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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Expenses    
Compensation and related benefits $ 4,435 $ 2,568
Professional fees 214 183
Contract research fees 563 43
Other 183 214
Total accrued expenses $ 5,395 $ 3,008