DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands |
Dec. 31, 2019 |
Dec. 31, 2018 |
Oct. 16, 2018 |
|---|---|---|---|
| Debt Instrument [Line Items] | |||
| Less: current portion | $ (12,025) | $ (35,314) | |
| Loans Payable | |||
| Debt Instrument [Line Items] | |||
| Original principal amount | 12,025 | 35,500 | |
| Unamortized original issue discount | 0 | (1,418) | |
| Unamortized debt issuance cost | 0 | (18) | |
| Carrying value of Loan | 12,025 | 34,064 | |
| Exit fee payable in relation to Loan | 0 | 1,250 | $ 1,000 |
| Total long-term debt | 12,025 | 35,314 | |
| Less: current portion | (12,025) | (35,314) | |
| Long-term debt, less current portion and net of debt issuance cost | $ 0 | $ 0 |