanding | shares					1,618				1,618				8,992			1,618					8,992
Temporary equity, carrying amount, attributable to parent					$ 3,200,000				$ 3,200,000				$ 7,500,000
Percentage of lowest volume weighted average price of common stock considered as conversion price									85.00%	85.00%
Conversion right description									Conversion Rights. As of April 30, 2019, the Series C Preferred Shares were convertible into shares of common stock, subject to the beneficial ownership limitations provided in the Series C Certificate of Designations, at a conversion price equal to $2.51 per share. The conversion price was subject to adjustment as provided in the Series C Certificate of Designations, including adjustments if the Company sold shares of common stock or equity securities convertible into or exercisable for shares of common stock, at variable prices below the conversion price then in effect. Under the Series C Certificate of Designations, in the event of a triggering event, as defined in the Series C Certificate of Designations, the Series C Preferred Shares would have been convertible into shares of common stock at a conversion price equal to the lower of the conversion price then in effect and 85% of the lowest VWAP of the common stock of the five trading days immediately prior to delivery of the applicable conversion notice. The holders were prohibited from converting Series C Preferred Shares into shares of common stock if, as a result of such conversion, such holder, together with its affiliates, would own more than 8.99% of the total number of shares of common stock then issued and outstanding. Each holder had the right to increase its maximum percentage up to 9.99% upon 60 days’ notice to the Company.	Conversion Rights. As of April 30, 2019, the Series C Preferred Shares were convertible into shares of common stock, subject to the beneficial ownership limitations provided in the Series C Certificate of Designations, at a conversion price equal to $2.51 per share. The conversion price was subject to adjustment as provided in the Series C Certificate of Designations, including adjustments if the Company sold shares of common stock or equity securities convertible into or exercisable for shares of common stock, at variable prices below the conversion price then in effect. Under the Series C Certificate of Designations, in the event of a triggering event, as defined in the Series C Certificate of Designations, the Series C Preferred Shares would have been convertible into shares of common stock at a conversion price equal to the lower of the conversion price then in effect and 85% of the lowest VWAP of the common stock of the five trading days immediately prior to delivery of the applicable conversion notice. The holders were prohibited from converting Series C Preferred Shares into shares of common stock if, as a result of such conversion, such holder, together with its affiliates, would own more than 8.99% of the total number of shares of common stock then issued and outstanding. Each holder had the right to increase its maximum percentage up to 9.99% upon 60 days’ notice to the Company.
Conversion terms, increase beneficial ownership limitation percentage upon notice periods									60 days	60 days
Aggregate number of shares issued | shares														33,500
Sale of stock price per share | $ / shares														$ 0.01
Preferred stock, stated value per share | $ / shares														$ 1,000
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] | Waiver Agreement [Member]
Class Of Stock [Line Items]
Convertible preferred stock, reduction in carrying amount									$ 6,600,000
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] | Maximum [Member]
Class Of Stock [Line Items]
Conversion terms, beneficial ownership increase, percentage									9.99%	9.99%
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] | Minimum [Member]
Class Of Stock [Line Items]
Conversion terms, beneficial ownership limitation, percentage									8.99%	8.99%
Class A Cumulative Redeemable Exchangeable Preferred Shares [Member]
Class Of Stock [Line Items]
Preferred stock shares outstanding | shares					1,000,000				1,000,000							1,000,000
Return of capital and dividend payments										$ 0.3		$ 0.6
Interest expense, other						$ 0		$ 0.7		$ 0.7		$ 1.4
Carrying value of preferred shares, total					$ 15,900,000				$ 15,900,000				$ 15,900,000			$ 21.3					$ 20.9

