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Commitments and Contingencies (Details) (License Agreement litigation, Pending litigation, USD $)
In Millions, unless otherwise specified
1 Months Ended
Sep. 30, 2011
Dec. 31, 2012
May 31, 2012
Loss Contingencies [Line Items]      
Percentage of net profits from sales after net profit threshold   50.00%  
Net profit threshold   $ 40  
Equitable payment stream following first commercial sale, duration 10 years    
Percentage of litigation costs awarded 33.00%    
Plaintiff attorneys' fee and expenses     2.4
Accrued liabilities
     
Loss Contingencies [Line Items]      
Accrued liabilities, current   2.5  
Surety bond | Other assets
     
Loss Contingencies [Line Items]      
Payment to post collateral for surety bond   $ 1.3