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ACCRUED LIABILITIES
6 Months Ended
Jun. 30, 2020
Payables and Accruals [Abstract]  
ACCRUED LIABILITIES ACCRUED LIABILITIES
Accrued liabilities consisted of the following:
June 30,
2020
December 31,
2019
(in thousands)
Accrued outsourced clinical trials and preclinical studies$959  $2,259  
Accrued employee compensation and related taxes686  508  
Operating lease liability397  —  
Restructuring liability377  1,515  
Accrued legal fees and expenses311  284  
Accrued other professional service fees105  254  
Value of liability-classified stock purchase warrants 100  100  
Deferred and accrued facility lease obligations—  66  
Other accrued liabilities85  122  
Total accrued liabilities$3,020  $5,108