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Accrued Expenses and Other Liabilities
 3 Months Ended
Mar. 31, 2022
Other Liabilities Disclosure [Abstract]  
Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities
Accrued expenses and other liabilities consisted of the following (in thousands):
March 31,December 31,
20222021
Accrued research and development expense$1,688 $3,043 
Accrued professional expenses1,761 1,386 
Accrued compensation and benefit costs2,158 5,018 
Payroll tax payable708 593 
Income taxes payable207 — 
Other liabilities958 268 
$7,480 $10,308