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Reclamation and Remediation (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis    
Reclamation liabilities - balance at beginning of period $ 1,833 $ 1,890
Foreign currency exchange loss (gain) 25 (57)
Reclamation liabilities - balance at end of period 1,858 1,833
Asset retirement obligation - balance at beginning of period 1,279 1,208
Accretion 77 109
Foreign currency exchange loss (gain) 18 (38)
Asset retirement obligation - balance at end of period 1,374 1,279
Total period end balance $ 3,232 $ 3,112