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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |  |  |
Non-deductible reserves and accruals | $ 4,936 | $ 8,189 |  |
Net operating loss and other carryforwards | 8,528 | 7,560 |  |
Stock compensation | 2,644 | 5,327 |  |
Depreciation and amortization | 402 | 1,196 |  |
Other assets | 46 | 50 |  |
Gross deferred tax asset | 16,556 | 22,322 |  |
Less - valuation allowance | (2,686) | (2,193) | $ (1,534) | $ (1,565)
Sub-total | 13,870 | 20,129 |  |
Other liabilities | (911) | (453) |  |
Goodwill amortization | (5,677) | (5,013) |  |
Deferred commissions | (3,873) | (4,928) |  |
Net deferred tax asset | $ 3,409 | $ 9,735 |  |

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