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Accounts payable and other liabilities
 12 Months Ended
Dec. 31, 2022
Payables and Accruals [Abstract]  
Accounts payable and other liabilities Accounts payable and other liabilities
Accounts payable and other liabilities consist of the following (in thousands):
December 31,
20222021
Trade accounts payable$478 $526 
Accrued clinical and preclinical expenses4,360 2,399 
Accrued compensation and vacation3,539 3,263 
Other accrued liabilities1,170 1,227 
$9,547 $7,415