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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 |  |

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