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Accounts payable and other liabilities
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Accounts payable and other liabilities Accounts payable and other liabilities
Accrued liabilities consist of the following (in thousands):
December 31,
20202019
Trade accounts payable$1,323 $1,604 
Accrued clinical and preclinical expenses1,687 944 
Accrued compensation and vacation3,244 1,238 
Other accrued liabilities927 339 
$7,181 $4,125