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Accounts payable and accrued liabilities
 3 Months Ended
Mar. 31, 2024
Payables and Accruals [Abstract]  
Accounts payable and accrued liabilities Accounts payable and accrued liabilities
Accounts payable and accrued liabilities are comprised of the following:
 March 31, 2024December 31, 2023
(in thousands)
Trade accounts payable$3,743 $3,223 
Research and development accruals1,940 2,884 
Professional fee accruals1,173 815 
Payroll accruals1,391 3,349 
Total accounts payable and accrued liabilities$8,247 $10,271