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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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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 |  |

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