Goodwill - Schedule of Changes in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill
Goodwill beginning balance	$ 132,437	$ 134,187
Foreign currency translation adjustment	1,959	(2,779)
Goodwill ending balance	141,318	132,437
ERIS Acquisition of Yea Shin Technology Corporation
Goodwill
Acquisitions	4,320	$ 1,029
Canyon Investment
Goodwill
Acquisitions	1,671
Wafer Fabrication in Greenock, Scotland
Goodwill
Acquisitions	$ 931

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 45
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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.

+ References

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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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