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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Components of Income Tax Expense

The components of income tax expense are as follows:

		Year Ended December 31
		2018				2019				2020
		US$				US$				US$
Current			13,455				6,558				6,479
Deferred			(1,664	)			1,118				(667	)
Income tax expense			11,791				7,676				5,812

Income (Loss) Before Income Taxes for Domestic and Foreign Entities

The income (loss) before income taxes for domestic and foreign entities is as follows:

		Year Ended December 31
		2018				2019				2020
		US$				US$				US$
Domestic			(23,750	)			(3,911	)			(17,067	)
Foreign			133,611				75,985				102,625
		109,861				72,074				85,558

Reconciliation of Income Tax Expense on Pretax Income at Statutory Rate and Income Tax Expense

The Company and its subsidiaries file separate income tax returns. A reconciliation of income tax expense on pretax income at statutory rate and income tax expense is shown below:

		Year Ended December 31
		2018				2019				2020
		US$				US$				US$
Tax expense at statutory rate of Cayman			—				—				—
Differences between Cayman and foreign statutory tax rates			12,509				846				5,286
Permanent differences			(703	)			4,109				1,441
Temporary differences			(159	)			638				(129	)
Alternative minimum tax			9				1				1
Income tax on undistributed earnings			408				575				1,196
Net changes in income tax credit			116				3,917				20
Net changes in valuation allowance of deferred income tax assets			1,243				(1,820	)			2,439
Net operating loss carryforwards			(1,431	)			(294	)			(1,180	)
Liabilities related to unrealized tax benefits			(302	)			(171	)			(3,066	)
Adjustment of prior years’ taxes and others			101				(125	)			(196	)
Income tax expense			11,791				7,676				5,812

Deferred Income Tax Assets (Liabilities)

Deferred income tax assets (liabilities) are as follows:

		December 31
		2019				2020
		US$				US$
Notes and accounts receivable			3				—
Stock-based compensation			1,104				1,339
Allowance for sales return			541				324
Inventory reserve			1,733				1,925
Foreign currency translation			(20	)			47
Property and equipment			(359	)			(483	)
Investment tax credits			4,532				4,512
Net operating loss carryforwards			14,028				16,754
Others			494				1,013
Valuation allowance			(18,108	)			(20,816	)
			3,948				4,615

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits is as follows:

		Year Ended December 31
		2018				2019				2020
		US$				US$				US$
Balance, beginning of year			15,056				18,707				20,655
Increases in tax positions taken in current year			5,937				6,890				5,029
Decrease in tax position taken in prior year primarily related to the resolution of tax audit			(2,286	)			(4,942	)			(6,683	)
Balance, end of year			18,707				20,655				19,001

Summary of Major Jurisdictions and Tax Year Subject to Examination by Tax Authorities

The Company files income tax returns in the U.S. and foreign jurisdictions. The following table summarizes the Company’s major jurisdictions and tax year that remain subject to examination by tax authorities as of December 31, 2020:

Tax Jurisdiction		Tax Years
China		2017 and onward
Hong Kong		2017 and onward
Taiwan		2015 and onward
United States		2015 onward

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