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Reconciliation of Federal Statutory Rate to Effective Income Tax Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
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%