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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Payroll and related costs $ 3,531 $ 4,097
Clinical trials and drug development 6,785 2,452
Professional fees 1,862 927
Short-term lease liabilities 529 510
Other 676 532
Total accrued expenses $ 13,383 $ 8,518