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COMMITMENTS AND CONTINGENCIES - Prepayment agreement (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Commitments |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 33,523,000 | $ 52,250,000 | $ 47,476,000 | $ 41,228,000 | $ 58,680,000 | $ 38,404,000 | $ 34,395,000 | $ 34,752,000 | $ 174,477,000 | $ 166,231,000 | $ 110,417,000
Auramet International LLC ("Auramet") |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 56,869,000 | 136,911,000 | $ 50,580,000
Auramet International LLC ("Auramet") | Prepayment Agreement | Guarantee Obligation |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sales on a Supplier Advance Basis |  |  |  |  |  |  |  |  |  | 8,400,000 | 127,000,000 |
Revenue |  |  |  |  |  |  |  |  |  |  | $ 132,700,000 |
Auramet International LLC ("Auramet") | Prepayment Agreement | Guarantee Obligation | Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |  |  |  |  |  |
Duration of the extension of precious metals purchase agreement (in years) | 1 year |  |  |  |  |  |  |  |  |  |  |
Auramet International LLC ("Auramet") | Prepayment Agreement | Guarantee Obligation | Precious metal |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |  |  |  |  |  |
Revenue from sales on a Supplier Advance Basis |  |  |  |  |  |  |  |  |  | 4,900,000 |  |
Remaining net proceeds recorded as deferred revenue |  | $ 3,500,000 |  |  |  |  |  |  |  | $ 3,500,000 |  |
Number of ounces of gold |  | 1,335 |  |  |  |  |  |  |  | 1,335 |  |

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