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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
CRO and clinical trial costs $ 11,800 $ 5,263
Manufacturing activities 1,903 1,740
Professional legal and accounting fees 640 318
Interest payable 194  
Other 388 207
Accrued liabilities $ 14,925 $ 7,528