Goodwill and Other Intangibles - Components of Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 19,024	$ 19,173
Accumulated Amortization	11,666	10,939
Net Carrying Value of Intangible Assets	7,358	8,234
Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	10,197	10,267
Accumulated Amortization	5,295	4,908
Net Carrying Value of Intangible Assets	4,902	5,359
Trademarks and Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,943	1,948
Accumulated Amortization	1,511	1,468
Net Carrying Value of Intangible Assets	432	480
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,317	5,383
Accumulated Amortization	3,535	3,299
Net Carrying Value of Intangible Assets	1,782	2,084
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,567	1,575
Accumulated Amortization	1,325	1,264
Net Carrying Value of Intangible Assets	$ 242	$ 311

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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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.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph ((a)(1),(b))
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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