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.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Intangible Assets
Less accumulated amortization	$ (17,274)		$ (17,274)		$ (13,356)
Total	26,101		26,101		31,368
Additional disclosures
Amortization expense	1,300	$ 1,300	3,900	$ 3,900
Capitalized patent defense costs
Intangible Assets
Capitalized patent defense costs	$ 43,375		$ 43,375		$ 44,724
Capitalized patent defense costs \| Minimum
Intangible Assets
Weighted- Average Life			3 years 3 months 4 days		3 years 3 months 4 days
Capitalized patent defense costs \| Maximum
Intangible Assets
Weighted- Average Life			7 years 6 months 4 days		7 years 6 months 4 days