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DEBT - Schedule of Future Minimum Payments Under Term Loan Agreement (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Remainder of 2021	$ 1,566
2022	5,858
2023	19,187
2024	18,338
Total	44,949
Less: amount representing interest	(7,657)
Less: unamortized debt discount and issuance costs	(917)
Less: unamortized end of term charge	(1,959)
Noncurrent portion of debt	$ 34,416	$ 24,042

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