Accelerated amortization expense (termination/sale)

No definition available.

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- Definition

Accumulated amortization, disposals

+ References

No definition available.

+ Details

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- Definition

Patent cost, disposals

+ References

No definition available.

+ Details

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- Definition

Patent Sales

+ References

No definition available.

+ Details

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- Definition

Patents, Accumulated Amortization

+ References

No definition available.

+ Details

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- Definition

Patents, Gross

+ References

No definition available.

+ Details

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- Definition

Carrying value for patents, net of accumulated amortization.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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Patents (Details) - USD ($)	3 Months Ended								12 Months Ended
Patents (Details) - USD ($)	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