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, 2019	Jan. 31, 2019	Apr. 30, 2018	Jan. 31, 2018	Apr. 30, 2019	Apr. 30, 2018
Numerator
Net loss		$ (19,530)		$ (13,174)		$ (37,078)	$ (17,357)
Preferred stock dividends		(800)	$ (800)	(800)	$ (800)
Net loss attributable to common stockholders		$ (22,876)		$ (18,173)		$ (55,914)	$ (26,619)
Denominator
Weighted average basic common shares		11,090,698		6,630,272		9,683,253	6,310,964
Effect of dilutive securities	[1]	0		0		0	0
Weighted average diluted common shares		11,090,698		6,630,272		9,683,253	6,310,964
Basic loss per share		$ (2.06)		$ (2.74)		$ (5.77)	$ (4.22)
Diluted loss per share	[1]	$ (2.06)		$ (2.74)		$ (5.77)	$ (4.22)
Series A Warrant [Member]
Numerator
Warrant exchange		$ (3,169)				$ (3,169)
Series B Preferred Stock [Member]
Numerator
Preferred stock dividends		(800)		$ (800)		(1,600)	$ (1,600)
Series C Preferred Stock [Member]
Numerator
Preferred stock deemed contributions (dividends) and redemption value adjustment, net		1,599		(4,199)		(7,406)	(7,662)
Series D Preferred Stock [Member]
Numerator
Preferred stock deemed dividends and redemption accretion		$ (976)		$ 0		$ (6,661)	$ 0
[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 antidilutive.

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, 2019	Apr. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation		2,701,332	2,686,963
Series C Warrants [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation		964,114	964,114
Series A Warrant [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation			640,000
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		24,945	27,324
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		32,659	98,788
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		212,034	258,737
Series C Preferred Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation	[1]	313,589	658,899
Series D Preferred Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation	[2]	1,114,890
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
Series 1 Preferred Shares [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from diluted loss per share calculation		1,264	1,264
[1]	The number of shares of common stock issuable upon conversion of the Series C Preferred Stock was calculated using the liquidation preference value outstanding on April 30, 2019 of $1.6 million divided by the reduced conversion price of $5.16 and the liquidation preference of $14.5 million divided by the conversion price of $22.08 as of April 30, 2018. The actual number of shares issued could vary depending on the actual market price of the Company’s common shares on the date of such conversions.
[2]	The number of shares of common stock issuable upon conversion of the Series D Preferred Stock was calculated using the liquidation preference value outstanding on April 30, 2019 of $18.5 million divided by the conversion price of $16.56. The actual number of shares issued could vary depending on the actual market price of the Company’s common shares on the date of such conversions.

Loss Per Share - Schedule of _2

Loss Per Share - Schedule of Potentially Dilutive Securities Excluded from the Diluted Loss Per Share Calculation (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 30, 2019	Aug. 27, 2018	Aug. 26, 2018	Apr. 30, 2018
Series C Preferred Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Preferred stock, liquidation preference value	$ 1.6
Preferred stock, liquidation preference value				$ 14.5
Conversion of stock conversion price	$ 5.16	$ 18	$ 22.08	$ 22.08
Series D Preferred Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Preferred stock, liquidation preference value	$ 18.5
Conversion of stock conversion price	$ 16.56

Restricted Cash - Additional In

Restricted Cash - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2019	Oct. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 38,100	$ 40,900
Restricted cash and cash equivalents - long-term	36,350	35,142
Reserves for obligations	$ 17,600	17,700
Letter of credit date of expiration	Aug. 31, 2028
Letters of credit outstanding, amount	$ 3,500	3,800
Dominion Bridgeport FuelCell Park [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents - long-term	$ 15,000	$ 15,000
Restricted cash and cash equivalents - long-term service agreement	15 years

Debt and Financing Obligation -

Debt and Financing Obligation - Schedule of Debt (Details) - USD ($)	Apr. 30, 2019	Dec. 13, 2018	Oct. 31, 2018	Nov. 30, 2015
Debt Instrument [Line Items]
Capitalized lease obligations	$ 249,000		$ 341,000
Deferred finance costs	(1,517,000)		(1,311,000)
Total debt and financing obligations	112,993,000		87,878,000
Current portion of long-term debt and financing obligations	(54,815,000)		(17,596,000)
Long-term debt and financing obligations	58,178,000		70,282,000
Connecticut Development Authority Note [Member]
Debt Instrument [Line Items]
Long-term Line of Credit			284,000
Connecticut Green Bank Note [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	6,051,000		6,052,000
Finance Obligation for Sale-Lease Back Transactions [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	45,284,000		46,062,000
State of Connecticut Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	10,000,000		10,000,000	$ 10,000,000
Hercules Capital, Inc. [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	23,812,000		25,343,000
New Britain Renewable Energy [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	792,000		$ 1,107,000
NRG Energy [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	5,750,000	$ 0
Generate Lending Construction Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	10,000,000
Enhanced Capital Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	1,500,000
Fifth Third Bank Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	$ 11,072,000

