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Accrued Expenses and Other Liabilities
 12 Months Ended
Dec. 31, 2021
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):
December 31,
20212020
Accrued research and development expense$3,043 $720 
Accrued professional expenses1,386 701 
Accrued compensation and benefit costs5,018 1,687 
Payroll tax payable593 384 
Income taxes payable— 243 
Other liabilities268 413 
$10,308 $4,148