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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accrued clinical trial costs $ 13,285 $ 14,034
Accrued compensation 11,223 13,546
Accrued professional fees 3,936 3,706
Lease liabilities, current 2,825 0
Other accrued expenses 5,861 5,249
Total $ 37,130 $ 36,535