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Reconciliation of Federal Statutory Rate to Effective Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Rate Reconciliation [Line Items] |  |  |
Income before income taxes | $ 21,436 | $ 7,248 | $ 11,692
Expected tax at statutory rate | 4,502 | 2,537 | 3,975
Adjustments due to: |  |  |
Difference between U.S. and foreign tax | 345 | (1,797) | (2,031)
State income and franchise tax | (146) | (307) | (326)
Business tax credits | (1,523) | (708) | (236)
Stock-based compensation expense | (1,213) | (946) | 31
Transaction costs | 0 | 1,232 | 156
U.S. taxation of foreign earnings | 2,190 |  |
Executive compensation | 367 | 265 | 0
Other | 97 | 205 | 380
Change in U.S. federal tax rates | 0 | (12,839) |
Change in U.S. state tax rates | 748 | (151) |
Change in Netherlands tax rate | (388) | 0 | 0
Transition tax | (1,338) | 3,266 |
Uncertain tax provisions | 1,021 | 241 | 0
Change in valuation allowance | 125 | (12,164) | (1,981)
Return to provision adjustments | 33 | (161) | 0
Other | (1) | 222 | 43
Income tax (benefit) provision | $ 4,819 | $ (21,105) | $ 11
Expected tax at statutory rate | 21.00% | 35.00% | 34.00%
Adjustments due to: |  |  |
Difference between U.S. and foreign tax | 1.60% | (24.80%) | (17.40%)
State income and franchise tax | (0.70%) | (4.20%) | (2.80%)
Business tax credits | (7.10%) | (9.80%) | (2.00%)
Stock-based compensation expense | (5.70%) | (13.10%) | 0.30%
Transaction costs | 0.00% | 17.00% | 1.30%
U.S. taxation of foreign earnings | 10.20% | 0.00% | 0.00%
Executive compensation | 1.70% | 3.70% | 0.00%
Other | 0.50% | 2.80% | 3.30%
Change in U.S. federal tax rates | 0.00% | (177.10%) | 0.00%
Change in U.S. state tax rates | 3.50% | (2.10%) | 8212.00%
Change in Netherlands tax rate | (1.80%) | 0.00% | 0.00%
Transition tax | (6.20%) | 45.10% | 0.00%
Uncertain tax provisions | 4.80% | 3.30% | 0.00%
Change in valuation allowance | 0.60% | (167.80%) | (16.90%)
Return to provision adjustments | 0.20% | (2.20%) | 0.00%
Other | (0.10%) | 3.00% | 0.40%
Income tax (benefit) provision | 22.50% | (291.20%) | 0.10%

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