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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Federal tax at statutory rates									$ 1,738	$ 1,651	$ 3,500
State taxes, net of federal income tax benefit									586	113	276
Change of valuation allowance									1,565	1,577	895
Uncertain tax positions									(177)	(907)	(132)
Foreign income taxed at different rates									(273)	72	(509)
Non-deductible expenses and other									186	112	(38)
Total income tax expense	$ 1,173	$ 505	$ 631	$ 1,316	$ 466	$ 680	$ 771	$ 1,209	3,625	3,126	3,992
United States
Operating Loss Carryforwards [Line Items]
Change in enacted tax rate									0	681	0
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Change in enacted tax rate									$ 0	$ (173)	$ 0

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