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LONG-TERM DEBT AND COMMON STOCK WARRANT LIABILITY - Common Stock Warrant Liability (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 13, 2016 $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Class of Warrant or Right [Line Items] |  |  |  |
Expected contractual term |  | 6 years 4 months 13 days |  | 7 years 4 months 13 days
Fair Value Adjustment of Warrants |  | $ 1,230 | $ (1,671) |
Price volatility rate |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Expected stock rate |  | 0.4687 |  | 0.4326
Expected dividend rate |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Expected stock rate |  | 0 |  | 0
Risk free interest rate |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Expected stock rate |  | 0.0179 |  | 0.0264
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 |  |  |
Warrant exercise price (in dollars per share) | $ / shares | $ 1.67 |  |  |
Warrants, period for measuring warrant exercise price | 60 days |  |  |
Warrants, period for mandatory registration rights | 2 years |  |  |
Period for measuring repurchase value | 21 days |  |  |
Fair Value Adjustment of Warrants |  |  | $ (1,200) | $ 1,700
Unsecured Debt | Second Lien Credit Agreement | Warrant to Purchase Common Equity |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Term of unsecured note | 4 years |  |  |
Interest rate on unsecured note | 13.25% |  |  |

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