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Patent Sale and License (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 Memory technology patents Item | Dec. 31, 2011 Sale of memory technology patents Memory technology patents | Dec. 31, 2011 Sale of memory technology patents Domestic memory technology patents Item | Dec. 31, 2011 Sale of memory technology patents Foreign memory technology patents Item
Patent Sale and License |  |  |  |  |  |  |
Number of intangible assets sold |  |  |  | 73 |  | 43 | 30
Cash consideration |  |  |  |  | $ 35,000,000 |  |
Gain on sale of assets |  |  |  |  | 35,600,000 |  |
Net cash proceeds from sale of assets | 630,000 | 3,437,000 | 34,831,000 |  | 35,000,000 |  |
Patent license recorded in connection with patent sale |  |  | 780,000 |  | 800,000 |  |
Valuation of right to use patents |  |  |  |  | $ 800,000 |  |
Estimated useful life |  |  |  |  | 7 years |  |

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