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Income Taxes - Reconciliation of Tax Expense to Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal tax at statutory rates									$ 1,879	$ 1,738
State taxes, net of federal income tax benefit									453	586
Change of valuation allowance									2,032	1,565
Uncertain tax positions									61	(177)
Foreign income taxed at different rates									(261)	(273)
Foreign equity investment									172	0
Non-deductible expenses and other									458	186
Total income tax expense	$ 1,319	$ 770	$ 953	$ 1,752	$ 1,173	$ 505	$ 631	$ 1,316	$ 4,794	$ 3,625

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Income Tax Reconciliation, Nondeductible Expense and Other Reconciling Items

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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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