Debt and Financing Obligation_2

Debt and Financing Obligation - Additional Information (Details)

Jul. 12, 2019USD ($)

Apr. 30, 2019USD ($)

Apr. 01, 2019USD ($)

Mar. 29, 2019USD ($)

Feb. 28, 2019USD ($)MW

Jan. 09, 2019USD ($)

Dec. 31, 2018

Dec. 21, 2018USD ($)MW

Dec. 13, 2018USD ($)MW

Sep. 30, 2018

Jun. 30, 2018

Mar. 28, 2018USD ($)

Apr. 30, 2019USD ($)

Jan. 31, 2019USD ($)EmployeePosition

Nov. 30, 2015USD ($)Position

Jan. 31, 2018

Apr. 30, 2019USD ($)

Oct. 31, 2017

Apr. 01, 2020USD ($)

May 01, 2019

Oct. 31, 2018USD ($)

Oct. 01, 2018USD ($)

Nov. 30, 2016USD ($)

Apr. 30, 2016USD ($)

Debt Instrument [Line Items]

Lease payment term

36 months

36 months

36 months

Minimum [Member]

Debt Instrument [Line Items]

Optional project financing term

5 years

Connecticut Green Bank Note [Member]

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$ 5,900,000

$ 5,900,000

$ 5,900,000

Debt Instrument, Interest Rate, Stated Percentage

5.00%

5.00%

5.00%

Long-term Line of Credit

$ 6,051,000

$ 6,051,000

$ 6,051,000

$ 6,052,000

PNC Energy Capital, LLC [Member]

Debt Instrument [Line Items]

Long-term Line of Credit

45,300,000

45,300,000

$ 45,300,000

46,100,000

Term of loan

10 years

State of Connecticut [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

2.00%

Debt Instrument, Face Amount

$ 10,000,000

10,000,000

$ 10,000,000

$ 10,000,000

10,000,000

DebtInstrument term

15 years

Debt instrument, payment terms, period principal payments are deferred

4 years

Debt instrument, date of first required payment

Dec. 1, 2019

Loan forgiveness terms

if the Company created 165 full-time positions and retained 538 full-time positions for two consecutive years (the “Employment Obligation”) as measured on October 28, 2017 (the “Target Date”). The Assistance Agreement was subsequently amended in April 2017 to extend the Target Date by two years to October 28, 2019

State of Connecticut [Member] | Employment Obligation [Member]

Debt Instrument [Line Items]

Number of full time positions required to be created | Position

165

Number of full time positions required to be retained | Position

538

State of Connecticut [Member] | Employment Obligation [Member] | Second Amendment [Member]

Debt Instrument [Line Items]

Number of full time positions required to be maintained | Employee

538

Number of consecutive months maintain the full time positions

24 months

Additional number of full time positions required to be create | Position

91

Additional credits to be earned

$ 2,000,000

Principal payable number of employee under employee obligation target

$ 18,587.36

State of Connecticut [Member] | Maximum [Member]

Debt Instrument [Line Items]

Percentage of loan forgiveness

50.00%

Hercules Capital, Inc. [Member]

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$ 25,000,000

Long-term Line of Credit

$ 23,812,000

23,812,000

$ 23,812,000

25,343,000

Term of loan

30 months

Debt Instrument, Interest Rate, Stated Percentage Rate Range

10.90%

10.65%

10.40%

10.15%

9.90%

Other Deductions and Charges

1,700,000

$ 1,700,000

Loan Advance

$ 13,100,000

Maturity date

Apr. 1, 2020

Debt instrument, basis spread on variable rate

4.50%

Principal payments amortizing per month

$ 1,800,000

Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable

75.00%

50.00%

50.00%

75.00%

Hercules Capital, Inc. [Member] | Series C Preferred Stock [Member]

Debt Instrument [Line Items]

