v3.26.3
OTHER LIABILITIES - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 16, 2026
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Other Liabilities [Line Items]            
Finance fee expense   $ 0 $ 0 $ 6,368 $ 0  
Warrants expired (in shares)   3.8   3.8    
Current portion of liability   $ 0   $ 0   $ 400
Share-based payment liability   $ 0   $ 0   6,959
Weighted average remaining lease term   4 years   4 years    
Weighted average discount rate (as a percent)   8.48%   8.48%    
To be paid, year one   $ 1,000   $ 1,000    
To be paid, year two   6,000   6,000    
To be paid, year three   6,000   6,000    
To be paid, year four   6,000   6,000    
To be paid, year five   6,000   6,000    
To be paid, thereafter   1,200   1,200    
NSR Royalty            
Other Liabilities [Line Items]            
Principal amount $ 250,000          
Amount received 225,000          
Amount allocated to advancement of technical and permitting work 25,000          
Additional amount following initial disbursement $ 25,000          
Metal production to be issued (as percent) 1.50%          
Financial liability fair value option elected       3,800   0
Finance fee expense       6,400    
Company repaid amount   400   1,100    
NSR Royalty | Maximum            
Other Liabilities [Line Items]            
Metal production to be issued (as percent) 3.00%          
Sliver Purchase Agreement | Convertible loans            
Other Liabilities [Line Items]            
Total other liabilities   $ 0   $ 0   $ 2,700