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Agreements with SK hynix and Micron (Details) - USD ($) $ in Millions | Jun. 18, 2015 | Dec. 09, 2013 | Jun. 11, 2013 | Sep. 30, 2016 | Jun. 30, 2015
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SK hynix [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
License Agreement, Term of Agreement | 6 years |  | 5 years |  |
License Agreement, Average Amount to be Paid Quarterly |  |  |  |  | $ 12.0
Future Receivables |  |  |  |  | 432.0
Micron [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
License Agreement, Term of Agreement |  | 7 years |  |  |
Amount to be paid quarterly |  |  |  | $ 10.0 |
Future Receivables |  |  |  | $ 164.5 |
Maximum [Member] | SK hynix [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Amount to be paid quarterly |  |  |  |  | 16.0
Minimum | SK hynix [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Amount to be paid quarterly |  |  |  |  | $ 8.0

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