Quarterly report pursuant to Section 13 or 15(d)

ACCRUED LIABILITIES - Summary of Accrued Liabilities (Details)

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ACCRUED LIABILITIES - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accrued contracted research and development services $ 2,922 $ 3,733
Accrued compensation 978 1,369
Accrued professional fees 220 318
Total $ 4,120 $ 5,420