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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
PREPAID EXPENSES AND OTHER CURRENT ASSETS    
Research and development tax credit receivable $ 1,215 $ 1,033
Prepayments 245 358
Grant receivable 203  
Sales tax receivable 233 45
Deposits 153 153
Other current assets 7 10
Total prepaid expenses and other current assets $ 2,056 $ 1,599