Goodwill - Schedule of Changes in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Goodwill
Goodwill beginning balance	$ 141,318	$ 132,437
Foreign currency translation adjustment	3,051	1,959
Goodwill ending balance	158,331	141,318
ERIS Acquisition of Yea Shin Technology Corporation
Goodwill
Acquisitions		4,320
Canyon Investment
Goodwill
Acquisitions		1,671
Wafer Fabrication in Greenock, Scotland
Goodwill
Acquisitions		$ 931
Savitech Acquisitions
Goodwill
Acquisitions	$ 13,962

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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-Name Accounting Standards Codification
-Topic 350
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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