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Deferred Gain on Sale of Royalty (Details) - USD ($)
$ in Thousands
12 Months Ended
May 29, 2020
Dec. 31, 2021
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]      
Proceeds from royalty obligation $ 30,000 $ 0 $ 30,000
Smelter royalty obligation, percentage 1.50%    
Smelter royalty obligation, right to repurchase percentage 33.30%    
Smelter royalty obligation, right to repurchase percentage, net of returns 0.50%    
Amortization of royalty obligation   100  
Payments for royalty obligations   2,300  
Deferred gain on sale of royalty   $ 125 $ 124