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Debt - Narrative (Details)
$ / shares in Units, lb in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 22, 2025
USD ($)
Aug. 19, 2025
USD ($)
d
$ / shares
Dec. 05, 2023
lb
Feb. 29, 2024
shares
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jul. 02, 2025
USD ($)
Feb. 14, 2023
USD ($)
$ / shares
Notes payable                    
Debt Instrument [Line Items]                    
Interest rate (as a percent)     9.00%              
Interest expense         $ 211,000 $ 445,000 $ 797,000 $ 1,072,000    
Uranium loan | lb     200              
Term of loan agreement     12 months              
Total payoff amount $ 10,573,000                  
Consisting of principal 10,054,000                  
Accrued interest $ 519,000                  
Outstanding balance         0   0      
Convertible debt                    
Debt Instrument [Line Items]                    
Face amount                   $ 60,000,000
Interest rate (as a percent)                   8.00%
Conversion price (in USD per share) | $ / shares                   $ 2.91
Interest expense         728,000 $ 0 728,000 217,000    
Amortization of debt issuance costs         115,000   115,000      
Unamortized premium                   $ 3,813,000
Long-term debt         $ 115,000,000   $ 115,000,000     $ 56,187,000
Accretion expense               $ 65,000    
Shares issued during debt conversion | shares       6,872,143            
Convertible Senior Notes | Convertible debt                    
Debt Instrument [Line Items]                    
Face amount   $ 115,000,000                
Interest rate (as a percent)   5.50%                
Net proceeds from the offering of notes   $ 109,200,000                
Payment of capped call transactions   11,549,000                
Repayments of notes payable   $ 10,600,000                
Conversion ratio   0.3039976                
Conversion price (in USD per share) | $ / shares   $ 3.29                
Convertible Senior Notes | Convertible debt | Debt Conversion Terms One                    
Debt Instrument [Line Items]                    
Debt instrument, convertible, threshold percentage of stock price trigger   130.00%                
Debt instrument, convertible, threshold trading days | d   20                
Debt instrument, convertible, threshold consecutive trading days | d   30                
Cash Facility | Notes payable                    
Debt Instrument [Line Items]                    
Interest rate (as a percent)                 10.00%  
Provide for a cash facility                 $ 3,600,000  
Call Option | Convertible debt                    
Debt Instrument [Line Items]                    
Cap price (in USD per share) | $ / shares   $ 4.52