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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued Expenses    
Payroll and related costs $ 5,830 $ 4,097
Clinical trials and drug development 8,217 2,452
Professional fees 1,311 927
Short-term lease liabilities 556 510
Other 293 532
Total accrued expenses $ 16,207 $ 8,518