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Share-Based Compensation - Employee Share Purchase Plan (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2022
USD ($)
M
item
shares
Jan. 31, 2022
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2022
USD ($)
shares
Dec. 31, 2022
Share-Based Compensation          
Employee stock purchase plan offering period | M 24        
Employee stock purchase plan, purchase period | item 4        
Percentage of purchased share price 85.00%        
Percentage of employees contribution limited to employees annual gross earnings 15.00%        
Employee annual gross earnings not to exceed amount per year | $ $ 25,000        
Employee purchases in any offering period cannot exceed common shares | shares 15,000        
Percentage of employees purchases capped not to exceed total outstanding common shares 5.00%        
Employee Share Purchase Plan          
Share-Based Compensation          
Comprehensive loss | $     $ 39,000 $ 62,000  
Shares issued to employees | shares     0 42,426  
Employee Share Purchase Plan | Subsequent event          
Share-Based Compensation          
Percentage of common stock shares outstanding         1.00%
Employee Share Purchase Plan | General and administration expenses          
Share-Based Compensation          
Comprehensive loss | $     $ 27,000 $ 41,000  
Employee Share Purchase Plan | Exploration and evaluation activities          
Share-Based Compensation          
Comprehensive loss | $     $ 12,000 $ 21,000  
Employee Share Purchase Plan | Common Stock          
Share-Based Compensation          
Issuance of shares under PIPE financing - net proceeds (in shares) | shares 5,254,324        
Issuance of common shares added to ESPP | shares   2,254,324