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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Compensation $ 613 $ 569
Professional fees 83 506
Clinical trial expenses 7 310
Other expenses 302 581
Accrued expenses $ 1,005 $ 1,966