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ACCRUED LIABILITIES
 12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
ACCRUED LIABILITIES ACCRUED LIABILITIES

Accrued liabilities consisted of the following (in thousands):
 
December 31,
 
2019
 
2018
Accrued contracted research and development services
$
4,532

 
$
847

Accrued professional fees
1,788

 
1,269

Accrued compensation
59

 
569

Accrued note payable issuance costs
—

 
587

Total
$
6,379

 
$
3,272