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Accrued and Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accrued and Other Current Liabilities    
Accrued research and development $ 3,565 $ 3,623
Accrued legal and professional fees 265 1,118
Other current liabilities 842 860
Total $ 4,672 $ 5,601