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LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENTS - Prior Notes (Details) - Senior Secured Notes Due 2024 - Senior Secured Notes - USD ($) $ in Millions | May 10, 2019 | Feb. 02, 2018
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Debt Instrument, Face Amount |  | $ 100
Additional aggregate principal amount | $ 10 |
Applicable margin rate |  | 7.00%
LIBOR |  |
Applicable margin rate |  | 1.00%

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