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Summary of Significant Accounting Policies - Intangibles (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Patents, licenses, and other intangible assets
Number of primary criteria to determine capitalization of patent | item	3
Total gross carrying amount	$ 15,685,000	$ 14,114,000
Total intangible assets, net	11,148,000	10,362,000
Amortization expense for patents, licenses, and other intangible assets	784,000	755,000	$ 594,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018	838,000
2019	827,000
2020	780,000
2021	704,000
2022	676,000
Thereafter	2,364,000
Total	6,189,000
Nonamortizable intangible assets (trademarks)
Patents, licenses, and other intangible assets
Nonamortizable intangible assets (trademarks)	$ 399,000	399,000
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	$ (3,413,000)	(2,792,000)
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	$ 8,915,000	7,570,000
Patents, pending issuance
Patents, licenses, and other intangible assets
Amortizable intangible assets	4,360,000	4,134,000
Licenses and other amortizable intangible assets
Patents, licenses, and other intangible assets
Amortizable intangible assets	2,011,000	2,011,000
Accumulated amortization	(1,124,000)	(960,000)
Capitalized patent and licensing
Patents, licenses, and other intangible assets
Impairment of Intangible Assets (Excluding Goodwill)	396,000	$ 356,000	$ 296,000
In-process intangible assets
Patents, licenses, and other intangible assets
Total gross carrying amount	$ 4,400,000

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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