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ACCRUED LIABILITIES
 3 Months Ended
Mar. 31, 2022
Payables and Accruals [Abstract]  
ACCRUED LIABILITIES ACCRUED LIABILITIES
Accrued liabilities consisted of the following:
March 31,
2022		December 31,
2021
(in thousands)
Accrued outsourced clinical trials and preclinical studies$8,647 $6,316 
Accrued employee compensation and related taxes1,548 3,652 
Operating lease liability, short-term579 520 
Accrued legal fees and expenses272 80 
Accrued other professional service fees131 140 
Value of liability-classified stock purchase warrants100 100 
Other accrued liabilities283 210 
$11,560 $11,018