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Prepaid Expenses and Other Current Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Prepaid Expenses and Other Current Assets [Abstarct]    
Research and development tax credit receivable $ 1,744 $ 1,033
Prepayments 427 358
Grant receivable 357  
Sales tax receivable 209 45
Deposits 132 153
Other current assets 519 10
Total prepaid expenses and other current assets $ 3,388 $ 1,599