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Agreement with SK hynix (Details 4) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Sep. 30, 2013
Jun. 11, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash Received to date in 2013 $ 12.0  
Estimated to Be Received in Remainder of 2013 12.0  
Estimated to Be Received in 2014 48.0  
Estimated to Be Received in 2015 48.0  
Estimated to Be Received in 2016 48.0  
Estimated to Be Received in 2017 48.0  
Estimated to Be Received in 2018 24.0  
Total Estimated Cash receipts 240.0 240.0
Royalty revenue
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash Received to date in 2013 11.8  
Estimated to Be Received in Remainder of 2013 11.8  
Estimated to Be Received in 2014 47.3  
Estimated to Be Received in 2015 47.3  
Estimated to Be Received in 2016 47.9  
Estimated to Be Received in 2017 48.0  
Estimated to Be Received in 2018 24.0  
Total Estimated Cash receipts 238.1 238.1
Gain from settlement
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash Received to date in 2013 0.2  
Estimated to Be Received in Remainder of 2013 0.2  
Estimated to Be Received in 2014 0.7  
Estimated to Be Received in 2015 0.7  
Estimated to Be Received in 2016 0.1  
Estimated to Be Received in 2017 0  
Estimated to Be Received in 2018 0  
Total Estimated Cash receipts $ 1.9