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Income Taxes - Reconciliation of Tax Expense to Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal tax at statutory rates	$ 566	$ (2,860)
State taxes, net of federal income tax benefit	297	(248)
Change of valuation allowance	7	349
Uncertain tax positions	458	624
Foreign income taxed at different rates	66	(770)
Foreign tax credit	(270)	(595)
Foreign equity investment	0	12
PPP loan forgiveness	(768)	0
Non-deductible stock based compensation expenses and other	1,422	1,050
Total income tax expense (benefit)	$ 1,778	$ (2,438)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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