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Agreement with SK hynix (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended
May 31, 2013
Sep. 30, 2013
Sep. 30, 2013
SK hynix [Member]
Jun. 11, 2013
SK hynix [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Term of patent license agreement       5 years
Amount to be paid quarterly     $ 12.0 $ 12.0
Future Receivables   228.0    
Credit against settlement award $ 250.0