Segment Information and Operations by Geographic Area - Schedule of Revenue by Country (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 116,156	$ 84,074
Revenue from Contract with Customer Benchmark \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	116,156	84,074
Taiwan \| Revenue from Contract with Customer Benchmark \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	55,789	39,060
Hong Kong \| Revenue from Contract with Customer Benchmark \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	30,306	16,534
United States \| Revenue from Contract with Customer Benchmark \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	8,522	5,677
Other \| Revenue from Contract with Customer Benchmark \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Revenue	$ 21,539	$ 22,803

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.

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+ Details