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LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENT - Senior Secured Notes Narrative (Details) - USD ($) $ in Millions | Feb. 12, 2021 | Feb. 02, 2021 | Dec. 31, 2020 | Feb. 02, 2018
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Senior Secured Notes Due 2024 | Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of prepayment Premium |  | 0.90% |  |
Senior Secured Notes Due 2024 | Senior Secured Notes | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of prepayment Premium |  | 0.90% |  |
Senior Secured Notes Due 2024 | Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of borrowings |  |  |  | $ 100.0
Percentage of prepayment Premium |  |  | 1.90% |
Senior Secured Notes Due 2028 | Senior Secured Notes | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of borrowings | $ 310.0 |  |  |
Interest rate | 8.25% |  |  |
Borrowed funds designated for contructing project | $ 180.0 |  |  |
Proceeds form the offering | $ 8.0 |  |  |
Redemption percentage | 35.00% |  |  |
Percentage of redemption of equity offering | 108.25% |  |  |
Percentage of redemption on accrued and unpaid interest | 100.00% |  |  |

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