Agreement with SK hynix (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended			12 Months Ended
	May 31, 2013 SK hynix	Dec. 31, 2013 SK hynix	Jun. 11, 2013 SK hynix	Dec. 31, 2013 Micron	Dec. 09, 2013 Micron
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of patent license agreement			5 years		7 years
Initial renewal term				3 years
Renewal term				5 years
Amount to be paid, as a percentage				0.60%
Amount to be paid quarterly		$ 12.0	$ 12.0	$ 10.0	$ 10.0
Maximum amount to be paid annually					40.0
Future Receivables		216.0		274.5
Credit against settlement award	$ 250.0