v3.26.1
Borrowings - Narrative (Details)
3 Months Ended
Nov. 24, 2025
USD ($)
tradingDay
$ / shares
Jul. 29, 2025
Jun. 13, 2025
USD ($)
Jun. 03, 2025
USD ($)
tradingDay
$ / shares
Nov. 26, 2024
USD ($)
tranche
Jun. 21, 2024
USD ($)
Mar. 31, 2026
USD ($)
$ / shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
shares
Mar. 31, 2025
USD ($)
May 31, 2025
Apr. 16, 2025
USD ($)
Jan. 31, 2023
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
Jul. 06, 2021
USD ($)
Debt Instrument                              
Cash paid for interest             $ 5,000     $ 73,000          
Common stock, par value (in dollars per share) | $ / shares             $ 0.0001 $ 0.0001              
Long-term debt, current             $ 0 $ 372,000              
November 2025 Convertible Note | Convertible Notes                              
Debt Instrument                              
Principal amount       $ 122,868,000                      
Cash paid for interest       3,072,000                      
Repayments of long-term debt       131,000,000                      
Debt instrument, premium repayment contingency       5,000,000                      
Proceeds from repayment of debt premium     $ 5,000,000                        
Non-cash interest expense - related parties             0     3,942,000          
November 2025 Convertible Note | Convertible Notes | Related Party                              
Debt Instrument                              
Principal amount                             $ 100,000,000
AFG Convertible Notes [Member] | Convertible Notes                              
Debt Instrument                              
Interest rate during period   7.00%                          
Common stock, par value (in dollars per share) | $ / shares                         $ 0.0001    
Conversion price per unit (in dollars per share) | $ / shares                         $ 1.67    
AFG Convertible Notes [Member] | Convertible Notes | Common Stock                              
Debt Instrument                              
Conversion rate (as a percent)                 59.88024%            
Shares issued on conversion (in shares) | shares               2,863,291 16,578,810            
AFG Convertible Notes [Member] | Convertible Notes | Related Party                              
Debt Instrument                              
Principal amount                         $ 13,750,000    
Non-cash interest expense - related parties             $ 0     1,839,000          
AFG Convertible Notes [Member] | Convertible Notes | Related Party | Period One                              
Debt Instrument                              
Stated interest rate (as a percent)                         26.50%    
Delayed Draw Term Loan | Secured Debt                              
Debt Instrument                              
Principal amount           $ 210,500,000                  
Delayed Draw Term Loan | Secured Debt                              
Debt Instrument                              
Stated interest rate (as a percent)             7.00%                
Percentage of original issue discount           5.00%                  
Percentage of additional debt instrument, interest rate             5.00%                
Delayed Draw Term Loan | Senior Notes                              
Debt Instrument                              
Proceeds from issuance of senior long-term debt           $ 198,800,000                  
Delayed Draw Term Loan | Line of Credit | Revolving Credit Facility                              
Debt Instrument                              
Maximum borrowing capacity           105,000,000                  
Delayed Draw Term Loan (DDTL) | Secured Debt                              
Debt Instrument                              
Debt instrument, writ or warrant excess amount           $ 2,500,000                  
Equipment financing facility                              
Debt Instrument                              
Long-term line of credit             $ 0 $ 372,000              
Long-term debt, current             0 372,000              
Non-cash interest expense - related parties             52,000     82,000          
Equipment financing facility | Line of Credit                              
Debt Instrument                              
Maximum borrowing capacity                           $ 25,000,000  
May 2025 Convertible Notes | Convertible Notes                              
Debt Instrument                              
Principal amount       $ 225,000,000                      
Stated interest rate (as a percent)                     6.75%        
Conversion price per unit (in dollars per share) | $ / shares       $ 5.10                      
Non-cash interest expense - related parties             924,000                
Debt instrument, option payment amounts       $ 25,000,000                      
Threshold percentage of stock price trigger       130.00%                      
Threshold consecutive trading days | tradingDay       20                      
Trading days | tradingDay       30                      
Sale price of common stock period       10 days                      
Sale price of common stock       98.00%                      
Excess stock price threshold       130.00%                      
Aggregate principal amount       $ 75,000,000                      
Interest payable             984,000 141,000              
November 2025 Convertible Notes | Convertible Notes                              
Debt Instrument                              
Principal amount $ 525,000,000                            
Stated interest rate (as a percent) 1.75%                            
Conversion price per unit (in dollars per share) | $ / shares $ 16.29                            
Non-cash interest expense - related parties             10,679,000                
Debt instrument, option payment amounts $ 75,000                            
Threshold consecutive trading days | tradingDay 20                            
Trading days | tradingDay 30                            
Excess stock price threshold 130.00%                            
Aggregate principal amount $ 75,000,000                            
Interest payable             3,675,000 $ 1,050,000              
DOE Loan Facility | DOE Loan Facility Tranche 1                              
Debt Instrument                              
Maximum borrowing capacity                       $ 90,945,000      
DOE Loan Facility | DOE Loan Facility Tranche 2                              
Debt Instrument                              
Maximum borrowing capacity                       106,733,000      
DOE Loan Facility | DOE Loan Facility Tranche 3                              
Debt Instrument                              
Maximum borrowing capacity                       67,529,000      
DOE Loan Facility | DOE Loan Facility Tranche 4                              
Debt Instrument                              
Maximum borrowing capacity                       $ 12,290,000      
DOE Loan Facility | Line of Credit                              
Debt Instrument                              
Maximum borrowing capacity         $ 277,497,000                    
Non-cash interest expense - related parties             $ 1,614,000     $ 899,000          
Line of credit facility, maximum capitalized interest         $ 25,953,000                    
Eligible project costs, percentage         80.00%                    
Funding cost of debt, percentage         20.00%                    
Debt instrument, variable interest rate, type flag         US Treasury (UST) Interest Rate [Member]                    
Variable rate spread         0.375%                    
DOE Loan Facility | Line of Credit | Minimum                              
Debt Instrument                              
Debt instrument, number of tranches | tranche         2                    
DOE Loan Facility | Line of Credit | Maximum                              
Debt Instrument                              
Debt instrument, number of tranches | tranche         4