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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 2,014 $ 1,744
Prepayments 821 427
Grant receivable 265 357
Sales tax receivable 552 209
Deposits 132 132
Other current assets 418 519
Prepaid expenses and other current assets $ 4,202 $ 3,388