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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
--- | --- | --- | --- | ---
Aug. 29, 2017 USD ($) MW | Jun. 30, 2017 MW | Oct. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($)
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents |  |  |  | $ 40,900,000 |  |  |  | $ 38,200,000 |  |  |  | $ 40,900,000 | $ 38,200,000 |
Restricted cash and cash equivalents - long-term |  |  |  | 35,142,000 |  |  |  | 33,526,000 |  |  |  | 35,142,000 | 33,526,000 |
Letters of Credit Outstanding, Amount |  |  |  | 3,800,000 |  |  |  | 2,900,000 |  |  |  | $ 3,800,000 | 2,900,000 |
Letter of Credit Date of Expiration |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2025 |  |
Customer Advances, Current |  |  |  | 3,000 |  |  |  | 3,000,000 |  |  |  | $ 3,000 | 3,000,000 |
Short-term project assets |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 0
Impairment on project asset |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 0 | 0
Revenue |  |  |  | 17,884,000 | $ 12,110,000 | $ 20,830,000 | $ 38,613,000 | 47,889,000 | $ 10,358,000 | $ 20,417,000 | $ 17,002,000 | $ 89,437,000 | 95,666,000 | 108,252,000
Excess service agreements term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
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] |  |  | 147,000 |  |  |  | 348,000 |  |  |  | $ 147,000 | 348,000 |
Reserve for Performance Guarantees |  |  |  | 1,100,000 |  |  |  | 2,200,000 |  |  |  | 1,100,000 | 2,200,000 |
Loss reserve on service agreements |  |  |  | 900,000 |  |  |  | 1,100,000 |  |  |  | 900,000 | 1,100,000 |
Long-term stack residual value | [2] |  |  | 1,206,000 |  |  |  | 987,000 |  |  |  | 1,206,000 | 987,000 |
Future license fees to be paid |  |  |  |  |  |  |  |  |  |  |  | $ 18,000,000 |  |
License agreement amortization period |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |
Reduced royalty percentage |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |
Foreign Currency Transaction Gain (Loss), Unrealized |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 | (700,000) | $ 300,000
Net operating loss carryforwards |  |  |  | 202,643,000 |  |  |  | 282,022,000 |  |  |  | 202,643,000 | 282,022,000 |
Accumulated deficit |  |  |  | (990,867,000) |  |  |  | (943,533,000) |  |  |  | (990,867,000) | $ (943,533,000) |
ASU 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net impact on equity |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Net operating loss carryforwards |  |  |  | 7,800,000 |  |  |  |  |  |  |  | 7,800,000 |  |
Unrecognized net operating loss carryforwards offset by valuation allowance |  |  |  | 7,800,000 |  |  |  |  |  |  |  | 7,800,000 |  |
ASU 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  | 7,000 |  |  |  |  |  |  |  | 7,000 |  |
ASU 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  | 10,000 |  |  |  |  |  |  |  | $ 10,000 |  |
Sales Revenue Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant customer revenue percentage |  |  |  |  |  |  |  |  |  |  |  | 84.00% | 78.00% | 75.00%
Stack Technology Transfer and License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront License Fee |  |  |  | 10,000,000 |  |  |  |  |  |  |  | $ 10,000,000 |  |
Service and License Fee Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
License Fee and Royalty Income |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 | $ 2,700,000 | $ 6,200,000
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 |  |  |  | 15,000,000 |  |  |  | $ 15,000,000 | $ 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 |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 11.00% | 6.00%
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 |  |
[1] | Activity in the accrued product warranty costs for the years ended October 31, 2018 and 2017 included additions for estimates of future warranty obligations of $0.4 million and $0.6 million, respectively, on contracts in the warranty period and reductions related to actual warranty spend of $0.6 million and $0.8 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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