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v3.19.1

Patents (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Accrued Patent Acquisition Related Payments, Current | $ 3,750,000 | $ 0
Patents, accumulated amortization | $ 320,236,000 | $ 319,580,000
Weighted average useful life of patents and patent rights | 4 years |
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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