Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Income Tax Benefit Computed at Federal Statutory Tax Rate to Actual Income Tax (Benefit) Expense (Detail)

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Income Taxes - Reconciliation of Income Tax Benefit Computed at Federal Statutory Tax Rate to Actual Income Tax (Benefit) Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Income Tax Disclosure [Abstract]        
Expense derived by applying the Federal income tax rate to income before income taxes $ 7,203 $ 5,335 $ 9,620  
State income tax, net of federal benefit (204) 135 735  
Foreign income tax 26 (631) (922)  
Change in valuation allowance 734 0   $ 0
Nondeductible expenses 2,187 1,606 545  
Fair value adjustment on stock acquisition 33 (17) 150  
Stock-based expense (11,788) (19,080) 285  
Reduction in available Federal NOL 0 0 255  
Federal income tax rate reduction 0 25,070 0  
Deemed repatriation of foreign earnings 0 2,211 0  
Base erosion and anti-abuse tax 1,117 0 0  
Other 267 235 168  
Total income tax expense $ (425) $ 14,864 $ 10,836