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Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Professional fees	$ 2,836	$ 1,744
Compensation and related benefits	808	566
Clinical trial costs	583	51
Value-added tax	158	426
Rebates and returns of former commercial products	22	223
Other	276	191
Accrued expenses and other current liabilities	4,683	3,201
Legal fees	0	$ 1,300
JBG Litigation
Liability for Claims and Claims Adjustment Expense [Line Items]
Legal fees	$ 2,500

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