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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Tax provision at statutory U.S. rate | $ 2,185 | $ 5,495 | $ 2,551
Increase (decrease) in tax provision resulting from: |  |  |
State and local taxes, net | (1,903) | (1,792) | (733)
Foreign tax rate differential | (1,810) | (2,079) | (296)
Foreign undistributed earnings, net of credits | 1,181 | 5,329 | 14,211
Nondeductible items | 1,236 | 1,197 | 891
Federal research and development credits | (884) | (713) | (620)
Non-territorial income | (1,806) | (1,079) | (1,517)
Withholding tax | 1,082 | 5,454 | 1,078
Uncertain tax positions | (294) | (159) | 1,344
Stock-based compensation | 262 | 213 | 479
Federal tax rate change | (412) | 466 | 686
Valuation allowance | 7,524 | 8,057 | 149
Foreign permanent benefit | (856) | (7,077) | (451)
Provision to return | 584 | 0 | 0
Other | 683 | 930 | (161)
Total provision for income taxes | $ 6,772 | $ 14,242 | $ 17,611

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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 expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + 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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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