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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 2,503 $ 2,093
Prepayments 826 893
Grant receivable 35 326
VAT receivable 624 607
Deposits 132 132
Prepaid expenses and other current assets $ 4,120 $ 4,051