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LOANS PAYABLE - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
LOAN PAYABLE    
Loan payable $ 70,000 $ 70,000
Add: Accreted Liability of final payment fee 5,402 5,140
Loan payable, gross 75,402 75,140
Less: unamortized debt issuance costs (6,455) (7,377)
Loan payable 68,947 67,763
Total loan payable 68,947 67,763
Less: Current portion   (975)
Loan payable non-current $ 68,947 $ 66,788