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, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Expense derived by applying the Federal income tax rate to income (loss) before income taxes $ 5,335 $ 9,620 $ (4,572)
State income tax, net of federal benefit 135 735 561
Foreign income tax (631) (922) (813)
Nondeductible expenses 1,606 545 418
Fair value adjustment on stock acquisition (17) 150 (52)
Stock-based expense (19,080) 285 209
Reduction in available Federal NOL 0 255 350
Federal income tax rate reduction 25,070 0 0
Deemed repatriation of foreign earnings 2,211 0 0
Other 235 168 53
Total income tax benefit $ 14,864 $ 10,836 $ (3,846)