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Accrued and Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Accrued and Other Current Liabilities      
Accrued research and development $ 3,335 $ 3,471 $ 2,793
Other current liabilities 792 712 961
Total $ 4,127 $ 4,183 $ 3,754