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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Taxes [Line Items] |  |  |  |
Provision for (benefit from) income taxes | $ 918,000 | $ 1,083,000 | $ 890,000 | $ 2,219,000
Effective income tax rate | 5.50% | 3.40% | 1.70% | 19.80%
Discrete tax benefit (expenses) | $ 0 |  |  |

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