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v3.10.0.1

Patents (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  | $ 28,210,000 |  |
Patents, accumulated amortization | $ 425,990,000 |  | $ 425,990,000 |  | $ 382,220,000
Weighted average useful life of patents and patent rights |  |  | 2 years |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ 0 | $ 2,248,000 | $ 29,210,000 | $ 2,248,000 |
Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life of patents and patent rights |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life of patents and patent rights |  |  | 5 years |  |

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