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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 2,093 $ 3,017
Prepayments 893 902
Grant receivable 326 134
VAT receivable 607 309
Deposits $ 132 132
Other current assets 146
Prepaid expenses and other current assets $ 4,051 $ 4,640