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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Prepaid Expenses And Other Current Assets [Abstract]    
Research and development tax credit receivable $ 2,329 $ 1,744
Prepayments 1,077 427
Grant receivable 247 357
Sales tax receivable 440 209
Deposits 142 132
Other current assets 483 519
Total prepaid expenses and other current assets $ 4,718 $ 3,388