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Description of Business (Details) - patents | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Description of Business [Line Items] |  |  |  |
Number of patent portfolios acquired | 1 | 2 | 3 | 6

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- Definition Number of patent portfolios acquired + References No definition available. + Details
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