v3.26.1
Common Shares - Schedule of common shares (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 14, 2023
Feb. 21, 2023
Dec. 31, 2025
Dec. 31, 2024
Common Shares        
Number of beginning balance     340,708,460  
Balance     $ (17,118) $ 10,918
Amount of issuance of shares to Korea Zinc     85,118  
Amount of issuance of shares under Registered Direct Offering       23,213
Shares issued from At-the-Market Equity Distribution Agreement (in shares) 4,150,000      
Conversion of restricted share units (in shares)   5,000,000    
Exercise of stock options     3,013 463
Share purchase under Employee Share Purchase Plan     $ 67 $ 39
Number of ending balance     422,966,333 340,708,460
Balance     $ (33,443) $ (17,118)
Class A Warrants        
Common Shares        
Exercise of warrants     3,827  
Class B Warrants        
Common Shares        
Exercise of warrants     9,800  
Class C Warrants        
Common Shares        
Exercise of warrants     10,485  
2024 Registered Direct Offering        
Common Shares        
Amount of issuance of shares under Registered Direct Offering     $ 5,000  
2025 Registered Direct Offering        
Common Shares        
Number of issuance of shares under Registered Direct Offering (in shares)     12,333,333  
Amount of issuance of shares under Registered Direct Offering     $ 36,697  
At-the-Market Equity Offering        
Common Shares        
Shares issued from At-the-Market Equity Distribution Agreement (in shares)     7,542,996 3,251,588
Shares issued as per At-the Market Equity Distribution Agreement     $ 14,784 $ 4,866
Common Stock        
Common Shares        
Number of beginning balance     340,708,460 306,558,710
Balance     $ 477,217 $ 438,239
Issuance of shares to Korea Zinc (in shares)     19,623,376  
Amount of issuance of shares to Korea Zinc     $ 71,686  
Number of issuance of shares under Registered Direct Offering (in shares)       19,400,000
Amount of issuance of shares under Registered Direct Offering       $ 17,190
Conversion of restricted share units (in shares)     20,296,128 10,734,581
Conversion of restricted share units     $ 41,355 $ 14,954
Exercise of stock options (in shares)     4,746,546 715,772
Exercise of stock options     $ 14,423 $ 1,891
Share purchase under Employee Share Purchase Plan (in shares)     39,128 47,809
Share purchase under Employee Share Purchase Plan     $ 91 $ 77
Number of ending balance     422,966,333 340,708,460
Balance     $ 681,343 $ 477,217
Common Stock | Class A Warrants        
Common Shares        
Exercise of warrants (in shares)     1,913,270  
Exercise of warrants     $ 5,539  
Common Stock | Class B Warrants        
Common Shares        
Exercise of warrants (in shares)     8,433,096  
Exercise of warrants     $ 17,024  
Common Stock | Class C Warrants        
Common Shares        
Exercise of warrants (in shares)     2,330,000  
Exercise of warrants     $ 12,838  
Common Stock | 2023 Registered Direct Offering        
Common Shares        
Number of issuance of shares under Registered Direct Offering (in shares)       4,500,000
Amount of issuance of shares under Registered Direct Offering       $ 7,447
Common Stock | 2024 Registered Direct Offering        
Common Shares        
Number of issuance of shares under Registered Direct Offering (in shares)     5,000,000 14,900,000
Amount of issuance of shares under Registered Direct Offering     $ 2,237 $ 9,743
Common Stock | 2025 Registered Direct Offering        
Common Shares        
Number of issuance of shares under Registered Direct Offering (in shares)     12,333,333  
Amount of issuance of shares under Registered Direct Offering     $ 24,149  
Common Stock | At-the-Market Equity Offering        
Common Shares        
Shares issued from At-the-Market Equity Distribution Agreement (in shares)     7,542,996 3,251,588
Shares issued as per At-the Market Equity Distribution Agreement     $ 14,784 $ 4,866