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Accrued and Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued and Other Current Liabilities    
Accrued research and development $ 3,623 $ 3,471
Accrued legal and professional fees 1,118 232
Other current liabilities 860 480
Total $ 5,601 $ 4,183