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LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENTS - Senior Secured Notes Narrative (Details) - USD ($) $ in Millions | Feb. 07, 2022 | Feb. 12, 2021 | Jan. 31, 2022 | Dec. 31, 2021 | Feb. 02, 2018
--- | --- | --- | --- | --- | ---
Senior Secured Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Percentage of prepayment Premium |  | 0.90% |  |  |
Cripple Creek Project |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Restricted cash account |  | $ 180.0 |  |  |
Restricted cash reserved |  |  |  | $ 176.6 |
Cripple Creek Project | Subsequent Event |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Restricted cash reserved |  |  | $ 221.0 |  |
Senior Secured Notes Due 2028 | Senior Secured Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Aggregate principal amount |  | $ 310.0 |  |  |
Interest rate |  | 8.25% |  |  |
Borrowed funds designated for constructing project |  | $ 180.0 |  |  |
Proceeds from the offering |  | $ 8.0 |  |  |
Senior Secured Notes Due 2028 | Senior Secured Notes | Subsequent Event |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Additional principal amount of debt issued | $ 100.0 |  |  |  |
Issue price, percentage | 102.00% |  |  |  |
Interest rate | 8.25% |  |  |  |
Senior Secured Notes Due 2024 | Senior Secured Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 100.0

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