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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Payables and Accruals [Abstract]    
CRO and clinical trial costs $ 22,567 $ 22,804
Manufacturing activities 6,846 4,123
Professional legal and accounting fees 5,435 2,030
Interest payable 393 336
Other 555 541
Accrued liabilities $ 35,796 $ 29,834