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Segment Information (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Major customer disclosure
Revenue	$ 84,859	$ 61,717	$ 155,241	$ 127,494
USA
Major customer disclosure
Revenue	45,541	32,014	91,692	66,802
Taiwan
Major customer disclosure
Revenue	9,018	3,752	17,861	10,816
South Korea
Major customer disclosure
Revenue	2,209	701	2,597	2,521
Japan
Major customer disclosure
Revenue	3,826	7,943	8,414	12,574
Europe
Major customer disclosure
Revenue	1,187	4,944	1,633	5,682
Canada
Major customer disclosure
Revenue	38	31	92	543
Singapore
Major customer disclosure
Revenue	14,330	8,802	20,668	16,432
Asia-Other
Major customer disclosure
Revenue	$ 8,710	$ 3,530	$ 12,284	$ 12,124

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- Definition

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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