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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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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
Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Intangible Assets
Less accumulated amortization	$ (19,796)		$ (18,535)
Total	23,579		24,840
Additional disclosures
Amortization expense	1,300	$ 1,300
Capitalized patent defense costs
Intangible Assets
Capitalized patent defense costs	$ 43,375		$ 43,375
Capitalized patent defense costs \| Minimum
Intangible Assets
Weighted- Average Life (Years)	2 years 9 months 3 days
Capitalized patent defense costs \| Maximum
Intangible Assets
Weighted- Average Life (Years)	7 years 3 days