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DEBT - Schedule of Future Minimum Payments Under Term Loan Agreement (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Disclosure [Abstract] |  |
Remainder of 2021 | $ 796 |
2022 | 5,858 |
2023 | 19,187 |
2024 | 18,338 |
Total | 44,179 |
Less: amount representing interest | (6,887) |
Less: unamortized debt discount and issuance costs | (836) |
Less: unaccrued end of term charge | (1,787) |
Noncurrent portion of debt | $ 34,669 | $ 24,042

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