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Accrued Expenses - Schedule of Composition of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued clinical and related costs $ 765 $ 1,358
Accrued compensation and related costs 960 914
Accrued interest 54 194
Operating lease liability, short-term 239  
Accrued other 295 305
Accrued expenses and other current liabilities $ 2,313 $ 2,771