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Contingencies (Details) | Mar. 30, 2018 number_patents | Sep. 15, 2017 number_patents | Mar. 08, 2017 number_patents | Feb. 24, 2017 number_patents | Aug. 25, 2016 number_patents | Jun. 06, 2016 number_patents | Dec. 31, 2018 USD ($)
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Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency accrual | $ |  |  |  |  |  |  | $ 0
AgaMatrix |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of patents allegedly infringed |  |  |  |  |  | 3 |
WaveForm Technologies, Inc. |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of patent infringement claims transferred to new plaintiff |  |  |  | 3 |  |  |
Number of petitions for inter partes review seeking determination that asserted patents are invalid | 2 |  | 3 |  | 2 |  |
AgaMatrix |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of patents in filed patent infringement lawsuit |  | 2 |  |  |  |  |

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