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Income Tax - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Operating expenses not currently deductible $ 8,989 $ 9,714
Stock option and other employee benefit plans 19,496 15,932
Loss and credit carryforwards 17,999 0
Total deferred income tax assets 46,484 25,646
Valuation allowance (1,049) 0
Total deferred income tax assets, net of valuation allowance 45,435 25,646
Intangible assets (70,752) (60,189)
Property and equipment (8,455) (5,699)
Prepaid expenses (4,079) (190)
Deferred revenue (3,940) (6,447)
Total deferred income tax liabilities (87,226) (72,525)
Net deferred income tax liabilities $ (41,791) $ (46,879)