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Nature of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Jan. 01, 2020 | Nov. 30, 2019 USD ($) | Nov. 22, 2019 USD ($) | Nov. 05, 2019 USD ($) | Jul. 31, 2019 USD ($) | May 08, 2019 shares | Nov. 01, 2018 USD ($) | Aug. 29, 2017 USD ($) MW | Jun. 30, 2017 MW | Oct. 31, 2017 USD ($) shares | Oct. 31, 2020 USD ($) | Oct. 31, 2019 USD ($) shares | Oct. 31, 2018 USD ($) shares | Oct. 31, 2017 USD ($) shares | Jan. 14, 2020 shares | Jan. 10, 2020 shares | May 09, 2019 USD ($) | May 07, 2019 shares | Apr. 04, 2019 shares | Apr. 30, 2017 shares | Oct. 31, 2016 shares
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  |  |  |  |  |  | 1-for-12 reverse stock split |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, conversion ratio |  |  |  |  |  |  | 0.084 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | shares |  |  |  |  |  |  | 15,284,269 |  |  |  |  |  | 193,608,684 | 7,972,686 |  |  |  |  | 183,411,230 |  |  |
Common stock, shares authorized | shares |  |  |  |  |  |  | 225,000,000 |  |  |  | 125,000,000 |  | 225,000,000 | 225,000,000 | 125,000,000 |  |  |  |  |  |  | 75,000,000
Preferred stock, shares authorized | shares |  |  |  |  |  |  | 250,000 |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,786,000 | $ 22,817,000 | $ 20,398,000 |  |  |  |  |  |  |
Common stock, shares reserved for issuance | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |
Restricted Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  | 30,300,000 | 40,900,000 |  |  |  |  |  |  |  |
Restricted cash and cash equivalents - long-term |  |  |  |  |  |  |  |  |  |  |  |  | 26,871,000 | 35,142,000 |  |  |  |  |  |  |  |
Reserves for obligations |  |  |  |  |  |  |  |  |  |  |  |  | 17,900,000 | 17,700,000 |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,700,000 | 3,800,000 |  |  |  |  |  |  |  |
Letter of Credit Date of Expiration |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2025 |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 0 |  |  |  |  |  |  | $ 0 | 0 | 0 |  |  |  |  |  |  |
Extended Product Warranty Description |  |  |  |  |  |  |  |  |  |  |  |  | We warranty our products for a specific period of time against manufacturing or performance defects. Our U.S. warranty is limited to a term generally 15 months after shipment or 12 months after acceptance of our products. |  |  |  |  |  |  |  |  |
Product Warranty Accrual | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 144,000 | 147,000 |  |  |  |  |  |  |  |
Reserve for Performance Guarantees |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 | 1,100,000 |  |  |  |  |  |  |  |
Loss reserve on service agreements |  |  |  |  |  |  |  |  |  |  |  |  | 3,300,000 | 900,000 |  |  |  |  |  |  |  |
Long-term stack residual value | [2] |  |  |  |  |  |  |  |  |  |  |  | 987,000 | 1,206,000 |  |  |  |  |  |  |  |
Foreign Currency Transaction (Losses) Gains, Net |  |  |  |  |  |  |  |  |  |  |  |  | (100,000) | $ 300,000 | $ (700,000) |  |  |  |  |  |  |
Operating lease liability |  |  |  |  |  |  |  |  |  |  |  |  | 10,300,000 |  |  |  |  |  |  |  |  |
ROU assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,100,000 |  |  |  |  |  |  |  |  |
ASU 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment increase in Accumulated deficit |  |  |  |  |  |  |  | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant customer revenue percentage |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% | 86.00% | 79.00% |  |  |  |  |  |  |
Bridgeport Fuel Cell Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
Dominion Bridgeport FuelCell Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents - long-term |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |
Restricted cash and cash equivalents - long-term service agreement |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Dominion Bridgeport FuelCell Park [Member] | Sales Revenue Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant customer revenue percentage |  |  |  |  |  |  |  |  |  |  |  |  | 13.00% | 3.00% | 11.00% |  |  |  |  |  |  |
Hanyang Industrial Development Co., Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of MW awarded | MW |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |
Contract to sell fuel cell plants | MW |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Project represented value of contract |  |  |  |  |  |  |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Hanyang Industrial Development Co., Ltd [Member] | Electricity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | $ 39,000,000 |  |  | $ 31,000,000 |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 5,791,068 |  | 193,608,684 | 7,972,686 | 5,791,068 |  |  |  |  |  |  | 2,931,202
Series 1 Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Joint Development Agreement [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payments eligible for achievement |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 335,000,000 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares reserved for issuance | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,290,934 |  |  |  |  |  |
Subsequent Event [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares available for issuance | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,034,001 |  |  |  |  |  |
Subsequent Event [Member] | Series 1 Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares reserved for issuance | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,603,681 |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Initial Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Second Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 65,500,000 |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Second Funding [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  | $ 65,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Remainder of Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit receivable amount |  |  |  |  |  |  |  |  |  |  |  |  | 120,000,000 |  |  |  |  |  |  |  |  |
Exxon Mobile Research And Engineering Company [Member] | Subsequent Event [Member] | Joint Development Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for exclusivity and technology access fee |  |  | $ 5,000,000 |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exxon Mobile Research And Engineering Company [Member] | Subsequent Event [Member] | Maximum [Member] | Joint Development Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  | 45,000,000 |  | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone-based payments |  |  | $ 10,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing and License Arrangement [Member] | Exxon Mobile Research And Engineering Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up-front proceeds |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
[1] | Activity in the accrued product warranty costs for the years ended October 31, 2019 and 2018 included additions for estimates of future warranty obligations of $0.1 million and $0.4 million, respectively, on contracts in the warranty period and reductions related to actual warranty spend of $0.1 million and $0.6 million, respectively, as contracts progress through the warranty period or are beyond the warranty period.
[2] | 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.

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