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CONVERTIBLE NOTES AND OTHER DEBTS - Convertible Roll Forwards Notes (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Jun. 02, 2020 | Sep. 13, 2019
Debt Instrument [Line Items] |  |  |  |
Notes carrying amount | $ 98,941 | $ 129,507 |  |
Convertible Note due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | 37,707 | 37,707 | $ 37,700 |
Less: Debt discount, net of amortization | (672) | (1,357) | $ (1,700) |
Less: Debt issuance costs, net of amortization | (211) | (425) |  |
Notes carrying amount | $ 36,824 | $ 35,925 |  |
Remaining amortization period (years) | 10 months 24 days | 1 year 10 months 24 days |  |
Effective interest rate on liability component | 6.95% | 6.95% |  |
Convertible Note due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | $ 115,500 | $ 115,500 |  | $ 115,500
Less: Debt discount, net of amortization | (14,576) | (19,294) |  |
Less: Debt issuance costs, net of amortization | (1,983) | (2,624) |  |
Notes carrying amount | $ 98,941 | $ 93,582 |  |
Remaining amortization period (years) | 2 years 8 months 12 days | 3 years 8 months 12 days |  |
Effective interest rate on liability component | 7.95% | 7.95% |  |
Senior Notes | Convertible Note due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | $ 37,700 |  |  |
Notes carrying amount | $ 36,800 |  |  |

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