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Accrued Expenses
 9 Months Ended
Sep. 30, 2021
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consisted of the following:
(in thousands)September 30,
2021		December 31,
2020
Compensation expense$2,356 $1,371 
Legal and other professional services3,434 268 
Research and development projects539 517 
Offering costs— 506 
Payroll tax expense328 328 
Other current expense76 74 
Total$6,733 $3,064