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Agreement with SK hynix and Micron (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 SK hynix [Member] | Jun. 11, 2013 SK hynix [Member] | Mar. 31, 2014 Micron [Member] | Dec. 09, 2013 Micron [Member]
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Term of patent license agreement |  | 5 years |  | 7 years
Amount to be paid quarterly | $ 12.0 |  | $ 10.0 |
Future Receivables | $ 204.0 |  | $ 264.5 |

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- Details
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