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Earnings per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Numerator (for basic and diluted earnings (loss) per share) |  |  |  |
Net income (loss) | $ 1,931 | $ (12,915) | $ 9,310 | $ (8,053)
Denominator |  |  |  |
Basic weighted-average shares outstanding | 35,070,449 | 34,779,125 | 34,944,056 | 34,681,262
Common stock equivalents arising from stock options and restricted stock awards | 555,000 |  | 579,000 |
Diluted weighted-average shares outstanding | 35,624,590 | 34,779,125 | 35,522,568 | 34,681,262

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