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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
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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 |  |

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