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ACCRUED LIABILITIES
6 Months Ended
Jun. 30, 2022
Payables and Accruals [Abstract]  
ACCRUED LIABILITIES ACCRUED LIABILITIES
Accrued liabilities consisted of the following:
June 30,
2022
December 31,
2021
(in thousands)
Accrued outsourced clinical trials and preclinical studies$13,197 $6,316 
Accrued employee compensation and related taxes2,577 3,652 
Operating lease liability, short-term580 520 
Accrued legal fees and expenses79 80 
Accrued other professional service fees385 140 
Value of liability-classified stock purchase warrants100 100 
Other accrued liabilities121 210 
$17,039 $11,018