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Segment Information (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Major customer disclosure
Revenue	$ 81,282	$ 56,915	$ 236,523	$ 184,409
USA
Major customer disclosure
Revenue	55,337	29,068	147,029	95,870
Taiwan
Major customer disclosure
Revenue	4,170	8,234	22,031	19,050
South Korea
Major customer disclosure
Revenue	1,350	719	3,947	3,240
Japan
Major customer disclosure
Revenue	3,095	4,175	11,509	16,749
Europe
Major customer disclosure
Revenue	661	728	2,294	6,410
Canada
Major customer disclosure
Revenue	19	534	111	1,077
Singapore
Major customer disclosure
Revenue	8,214	6,754	28,882	23,186
Asia-Other
Major customer disclosure
Revenue	$ 8,436	$ 6,703	$ 20,720	$ 18,827

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 924
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-Section S99
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