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LOANS PAYABLE - Summary (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
LOAN PAYABLE |  |
Loan payable | $ 30,000 | $ 30,000
End of term fee | 975 | 975
Loan payable, gross | 30,975 | 30,975
Less: unamortized debt issuance costs | (386) | (1,080)
Loan payable | 30,589 | 29,895
Less: principal payments | (14,590) |
Total loan payable | 15,999 | 29,895
Less: Current portion | $ (15,999) | (22,179)
Loan payable non-current |  | $ 7,716

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