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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]        
Non-deductible reserves and accruals $ 3,835 $ 4,936    
Net operating loss and other carryforwards 7,954 8,528    
Stock compensation 2,125 2,644    
Depreciation and amortization 727 402    
Other assets   46    
Gross deferred tax asset 14,641 16,556    
Less - valuation allowance (2,574) (2,686) $ (2,193) $ (1,534)
Sub-total 12,067 13,870    
Other liabilities (1,249) (911)    
Goodwill and intangible assets (6,201) (5,677)    
Deferred commissions (4,479) (3,873)    
Net deferred tax asset $ 138 $ 3,409