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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Tax provision at statutory U.S. rate | $ 2,551 | $ 8,554 | $ 12,232
Increase (decrease) in tax provision resulting from: |  |  |
State and local taxes, net | (733) | (553) | (554)
Foreign tax rate differential | (296) | (3,244) | (5,762)
Foreign undistributed earnings, net of credits | 14,211 | 0 | 0
Nondeductible items | 891 | 839 | 874
Federal research and development credits | (620) | (710) | (678)
Non-territorial income | (1,517) | (1,458) | (1,906)
Withholding tax | 1,078 | 1,762 | 1,985
Change in deductibility of social insurance | 5 | 8 | 649
Uncertain tax positions | 1,344 | 165 | 10
Stock-based compensation | 479 | 0 | 0
Federal tax rate change | 686 | 0 | 0
Valuation allowance | 149 | 1,598 | 621
Foreign permanent benefit | (451) | (2,110) | (675)
Other | (166) | (47) | 6
Total provision for income taxes | $ 17,611 | $ 4,804 | $ 6,802

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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