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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Professional fees $ 540 $ 1,744
Compensation and related benefits 675 566
Clinical trial costs 858 51
Value-added tax 0 426
Rebates and returns of former commercial products 138 223
Other 8 191
Accrued expenses and other current liabilities $ 2,219 $ 3,201