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LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENT - Prior Notes and Waivers (Details) - Senior Secured Notes Due 2024 - USD ($) $ in Millions | May 10, 2019 | Feb. 02, 2018 | Feb. 02, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of prepayment Premium |  |  | 0.90% |
Senior Secured Notes | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of prepayment Premium |  |  | 0.90% |
Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of borrowings |  | $ 100 |  |
Additional aggregate principal amount | $ 10 |  |  |
Applicable margin rate |  | 7.00% |  |
Percentage of prepayment Premium |  |  |  | 1.90%
Senior Secured Notes | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin rate |  | 1.00% |  |

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