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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 1,693 $ 1,054
Prepayments and VAT receivable 998 772
Other current assets 172 238
Prepaid expenses and other current assets $ 2,863 $ 2,064