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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, 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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- 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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