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Patents (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, net | $ 61,917 |  |  |  | $ 86,319 |  |  |  | $ 61,917 | $ 86,319 |
Patents, weighted average useful life |  |  |  |  |  |  |  |  | 4 years |  |
Payments to acquire intangible assets |  |  |  |  |  |  |  |  | $ 0 | 1,225 | $ 19,504
Impairment of Patent-Related Intangible Assets | 0 | $ 2,248 | $ 0 | $ 0 | 2,175 | $ 0 | $ 40,165 | $ 0 | $ 2,248 | 42,340 | $ 74,731
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 1 year |  |
Acquired Finite Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  | 2 years |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 6 years |  |
Acquired Finite Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  | 7 years |  |
Patents [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount - patents | 444,137 |  |  |  | 444,362 |  |  |  | $ 444,137 | 444,362 |
Accumulated amortization - patents | 382,220 |  |  |  | 358,043 |  |  |  | 382,220 | 358,043 |
Patents, net | $ 61,917 |  |  |  | $ 86,319 |  |  |  | $ 61,917 | $ 86,319 |
Patents [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 1 year |  |
Patents [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 6 years |  |

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