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Acquisition - Additional Information (Details)
 12 Months Ended
May 09, 2019
USD ($)
MW
Oct. 31, 2019
Bridgeport Fuel Cell, LLC [Member]    
Business Acquisition [Line Items]    
Business acquisition, cash purchase price $ 35,500,000  
Working capital post-closing adjustment for purchase price 1,000,000  
Purchase price, estimated working capital adjustment 600,000  
Accounts receivable 2,700,000  
Unbilled receivables 15,300,000  
Accrued performance guarantees 1,300,000  
Assets acquired, fuel cell power plants installation 38,800,000  
Assets acquired, power purchase agreement 12,300,000  
Gain or loss recorded for pre-existing service agreement $ 0  
Remaining amortization period   10 years
Bridgeport Fuel Cell, LLC [Member] | Project Asset [Member] | Balance of Plant Assets [Member]    
Business Acquisition [Line Items]    
Project assets estimated remaining useful lives   15 years
Bridgeport Fuel Cell, LLC [Member] | Project Asset [Member] | Minimum [Member] | Fuel Cell Modules [Member]    
Business Acquisition [Line Items]    
Project assets estimated remaining useful lives   1 year
Bridgeport Fuel Cell, LLC [Member] | Project Asset [Member] | Maximum [Member] | Fuel Cell Modules [Member]    
Business Acquisition [Line Items]    
Project assets estimated remaining useful lives   7 years
Bridgeport Fuel Cell, LLC [Member] | Bridgeport, Connecticut [Member]    
Business Acquisition [Line Items]    
Capacity of plant | MW 14.9  
Plant operation period 2013-12  
Bridgeport Fuel Cell Project [Member]    
Business Acquisition [Line Items]    
Restricted cash $ 15,000,000