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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Federal tax at statutory rates									$ 1,651	$ 3,500	$ 902
State taxes, net of federal income tax benefit									113	276	219
Change of valuation allowance									1,577	895	816
Uncertain tax positions									(907)	(132)	(7,935)
Foreign income taxed at different rates									72	(509)	(124)
Non-deductible expenses and other									112	(38)	177
Total income tax expense	$ 466	$ 680	$ 771	$ 1,209	$ 542	$ 748	$ 1,548	$ 1,154	3,126	3,992	(5,945)
United States
Operating Loss Carryforwards [Line Items]
Change in enacted tax rate									681	0	0
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Change in enacted tax rate									$ (173)	$ 0	$ 0

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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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