Debt instrument, amendment description

The Hercules Agreement, as amended, contains certain representations and warranties, affirmative and negative covenants, and events of default, including the occurrence of a circumstance that would reasonably be expected to have a material adverse effect, that entitle Hercules to cause the indebtedness under the agreement to become immediately due and payable. The occurrence of an event of default under the Hercules Agreement also constitute or may result in an event of default under, and cause or may cause the acceleration of a number of material financial obligations including the State of Connecticut loan, the Connecticut Green Bank Loan and the Generate Lending, PNC and Fifth Third project finance facilities. The occurrence of an event of default under the Hercules Agreement also constitute a triggering event under the Series D Certificate of Designations. As collateral for obligations under the Hercules Agreement, the Company granted Hercules a security interest in FuelCell Energy, Inc.’s existing and thereafter-acquired assets except for intellectual property and certain other excluded assets. The collateral does not include assets held by FuelCell Energy Finance, LLC (“FuelCell Finance”) or any project subsidiary thereof. The Company may continue to collateralize and finance its project subsidiaries through other lenders and partners.

Hercules Capital, Inc. [Member] | Scenario Forecast [Member]

Debt Instrument [Line Items]

Other Deductions and Charges

$ 900,000

Hercules Capital, Inc. [Member] | Maximum [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage Rate Range

10.00%

Hercules Capital, Inc. [Member] | Minimum [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage Rate Range

9.75%

Webster Bank Term Loan [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage Rate Range

5.00%

Notes Payable to Bank, Current

$ 800,000

800,000

$ 800,000

$ 1,100,000

$ 2,300,000

NRG Energy [Member]

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

40,000,000

40,000,000

40,000,000

Long-term Line of Credit

5,750,000

$ 0

5,750,000

$ 5,750,000

Non-refundable fee paid

$ 250,000

NRG Energy [Member] | Tulare BioMAT [Member] | California [Member]

Debt Instrument [Line Items]

Capacity of Plant | MW

2.8

NRG Energy [Member] | Central CA Fuel Cell 2, LLC [Member]

Debt Instrument [Line Items]

Loan Advance

$ 5,800,000

NRG Energy [Member] | Scenario Forecast [Member]

Debt Instrument [Line Items]

Non-refundable fee paid

$ 750,000

NRG Energy [Member] | Maximum [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage Rate Range

8.50%

NRG Energy [Member] | Minimum [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage Rate Range

8.00%

Generate Lending Construction Loan Agreement [Member]

Debt Instrument [Line Items]

Long-term Line of Credit

10,000,000

10,000,000

$ 10,000,000

Generate Lending Construction Loan Agreement [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member]

Debt Instrument [Line Items]

Loan Advance

$ 10,000,000

Debt instrument, basis spread on variable rate

9.50%

Percentage of construction budget

100.00%

Unlevered internal rate of return percentage to lender

10.00%

Availability period for working capital loans

36 months

Equity ownership

100.00%

Purchase price adjustment

50.00%

Draw down fee percentage

3.00%

Disposition fee percentage of total sale price

3.00%

Generate Lending Construction Loan Agreement [Member] | California [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] | Bolthouse Farms [Member]

Debt Instrument [Line Items]

Capacity of Plant | MW

5

Generate Lending Construction Loan Agreement [Member] | Maximum [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member]

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$ 300,000,000

Line of credit facility, current borrowing capacity

$ 100,000,000

Generate Lending Construction Loan Agreement [Member] | Minimum [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member]

Debt Instrument [Line Items]

Unlevered internal rate of return percentage to lender

10.00%

After-tax yield percentage

12.00%

Tranche One [Member]

Debt Instrument [Line Items]

Aggregate working capital loan amount minimum limit

$ 100,000,000

Aggregate working capital loan amount maximum limit

$ 200,000,000

Disposition fee percentage

2.00%

Tranche Two [Member]

Debt Instrument [Line Items]

Aggregate working capital loan amount minimum limit

$ 200,000,000

Aggregate working capital loan amount maximum limit

$ 300,000,000

Disposition fee percentage

1.00%

Enhanced Capital Loan and Security Agreement [Member]

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$ 1,500,000

Long-term Line of Credit

1,500,000

1,500,000

1,500,000

Debt instrument, basis spread on variable rate

6.00%

Debt instrument, maturity period description

The loan maturity date is three years from the date of the Enhanced Capital Loan Agreement upon which the outstanding principal and accrued interest will be payable.

