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Reconciliation of Federal Statutory Rate to Effective Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Rate Reconciliation [Line Items] |  |  |
Income before income taxes | $ 59,217 | $ 26,151 | $ 21,436
Expected tax at statutory rate | 12,436 | 5,492 | 4,502
Adjustments due to: |  |  |
Difference between U.S. and foreign tax | 618 | 436 | 345
State income and franchise tax | 133 | (179) | 91
Business tax credits | (4,660) | (2,746) | (1,760)
Stock-based compensation expense | (9,243) | (1,877) | (1,213)
U.S. taxation of foreign earnings | 51 | 2,227 | 2,190
Executive compensation | 1,401 | 841 | 367
Other | 896 | 92 | 97
Change in U.S. federal tax rates | (2,192) |  |
Change in U.S. state tax rates | (708) |  | 748
Change in Netherlands tax rate | 250 | (193) | (388)
Transition tax |  |  | (1,338)
Uncertain tax provisions | (168) | 1,069 | 1,021
Change in valuation allowance | (12) | (125) | 125
Return to provision adjustments | (89) | (79) | 33
Other | 578 | (218) | (1)
Income tax (benefit) provision | $ (709) | $ 4,740 | $ 4,819
Expected tax at statutory rate | 21.00% | 21.00% | 21.00%
Adjustments due to: |  |  |
Difference between U.S. and foreign tax | 1.00% | 1.70% | 1.60%
State income and franchise tax | 0.20% | (0.70%) | 0.40%
Business tax credits | (7.90%) | (10.50%) | (8.20%)
Stock-based compensation expense | (15.60%) | (7.20%) | (5.70%)
U.S. taxation of foreign earnings | 0.10% | 8.50% | 10.20%
Executive compensation | 2.40% | 3.20% | 1.70%
Other | 1.50% | 0.40% | 0.50%
Change in U.S. federal tax rates | (3.70%) | 0.00% | 0.00%
Change in U.S. state tax rates | (1.20%) | 0.00% | 3.50%
Change in Netherlands tax rate | 0.40% | (0.70%) | (1.80%)
Transition tax | 0.00% | 0.00% | (6.20%)
Uncertain tax provisions | (0.30%) | 4.10% | 4.80%
Change in valuation allowance | 0.00% | (0.50%) | 0.60%
Return to provision adjustments | (0.20%) | (0.30%) | 0.20%
Other | 1.00% | (0.80%) | (0.10%)
Income tax (benefit) provision | (1.20%) | 18.10% | 22.50%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. + 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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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, 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 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + 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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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. + 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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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + 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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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + 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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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + 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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