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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 ($)
MW
Jun. 30, 2017
MW
Oct. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]            
Debt issuance costs, deduction of current portion of long term debt [1]     $ 129,000 $ 129,000 $ 152,000  
Debt issuance costs, deduction of long-term debt and other liabilities [2]     97,000 97,000 225,000  
Restricted Cash and Cash Equivalents     38,200,000 38,200,000 34,100,000  
Restricted cash and cash equivalents - long-term     33,526,000 33,526,000 24,692,000  
Letters of Credit Outstanding, Amount     2,900,000 $ 2,900,000 7,900,000  
Letter of Credit Date of Expiration       Apr. 01, 2019    
Customer Advances, Current     3,000,000 $ 3,000,000 5,300,000  
Short-term project assets     0 0    
Impairment charges       0 0 $ 0
Revenue       $ 7,233,000 1,267,000  
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 [3]     348,000 $ 348,000 516,000  
Reserve for Performance Guarantees     2,200,000 2,200,000 3,300,000  
Loss reserve on service agreements     1,100,000 1,100,000 2,700,000  
Long-term stack residual value [4]     987,000 987,000 0  
Future License Fees To Be Paid     18,000,000 $ 18,000,000    
Reduced royalty percentage       3.00%    
Foreign Currency Transaction Gain (Loss), Unrealized       $ (700,000) $ 300,000 $ 1,700,000
Sales Revenue Net [Member] | Customer Concentration Risk [Member]            
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]            
Significant customer revenue percentage       78.00% 75.00% 90.00%
Service and License Fee Revenues [Member]            
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]            
License Fee and Royalty Income       $ 2,700,000 $ 6,200,000 $ 3,900,000
Stack Technology Transfer and License Agreement [Member]            
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]            
Upfront License Fee     7,000,000 7,000,000    
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 $ 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       11.00% 6.00% 3.00%
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 represent in excess value of contract $ 60,000,000          
Revenue     $ 39,000,000      
Accounting Standards Update 2015-03 [Member] | Current Assets [Member]            
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]            
Debt issuance costs, deduction of current portion of long term debt         $ 300,000  
Reclassification of debt issuance costs to be direct deduction of current portion of long term debt         300,000  
Accounting Standards Update 2015-03 [Member] | Other Assets [Member]            
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]            
Debt issuance costs, deduction of long-term debt and other liabilities         1,100,000  
Accounting Standards Update 2015-03 [Member] | Other Assets, Net [Member]            
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]            
Reclassification of debt issuance costs to be direct deduction of long-term debt and other liabilities         $ 1,100,000  
[1] Represents the current portion of direct deferred finance costs that relate primarily to securing a $40.0 million loan facility with NRG which is being amortized over the five-year life of the facility.
[2] Represents the long-term portion of direct deferred finance costs relating to the Company’s loan facility with NRG which is being amortized over the five-year life of the facility.
[3] Activity in the accrued product warranty costs for the years ended October 31, 2017 and 2016 included additions for estimates of future warranty obligations of $0.6 million and $0.3 million, respectively, on contracts in the warranty period and reductions related to actual warranty spend of $0.8 million and $0.7 million, respectively, as contracts progress through the warranty period or are beyond the warranty period.
[4] 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. The increase from October 31, 2016 represents residual value for two module replacements performed during the year ended October 31, 2017.