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Accrued Expenses and Other Liabilities (Tables)
9 Months Ended
Sep. 30, 2021
Other Liabilities Disclosure [Abstract]  
Schedule of Accrued Expenses and Other Liabilities
Accrued expenses and other liabilities consisted of the following (in thousands):
September 30,December 31,
20212020
Accrued research and development expense$2,233 $720 
Accrued professional expenses768 701 
Accrued compensation and benefit costs2,026 1,687 
Payroll tax payable530 384 
Income taxes payable581 243 
Other liabilities443 413 
$6,581 $4,148