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Description of Business and Basis of Presentation Patent Acquisition (Details) - patent_portfolios | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of patent portfolios acquired | 2 | 1 | 2

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