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COMMITMENTS AND CONTINGENCIES - Prepayment Agreement (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Commitments [Line Items]                      
Combined net proceeds from sales on a Supplier Advance Basis $ 2,500,000               $ 2,500,000    
Revenue 28,240,000 $ 25,988,000 $ 30,647,000 $ 25,542,000 $ 34,966,000 $ 37,129,000 $ 40,706,000 $ 23,740,000 110,417,000 $ 136,541,000 $ 104,789,000
Remaining net proceeds recorded as deferred revenue 6,155,000               6,155,000    
Gold and silver sales                      
Other Commitments [Line Items]                      
Revenue                 110,417,000 $ 136,541,000 $ 104,789,000
Prepayment Agreement | Auramet International LLC guarantee obligation                      
Other Commitments [Line Items]                      
Remaining net proceeds recorded as deferred revenue $ 6,200,000               $ 6,200,000    
Number of ounces of gold pledged but not delivered 3,500               3,500    
Prepayment Agreement | Auramet International LLC guarantee obligation | Auramet Revolving Facility [Member]                      
Other Commitments [Line Items]                      
Combined net proceeds from sales on a Supplier Advance Basis $ 46,000,000.0               $ 46,000,000.0    
Prepayment Agreement | Auramet International LLC guarantee obligation | Gold and silver sales                      
Other Commitments [Line Items]                      
Revenue                 $ 40,600,000