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Agreement with SK hynix (Details 4) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Dec. 09, 2013
Jun. 11, 2013
Micron Agreement [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cash Received $ 40.0 $ 40.0 $ 5.5      
Estimated to Be Received in 2016 40.0          
Estimated to Be Received in 2017 40.0          
Estimated to Be Received in 2018 40.0          
Estimated to Be Received in 2019 40.0          
Estimated to Be Received in 2020 34.5          
Total Estimated Cash receipts 280.0       $ 280.0  
Micron Agreement [Member] | Royalty revenue            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cash Received 38.7 38.7 5.3      
Estimated to Be Received in 2016 39.5          
Estimated to Be Received in 2017 40.0          
Estimated to Be Received in 2018 40.0          
Estimated to Be Received in 2019 40.0          
Estimated to Be Received in 2020 34.5          
Total Estimated Cash receipts 276.7       $ 276.7  
Micron Agreement [Member] | Gain from settlement            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cash Received 1.3 1.3 0.2      
Estimated to Be Received in 2016 0.5          
Estimated to Be Received in 2017 0.0          
Estimated to Be Received in 2018 0.0          
Estimated to Be Received in 2019 0.0          
Estimated to Be Received in 2020 0.0          
Total Estimated Cash receipts 3.3          
SK hynix            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cash Received 56.0 48.0 24.0      
Estimated to Be Received in 2016 64.0          
Estimated to Be Received in 2017 48.0          
Estimated to Be Received in 2018 40.0          
Estimated to Be Received in 2019 32.0          
Estimated to Be Received in 2020 and thereafter 216.0          
Total Estimated Cash receipts 528.0     $ 528.0   $ 240.0
SK hynix | Royalty revenue            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cash Received 55.3 47.3 23.6      
Estimated to Be Received in 2016 63.9          
Estimated to Be Received in 2017 48.0          
Estimated to Be Received in 2018 40.0          
Estimated to Be Received in 2019 32.0          
Estimated to Be Received in 2020 and thereafter 216.0          
Total Estimated Cash receipts 526.1     $ 526.1    
SK hynix | Gain from settlement            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cash Received 0.7 $ 0.7 $ 0.4      
Estimated to Be Received in 2016 0.1          
Estimated to Be Received in 2017 0.0          
Estimated to Be Received in 2018 0.0          
Estimated to Be Received in 2019 0.0          
Estimated to Be Received in 2020 and thereafter 0.0          
Total Estimated Cash receipts $ 1.9