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COMMITMENTS AND CONTINGENCIES - Prepayment Agreement (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other commitments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 58,680,000 | $ 38,404,000 | $ 34,395,000 | $ 34,752,000 | $ 28,240,000 | $ 25,988,000 | $ 30,647,000 | $ 25,542,000 | $ 166,231,000 | $ 110,417,000 | $ 136,541,000
Remaining net proceeds recorded as deferred revenue |  |  |  |  | 6,155,000 |  |  |  |  | 6,155,000 |
Auramet International LLC |  |  |  |  |  |  |  |  |  |  |
Other commitments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 136,911,000 | 50,580,000 |
Auramet International LLC | Prepayment Agreement | Guarantee Obligation |  |  |  |  |  |  |  |  |  |  |
Other commitments |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sales on a Supplier Advance Basis |  |  |  |  |  |  |  |  | 127,000,000.0 | 46,000,000.0 |
Revenue |  |  |  |  |  |  |  |  |  | 40,600,000 |
Remaining net proceeds recorded as deferred revenue |  |  |  |  | $ 6,200,000 |  |  |  |  | $ 6,200,000 |
Auramet International LLC | Prepayment Agreement | Guarantee Obligation | Precious metal |  |  |  |  |  |  |  |  |  |  |
Other commitments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 132,700,000 |  |
Number of ounces of gold |  |  |  |  | 3,500 |  |  |  |  | 3,500 |

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