Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|---|---|---|---|---|
| Income Tax Disclosure [Abstract] | ||||
| Non-deductible reserves and accruals | $ 8,189 | $ 9,795 | ||
| Net operating loss and other carryforwards | 7,560 | 7,862 | ||
| Stock compensation | 5,327 | 5,900 | ||
| Depreciation and amortization | 1,196 | 813 | ||
| Other assets | 50 | 490 | ||
| Gross deferred tax asset | 22,322 | 24,860 | ||
| Less - valuation allowance | (2,193) | (1,534) | $ (1,565) | $ (2,200) |
| Sub-total | 20,129 | 23,326 | ||
| Depreciation and amortization | (453) | |||
| Goodwill amortization | (5,013) | (5,097) | ||
| Deferred commissions | (4,928) | (5,344) | ||
| Net deferred tax asset | $ 9,735 | $ 12,885 |