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Accrued Expenses and Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accrued expenses and other current liabilities    
Salary and related expenses $ 6,791 $ 8,997
Research and clinical trial costs 7,087 2,383
Accrued interest 2,461 8,262
Construction in progress 2,100  
Warrant liability 4,922  
Accrued litigation settlement liability 24,547  
Other 1,716 1,094
Accrued expenses and other current liabilities $ 49,624 $ 20,736