v3.26.3
COMMON SHARES - Schedule of Issued Share Capital (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 26, 2026
USD ($)
oz
shares
May 16, 2025
USD ($)
$ / shares
shares
Feb. 28, 2025
USD ($)
shares
Feb. 28, 2025
CAD ($)
$ / shares
shares
Jan. 31, 2025
USD ($)
shares
Jan. 31, 2025
CAD ($)
$ / shares
shares
Sep. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2026
USD ($)
shares
Mar. 31, 2026
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Sep. 30, 2026
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
shares
Dec. 31, 2025
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Beginning balance (in shares) | shares                 827,230,192       827,230,192    
Beginning balance             $ 258,047 $ 298,896 $ 346,773 $ 463,540 $ 317,958 $ 340,664 $ 346,773 $ 340,664  
Share-based compensation             2,576 932 2,669 283 332 58      
Issued on exercise of warrants (in shares) | shares                         541,341    
Exercise of warrants             $ 754 5,950 9,524 1,261          
Ending balance (in shares) | shares             867,527,720           867,527,720    
Ending balance             $ 224,591 258,047 298,896 422,999 463,540 317,958 $ 224,591 $ 422,999  
Issued from financing activities             $ (15) $ 4,796 $ 18,531 $ (218) $ 175,465 $ 18,441      
2023 Convertible Debentures | Convertible loans                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Shares issued (in shares) | shares                 8,100,000            
Convertible shares value                 $ 13,400            
Orion Convertible Loan | Convertible loans                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Shares issued (in shares) | shares                         3,000,000.0    
Convertible shares value                         $ 5,300    
Net proceeds from warrants issued                         $ 5,200    
Common Stock Warrants                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Issued on exercise of warrants (in shares) | shares             1,100,000           23,200,000    
Total gross proceeds             $ 700           $ 16,200    
Exercise price of warrants or rights (per share) | $ / shares             $ 0.70           $ 0.70    
Class of warrant or right, outstanding (in shares) | shares             150,800,000           150,800,000   174,000,000.0
Common Stock                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Beginning balance (in shares) | shares             865,901,683 853,481,397 827,230,192 814,697,291 443,358,811 409,786,957 827,230,192 409,786,957  
Beginning balance             $ 843,207 $ 831,239 $ 799,855 $ 790,183 $ 624,998 $ 606,505 $ 799,855 $ 606,505  
Offtake termination (in shares) | shares                         3,453,237    
Offtake termination                         $ 4,781    
Share-based compensation (in shares) | shares             549,937 467,049 1,520,468 76,181 338,480 20,000 2,537,454 434,661  
Share-based compensation             $ 954 $ 740 $ 2,558 $ 60 $ 237 $ 52 $ 4,253 $ 351  
Issued on exercise of warrants (in shares) | shares             1,076,100 8,500,000 13,603,447 1,801,000     23,179,547 1,801,000  
Exercise of warrants             $ 815 $ 6,432 $ 10,295 $ 1,363     $ 17,541 $ 1,363  
Ending balance (in shares) | shares             867,527,720 865,901,683 853,481,397 816,574,472 814,697,291 443,358,811 867,527,720 816,574,472  
Ending balance             $ 844,961 $ 843,207 $ 831,239 $ 791,388 $ 790,183 $ 624,998 $ 844,961 $ 791,388  
Issued from financing activities             (15) 4,796 18,531 (218) 164,948 18,441      
Additional Paid-In Capital                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Beginning balance             29,633 29,923 30,583 29,595 18,983 18,977 30,583 18,977  
Share-based compensation             1,622 192 111 223 95 6      
Exercise of warrants             (61) (482) (771) (102)          
Ending balance             42,773 $ 29,633 $ 29,923 $ 29,716 29,595 $ 18,983 42,773 $ 29,716  
Issued from financing activities   $ 10,500                 $ 10,517        
Additional Paid-In Capital | Common Stock Warrants                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Total gross proceeds             $ 100           $ 1,300    
2023 Convertible Debenture Redemption | Common Stock                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Shares issued in private placement (in shares) | shares                         8,133,983    
Private placement                         $ 13,354    
Orion Convertible Loan Repayment | Common Stock                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Shares issued in private placement (in shares) | shares                         2,993,307    
Private placement                         $ 5,177    
Private placement                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Common shares issued (in shares) | shares     1,000,000.0 1,000,000.0 28,200,000 28,200,000                  
Total gross proceeds     $ 600 $ 0.8 $ 15,600 $ 22.6                  
Public offering (in dollars per shares) | $ / shares       $ 0.80   $ 0.80                  
Private placement | Common Stock                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Shares issued in private placement (in shares) | shares                           25,240,000  
Private placement                           $ 11,788  
Brokered Placement | Common Stock                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Shares issued in private placement (in shares) | shares                           345,760,000  
Private placement                           $ 152,941  
Private Placement 2                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Net proceeds from warrants issued   $ 162,500                          
Common shares issued (in shares) | shares   345,800,000                          
Total gross proceeds   $ 172,900                          
Public offering (in dollars per shares) | $ / shares   $ 0.50                          
Allocated to share capital based relative fair values   $ 164,900                          
Private Placement 2 | Certain Directors And Officers                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Net proceeds from warrants issued   $ 12,500                          
Common shares issued (in shares) | shares   25,200,000                          
Total gross proceeds   $ 12,600                          
Public offering (in dollars per shares) | $ / shares   $ 0.50                          
Number of share issued (in shares) | shares   1                          
Exercise price of warrants or rights (per share) | $ / shares   $ 0.70                          
Warrants issued (in shares) | shares   185,500,000                          
Private Placement 2 | Common Stock                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Shares issued in private placement (in shares) | shares                           29,210,464  
Private placement                           $ 16,014  
ATM Program                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Common shares issued (in shares) | shares                       4,300,000      
Total gross proceeds                       $ 2,500      
ATM Program | Common Stock                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Shares issued in private placement (in shares) | shares                           4,341,390  
Private placement                           $ 2,426  
Offtake Termination                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Delivered per arrangement | oz 40,000                            
Common shares issued (in shares) | shares 3,500,000                            
Total gross proceeds $ 4,800