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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 1,374 $ 1,744
Prepayments 1,015 427
Grant receivable 202 357
Sales tax receivable 378 209
Deposits 128 132
Other current assets 325 519
Prepaid expenses and other current assets $ 3,422 $ 3,388