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v3.19.1

Patents (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Patents [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized patent costs | $ 117,970,000 |  |  |  | $ 0 |  |  |  | $ 117,970,000 | $ 0
Patents, net | 6,587,000 |  |  |  | 61,917,000 |  |  |  | $ 6,587,000 | 61,917,000
Patents, weighted average useful life |  |  |  |  |  |  |  |  | 4 years |
Accelerated amortization expense (termination) |  |  |  |  |  |  |  |  | $ 8,307,000 |
Impairment of Patent-Related Intangible Assets | 0 | $ 0 | $ 28,210,000 | $ 0 | 0 | $ 2,248,000 | $ 0 | $ 0 | 28,210,000 | 2,248,000
Accumulated amortization / impairment charges | 109,663,000 |  |  |  | 0 |  |  |  | 109,663,000 | 0
Sales proceeds |  |  |  |  |  |  |  |  | $ 14,500,000 | 0
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 1 year |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 5 years |
Patents [Member] |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |
Gross carrying amount - patents | 326,167,000 |  |  |  | 444,137,000 |  |  |  | $ 326,167,000 | 444,137,000
Accumulated amortization - patents | 319,580,000 |  |  |  | 382,220,000 |  |  |  | 319,580,000 | 382,220,000
Patents, net | $ 6,587,000 |  |  |  | $ 61,917,000 |  |  |  | $ 6,587,000 | $ 61,917,000
Patents [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 1 year |
Patents [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 5 years |

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