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LONG-TERM DEBT AND COMMON STOCK WARRANT LIABILITY - Common Stock Warrant Liability Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 13, 2016 $ / shares shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Class of Warrant or Right [Line Items] |  |  |
Expected contractual term |  | 7 years 4 months 13 days | 3 years 10 months 2 days
Change in value of stock warrants |  | $ (1,671) | $ 1,379
Line of Credit | Second Lien Credit Agreement | Warrant to Purchase Common Equity |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants issued (in shares) | shares | 1,006,568 |  |
Warrants granted as a percent of outstanding common equity | 5.00% |  |
Warrant exercise price (in USD per share) | $ / shares | $ 1.67 |  |
Warrants, period for measuring warrant exercise price | 60 days |  |
Warrants, period for mandatory registration rights | 2 years |  |
Warrant, redemption rights, period for measuring repurchase value | 21 days |  |
Change in value of stock warrants |  | $ (1,700) | $ 1,400
Unsecured Debt | Second Lien Credit Agreement | Warrant to Purchase Common Equity |  |  |
Class of Warrant or Right [Line Items] |  |  |
Term | 4 years |  |
Interest rate | 13.25% |  |
Price volatility rate |  |  |
Class of Warrant or Right [Line Items] |  |  |
Input assumptions, expected rate |  | 0.4326 | 0.4755
Expected dividend rate |  |  |
Class of Warrant or Right [Line Items] |  |  |
Input assumptions, expected rate |  | 0 | 0
Risk free interest rate |  |  |
Class of Warrant or Right [Line Items] |  |  |
Input assumptions, expected rate |  | 0.0264 | 0.0213

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