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Accrued Liabilities
 12 Months Ended
Dec. 31, 2023
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
Accrued liabilities consist of the following (in thousands):
As of December 31,
20222023
Accrued research and development expense
$3,192 $10,289 
Accrued payroll and related benefits
875 1,998 
Income taxes payable
347 — 
Operating lease liability, current portion
103 137 
Other accrued liabilities
227 379 
Total accrued liabilities
$4,744 $12,803