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Income Taxes - Reconciliation of Tax Expense to Effective Tax Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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