Debt instrument, maturity period

3 years

New Construction Loan Facility [Member]

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$ 23,000,000

Loan Advance

$ 9,700,000

1,400,000

Maturity date

Oct. 31, 2019

Total outstanding balance

$ 11,100,000

$ 11,100,000

$ 11,100,000

New Construction Loan Facility [Member] | one-month LIBOR [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.25%

New Construction Loan Facility [Member] | Groton CT [Member]

Debt Instrument [Line Items]

Capacity of Plant | MW

7.4

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	2 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)		$ 69,000	$ 0	$ 69,000	$ (3,035,000)
U.S. federal corporate tax rate	34.00%			21.00%
Reduction of valuation allowance attributable to deferred tax assets				$ 2,000,000
IPR&D
Operating Loss Carryforwards [Line Items]
Reduction in deferred tax liability				$ 1,000,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2019	Oct. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Capitalized lease obligations	$ 249	$ 341
Lease Payment Terms	36 months
Recorded Unconditional Purchase Obligation	$ 48,100

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Non-Cancelable Minimum Payments Applicable to Operating and Capital Leases (Details) $ in Thousands	Apr. 30, 2019USD ($)
Commitments And Contingencies Disclosure [Abstract]
Operating Leases, due in one year	$ 814
Operating Leases, due in two years	470
Operating Leases, due in three years	443
Operating Leases, due in four years	422
Operating Leases, due in five years	374
Operating Leases, due thereafter	2,817
Operating Leases, future minimum payments due	5,340
Capital Leases, future minimum payments due, next twelve months	171
Capital Leases, future minimum payments due in two years	61
Capital Leases, future minimum payments due in three years	15
Capital Leases, future minimum payments due in four years	2
Capital Leases, future minimum payments due in five years	0
Capital Leases, future minimum payments due thereafter	0
Capital Leases, future minimum payments due	$ 249

Subsequent Events - Additional

Subsequent Events - Additional Information (Details)

Jun. 26, 2019USD ($)

Jun. 17, 2019USD ($)shares

Jun. 11, 2019USD ($)

Jun. 10, 2019$ / sharesshares

May 15, 2019USD ($)

May 09, 2019USD ($)MW

May 08, 2019USD ($)

Apr. 30, 2019USD ($)shares

Jan. 31, 2019USD ($)

Apr. 30, 2018USD ($)

Jan. 31, 2018USD ($)

Apr. 30, 2019USD ($)TradingDayshares

Apr. 30, 2018USD ($)

Jun. 13, 2019USD ($)shares

May 01, 2019

Apr. 01, 2019

Mar. 29, 2019

Feb. 28, 2019

Oct. 31, 2018USD ($)shares

Aug. 29, 2018shares

Subsequent Event [Line Items]

Divend declared

$ 800,000

$ 800,000

$ 800,000

$ 800,000

Convertible preferred stock, reduction in carrying amount

10,400,000

$ 12,300,000

Series B Cumulative Convertible Perpetual Preferred Stock [Member]

Subsequent Event [Line Items]

Divend declared

800,000

$ 800,000

$ 1,600,000

$ 1,600,000

Preferred stock, dividend rate, percentage

5.00%

5.00%

Temporary equity, carrying amount, attributable to parent

$ 59,857,000

$ 59,857,000

$ 59,857,000

Preferred stock sale of shares | shares

64,020

64,020

64,020

Preferred stock shares outstanding | shares

64,020

64,020

64,020

Series C Preferred Stock [Member]

Subsequent Event [Line Items]

Preferred stock, dividend rate, percentage

15.00%

Convertible preferred stock, converted into common stock | shares

5,852

7,374

Temporary equity, carrying amount, attributable to parent

$ 3,162,000

$ 3,162,000

$ 7,480,000

Redemption pice percentage

125.00%

Series D Preferred Stock [Member]

Subsequent Event [Line Items]

