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Nature of Business and Basis of Presentation - Additional Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended 16 Months Ended
Oct. 31, 2023
USD ($)
loanfacility
shares
Jul. 12, 2023
shares
May 19, 2023
USD ($)
Aug. 04, 2021
USD ($)
Jun. 11, 2021
USD ($)
Aug. 31, 2021
USD ($)
MW
Oct. 31, 2023
USD ($)
loanfacility
Plant
MW
shares
Apr. 30, 2022
USD ($)
$ / shares
shares
Oct. 31, 2023
USD ($)
loanfacility
Plant
$ / shares
MW
shares
Oct. 31, 2022
USD ($)
$ / shares
shares
Oct. 31, 2021
USD ($)
shares
Oct. 31, 2023
USD ($)
loanfacility
$ / shares
shares
Jul. 07, 2022
USD ($)
Nature of Business and Basis of Presentation                          
Cash and cash equivalents, unrestricted $ 249,952           $ 249,952   $ 249,952 $ 458,055   $ 249,952  
Investments - short-term $ 103,760           $ 103,760   103,760     $ 103,760  
Proceeds from the issuance of debt                 $ 100,500   $ 10,175    
Number of Term Loan Facilities | loanfacility 2           2   2     2  
Allowance for doubtful accounts or credit losses $ 0           $ 0   $ 0 0   $ 0  
Impairment of goodwill                 $ 0 0 0    
Percentage of electricity output provided to customers                 100.00%        
Extended Product Warranty Description                 We warranty our products for a specific period of time against manufacturing or performance defects. Our U.S. warranty is generally limited to a term of 15 months after shipment or 12 months after acceptance of our products.        
Extended product warranty period after shipment                 15 months        
Extended product warranty period after acceptance of products                 12 months        
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax                 $ (400) (900) $ (900)    
Senior Back Leverage Loan Facility                          
Nature of Business and Basis of Presentation                          
Gross proceeds from debt             20,000            
Maximum                          
Nature of Business and Basis of Presentation                          
Operating and finance lease, remaining lease term                 26 years        
Minimum                          
Nature of Business and Basis of Presentation                          
Operating and finance lease, remaining lease term                 1 year        
US Treasury Securities                          
Nature of Business and Basis of Presentation                          
Investments - short-term 103,800           103,800   $ 103,800 $ 0   103,800  
OpCo Financing Facility                          
Nature of Business and Basis of Presentation                          
Proceeds from the issuance of debt     $ 77,600           80,500        
Net proceeds from issuance debt                 46,100        
Unrestricted cash     46,100                    
Funds Released from Restricted Cash     $ 11,200                    
East West Bank Partnership Flip Transaction                          
Nature of Business and Basis of Presentation                          
Capacity Of Plant | MW           7.4              
Closing costs       $ 800                  
Tax Equity Financing Commitment           $ 15,000             $ 12,000
Remaining amount of draw       $ 12,000                  
Tax equity financing transactions with Franklin Park                          
Nature of Business and Basis of Presentation                          
Closing costs             $ 1,800   $ 1,800        
Number of Fuel Cell Power Plants, Tax Equity Financing Transaction | Plant             2   2        
Tax Equity Financing Commitment 30,200           $ 30,200   $ 30,200     $ 30,200  
Tax equity financing transaction, commitment amount received $ 9,100               $ 9,100        
Common Stock                          
Nature of Business and Basis of Presentation                          
Stock issued during period shares new issues | shares                 44,320,825 38,396,904 69,074,573    
Common Stock | 2022 Open Market Sale Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC                          
Nature of Business and Basis of Presentation                          
Shares sold during the period | shares                 44,300,000     62,800,000  
Average sale price per share | $ / shares                 $ 2.25     $ 2.66  
Gross proceeds from issuance of common stock                 $ 99,700     $ 166,800  
Shares remaining under the plan | shares 32,200,000           32,200,000   32,200,000     32,200,000  
Common Stock | 2022 Open Market Sale Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Maximum                          
Nature of Business and Basis of Presentation                          
Stock issued during period shares new issues | shares   95,000,000.0                      
Common Stock | 2021 Open Market Sale Agreement | Jefferies LLC and Barclays Capital Inc.                          
Nature of Business and Basis of Presentation                          
Aggregate offering price         $ 500,000                
Average sale price per share | $ / shares               $ 7.79   $ 6.07      
Stock issued during period shares new issues | shares               64,000,000.0   19,900,000      
Gross proceeds from issuance of common stock               $ 498,100   $ 120,800      
Derby Project                          
Nature of Business and Basis of Presentation                          
Proceeds from License Fees Received             $ 500            
Derby Project | Tax equity financing transactions with Franklin Park                          
Nature of Business and Basis of Presentation                          
Percentage of Cash and Tax Allocations to be Received                 95.00%        
Remaining amount of draw $ 20,600           $ 20,600   $ 20,600     $ 20,600  
Derby Project 14.0 Mega Watt | Tax equity financing transactions with Franklin Park                          
Nature of Business and Basis of Presentation                          
Capacity Of Plant | MW             14.0   14.0        
Derby Project 2.8 Mega Watt | Tax equity financing transactions with Franklin Park                          
Nature of Business and Basis of Presentation                          
Capacity Of Plant | MW             2.8   2.8        
Variable interest entity ("VIE")                          
Nature of Business and Basis of Presentation                          
Cash and cash equivalents, unrestricted $ 4,797           $ 4,797   $ 4,797 $ 2,149   $ 4,797