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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-lived intangible assets
Gross Carrying Amount	$ 31,962	$ 30,648
Accumulated Amortization	(17,519)	(15,532)
Indefinite-lived intangible assets Goodwill	29,508	27,840	$ 15,621
Patents [Member]
Finite-lived intangible assets
Gross Carrying Amount	4,806	4,806
Accumulated Amortization	(4,806)	(4,806)
Land Use Rights [Member]
Finite-lived intangible assets
Gross Carrying Amount	1,286	1,128
Accumulated Amortization	(396)	(331)
Trademark [Member]
Finite-lived intangible assets
Gross Carrying Amount	1,756	1,718
Accumulated Amortization	(1,474)	(1,358)
Technology [Member]
Finite-lived intangible assets
Gross Carrying Amount	7,673	7,185
Accumulated Amortization	(2,402)	(1,708)
Customer Relationships [Member]
Finite-lived intangible assets
Gross Carrying Amount	16,441	15,811
Accumulated Amortization	$ (8,441)	$ (7,329)

X

- Definition

Accumulated amount of 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 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

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
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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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