Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENTS - Prior Notes (Details)

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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
Debt Instrument, Face Amount   $ 100
Additional aggregate principal amount $ 10  
Applicable margin rate   7.00%
LIBOR    
Applicable margin rate   1.00%