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Accrued Expenses - Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Compensation and related costs $ 1,032 $ 1,261
Clinical and development 1,692  
Construction in process 441  
Consulting - former Chief Scientific Officer   190
Professional fees 19 56
Other 9 10
Total accrued expenses $ 3,193 $ 1,517