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Revenue from Unaffiliated Customers by Geographic Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 5,492	$ 6,875	$ 6,645
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,050	3,743	3,074
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,442	$ 3,132	$ 3,571

X

- Definition

Amount, excluding 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

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+ References

No definition available.

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