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Summary of Significant Accounting Policies - Intangibles (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Patents, licenses, and other intangible assets
Number of primary criteria to determine capitalization of patent | item	3
Abandonment of capitalized intangible assets	$ 239	$ 396	$ 356
Total gross carrying amount	17,374	15,685
Patents, licenses, and other intangible assets, net	11,969	11,148
Amortization expense for patents, licenses, and other intangible assets	900	800	$ 800
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019	862
2020	860
2021	757
2022	730
2023	659
Thereafter	1,923
Total	5,791
Nonamortizable intangible assets (trademarks)
Patents, licenses, and other intangible assets
Nonamortizable intangible assets (trademarks)	$ 399	399
Acquired licenses | Minimum
Patents, licenses, and other intangible assets
Estimated economic life	5 years
Acquired licenses | Maximum
Patents, licenses, and other intangible assets
Estimated economic life	25 years
Patents
Patents, licenses, and other intangible assets
Accumulated amortization	$ (4,142)	(3,413)
Patents | Minimum
Patents, licenses, and other intangible assets
Estimated economic life	13 years
Patents | Maximum
Patents, licenses, and other intangible assets
Estimated economic life	20 years
Patents, definite life
Patents, licenses, and other intangible assets
Amortizable intangible assets	$ 9,320	8,915
Patents, pending issuance
Patents, licenses, and other intangible assets
Amortizable intangible assets	5,644	4,360
Licenses and other amortizable intangible assets
Patents, licenses, and other intangible assets
Amortizable intangible assets	2,011	2,011
Accumulated amortization	(1,263)	$ (1,124)
In-process intangible assets
Patents, licenses, and other intangible assets
Total gross carrying amount	$ 5,600

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