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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 1,730 $ 2,093
Prepayments 867 893
Grant receivable 326
VAT receivable 327 607
Deposits 132 132
Other current assets 41 75
Prepaid expenses and other current assets $ 3,097 $ 4,126