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Agreement with SK hynix (Details) - USD ($)
$ in Millions
 1 Months Ended
Jun. 18, 2015
Dec. 09, 2013
Jun. 11, 2013
May. 31, 2013
Dec. 31, 2015
Jun. 30, 2015
SK hynix            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Term of patent license agreement 6 years   5 years      
License Agreement, Average Amount to be Paid Quarterly           $ 12.0
Future Receivables           432.0
Credit against settlement award       $ 250.0    
Micron            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Term of patent license agreement   7 years        
Amount to be paid quarterly         $ 10.0  
Future Receivables         $ 194.5  
Maximum [Member] | SK hynix            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Amount to be paid quarterly           16.0
Minimum [Member] | SK hynix            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Amount to be paid quarterly           $ 8.0