Preferred stock, dividend rate, percentage

15.00%

Convertible preferred stock, converted into common stock | shares

6,964

12,218

Temporary equity, carrying amount, attributable to parent

$ 20,546,000

$ 20,546,000

$ 27,392,000

Reduced conversion price | $ / shares

$ 0.4619

Percentage of lowest volume weighted average price of common stock considered as conversion price

85.00%

Number of consecutive trading days | TradingDay

5

Preferred stock sale of shares | shares

18,462

18,462

8,396

30,680

30,680

Preferred stock shares outstanding | shares

18,462

18,462

8,396

30,680

Preferred stock liquidation value

$ 8,400,000

Redemption pice percentage

125.00%

Common Stock [Member]

Subsequent Event [Line Items]

Shares issued due to conversion of series D preferred shares | shares

12,100,000

Hercules Capital, Inc. [Member]

Subsequent Event [Line Items]

Credit agreement, maturity date

Apr. 1, 2020

Debt instrument, basis spread on variable rate

4.50%

Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable

75.00%

75.00%

50.00%

50.00%

Hercules Capital, Inc. [Member] | Scenario Forecast [Member] | EMRE [Member]

Subsequent Event [Line Items]

Repayment of loan

$ 6,000,000

Subsequent Event [Member]

Subsequent Event [Line Items]

Default interest rate per annum

5.00%

Prepayment charge payment waive percentage on outstanding loan

2.00%

Convertible preferred stock, converted into number of common stock shares | shares

1,658,861

Subsequent Event [Member] | Series B Cumulative Convertible Perpetual Preferred Stock [Member]

Subsequent Event [Line Items]

Divend declared

$ 0

Dividends payment date

May 15, 2019

Aggregate amount of dividend payment

$ 800,000

Preferred stock, dividend rate, percentage

25.00%

Dividends payable

$ 1,000,000

Subsequent Event [Member] | Series C Preferred Stock [Member]

Subsequent Event [Line Items]

Convertible preferred stock, converted into common stock | shares

1,618

Convertible preferred stock, reduction in carrying amount

$ 3,200,000

Temporary equity, carrying amount, attributable to parent

$ 0

Subsequent Event [Member] | EMRE [Member]

Subsequent Event [Line Items]

License agreement payment

$ 4,000,000

$ 10,000,000

Subsequent Event [Member] | Hercules Capital, Inc. [Member]

Subsequent Event [Line Items]

Non-refundable fee paid

$ 250,000

Repayment of loan

1,400,000

Outstanding principal balance

$ 20,900,000

Subsequent Event [Member] | Hercules Capital, Inc. [Member] | Commencing on May 1, 2019 through 2:00 pm Eastern Time on June 7, 2019 [Member]

Subsequent Event [Line Items]

Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable

40.00%

Subsequent Event [Member] | Hercules Capital, Inc. [Member] | After 2:00 pm Eastern Time on June 7, 2019 [Member]

Subsequent Event [Line Items]

Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable

75.00%

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member]

Subsequent Event [Line Items]

Business acquisition, purchase price

$ 35,500,000

Working capital post-closing adjustment for purchase price

1,000,000

Restricted cash on hand

$ 15,000,000

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member]

Subsequent Event [Line Items]

Credit agreement, maturity date

May 9, 2025

Interest rate description

The interest rate under the Credit Agreement fluctuates monthly at the 30-day LIBOR rate plus 275 basis points

Debt instrument, interest rate basis term

30 days

Debt instrument, basis spread on variable rate

2.75%

Debt instrument, total notional value

$ 25,000,000

Debt instrument, covenant terms

The Credit Agreement also requires BFC to maintain a debt service reserve at each of Liberty Bank and Fifth Third of $1.25 million, which debt service reserves were funded on May 10, 2019, to be held in deposit accounts at each respective bank, with funds to be disbursed with the consent of or at the request of the required lenders in their sole discretion. Each of Liberty Bank and Fifth Third also has an operation and module replacement reserve (“O&M Reserve”) of $250.0 thousand, both of which were funded at closing, to be held in deposit accounts at each respective bank, and thereafter BFC is required to deposit $100.0 thousand per month into each O&M Reserve for the first five years of the Credit Agreement, with such funds to be released at the sole discretion of Liberty Bank and Fifth Third, as applicable. BFC is also required to maintain excess cash flow reserve accounts at each of Liberty Bank and Fifth Third and to deposit 50% of the excess cash flows from the Bridgeport Fuel Cell Project into these accounts. Excess cash flow consists of cash generated by BFC from the Bridgeport Fuel Cell Project after payment of all expenses (including after payment of service fees to the Company), debt service to Liberty Bank and Fifth Third, the funding of all required reserves, and payments to Connecticut Green Bank for the subordinated facility (as described below). BFC is also required to maintain a debt service coverage ratio of not less than 1.20, measured annually. The Credit Agreement contains customary representations, warranties and covenants.

