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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 1,222 $ 3,017
Prepayments 1,091 902
Grant receivable 209 134
Sales tax receivable 694 309
Deposits 132 132
Other current assets 105 146
Prepaid expenses and other current assets $ 3,453 $ 4,640