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Income Taxes - Reconciliation of Tax Provision at Statutory U.S. Rate to Provision for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Tax provision at statutory U.S. rate | $ 5,495 | $ 2,551 | $ 8,554
Increase (decrease) in tax provision resulting from: |  |  |
State and local taxes, net | (1,792) | (733) | (553)
Foreign tax rate differential | (2,079) | (296) | (3,244)
Foreign undistributed earnings, net of credits | 5,329 | 14,211 | 0
Nondeductible items | 1,197 | 891 | 839
Federal research and development credits | (713) | (620) | (710)
Non-territorial income | (1,079) | (1,517) | (1,458)
Withholding tax | 5,454 | 1,078 | 1,762
Change in deductibility of social insurance | (3) | 5 | 8
Uncertain tax positions | (159) | 1,344 | 165
Stock-based compensation | 213 | 479 | 0
Federal tax rate change | 466 | 686 | 0
Valuation allowance | 8,057 | 149 | 1,598
Foreign permanent benefit | (7,077) | (451) | (2,110)
Other | 933 | (166) | (47)
Total provision for income taxes | $ 14,242 | $ 17,611 | $ 4,804

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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