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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Legal and other professional services $ 4,121 $ 268
Compensation expense 3,862 1,371
Research and development projects 1,240 517
Offering costs 0 506
Payroll tax expense 163 328
Other current expense 399 74
Total $ 9,785 $ 3,064