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Revenue Recognition - Schedule of Net Revenue Disaggregate by Product Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 63,992	$ 116,251
Smartphones
Disaggregation Of Revenue [Line Items]
Revenue	25,880	57,981
Feature Phones
Disaggregation Of Revenue [Line Items]
Revenue	35,332	52,714
Accessories/Other
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,780	$ 5,556

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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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