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Accrued Expenses - Schedule of Current Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Clinical trial expenses $ 2,497 $ 4,530
Compensation, excluding taxes 3,525 1,785
Professional fees 263 190
Short-term portion of lease restructuring   184
Other 662 1,275
Total accrued expenses $ 6,947 $ 7,964