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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 845 $ 1,730
Prepayments 365 867
VAT receivable 376 327
Other current assets 206 173
Prepaid expenses and other current assets $ 1,792 $ 3,097