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] | Minimum [Member]

Subsequent Event [Line Items]

Debt service coverage ratio

120.00%

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] | Interest Rate Swap [Member]

Subsequent Event [Line Items]

Derivative, fixed rate of interest

2.34%

Derivative, floating index rate

2.75%

Net interest rate

5.09%

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] | Fifth Third Bank [Member]

Subsequent Event [Line Items]

Proceeds from long-term lines of credit

$ 12,500,000

Debt service reserves required to be maintained and held in deposit accounts

1,250,000

Operation and module replacement reserves required to be maintained and held in deposit accounts

250,000

Operation and module replacement reserve to be deposited per month

$ 100,000

Percentage of excess cash flows to be maintained in accounts

50.00%

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] | Liberty Bank [Member]

Subsequent Event [Line Items]

Proceeds from long-term lines of credit

$ 12,500,000

Debt service reserves required to be maintained and held in deposit accounts

1,250,000

Operation and module replacement reserves required to be maintained and held in deposit accounts

250,000

Operation and module replacement reserve to be deposited per month

$ 100,000

Percentage of excess cash flows to be maintained in accounts

50.00%

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Subordinated Credit Agreement [Member]

Subsequent Event [Line Items]

Proceeds from long-term lines of credit

$ 6,000,000

Debt instrument, covenant terms

In addition, on May 9, 2019, in connection with the closing of the purchase of BFC, BFC entered into a subordinated credit agreement with the Connecticut Green Bank whereby Connecticut Green Bank provided financing in the amount of $6.0 million (the “Subordinated Credit Agreement”), $1.8 million of which was used to collateralize a letter of credit issued by Liberty Bank to satisfy a performance assurance requirement in the Energy Purchase Agreement with Connecticut Light and Power Company and the balance of which was applied toward outstanding principal on the Company’s existing indebtedness to Connecticut Green Bank. As security for the Subordinated Credit Agreement, Connecticut Green Bank received a perfected lien, subordinated and second in priority to the liens securing the $25.0 million (senior term loan amount) loaned under the Credit Agreement, in all of the same collateral securing the Credit Agreement. The interest rate under the Subordinated Credit Agreement is 8% per annum. A commitment fee of $60.0 thousand was earned by Connecticut Green Bank in connection with the closing. The debt service coverage ratio required to be maintained under the Subordinated Credit Agreement may not be less than 1.10 as of the end of each fiscal quarter. The term of the Subordinated Credit Agreement expires 7 years from the date of the advance of the loan. Principal and interest are due monthly in amounts sufficient to fully amortize the loan over an 84 month period. However, monthly debt service payments can accumulate in arrearages in the event that BFC does not have sufficient cash to make any monthly debt service payment. BFC has the right to make additional principal payments or pay the balance in full at any time without additional fees or penalties. The Subordinated Credit Agreement also contains customary representations, warranties and covenants.

Debt instrument, interest rate

8.00%

Line of credit, commitment fee

$ 60,000

DebtInstrument term

7 years

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Subordinated Credit Agreement [Member] | Letter of Credit [Member]

Subsequent Event [Line Items]

Line of credit collateral

$1.8

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Subordinated Credit Agreement [Member] | Senior Term Loan [Member]

Subsequent Event [Line Items]

Liens securing senior term loan amount

$ 25,000,000

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Subordinated Credit Agreement [Member] | Minimum [Member]

Subsequent Event [Line Items]

Debt service coverage ratio

110.00%

Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Bridgeport, Connecticut [Member]

Subsequent Event [Line Items]

Capacity of Plant | MW

14.9

Plant operation period

5 years