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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Revenue Recognition |  |
Fair value digital asset | $ 45,037 | $ 15,811
Cumulative Effect, Period of Adoption, Adjustment | ASU 2023-08 - Crypto Assets |  |
Revenue Recognition |  |
Fair value digital asset |  | $ 6,200
Minimum |  |
Revenue Recognition |  |
Coal shipments, payment period | 14 days |
Maximum |  |
Revenue Recognition |  |
Coal shipments, payment period | 28 days |
Pension Plan |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Threshold for amortization of unrecognized actuarial gains and losses (as a percent) | 10.00% |

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