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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
CRO and clinical trial costs $ 22,804 $ 11,800
Manufacturing activities 4,123 1,903
Professional legal and accounting fees 2,030 640
Interest payable 336 194
Other 541 388
Accrued liabilities $ 29,834 $ 14,925