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Nature of Business and Summary of Significant Accounting Policies - Schedule of Numerators and Denominators Used to Calculate Basic and Diluted Earnings Per Share (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator (for basic and diluted earnings per share) |  |  |
Net income (loss) | $ 8,211 | $ 17,707 | $ (7,121)
Denominator |  |  |
Basic weighted-average shares outstanding | 35,289,616 | 34,987,878 | 34,714,395
Common stock equivalents arising from stock options and restricted stock awards | 231,000 | 496,000 |
Diluted weighted-average shares outstanding | 35,520,670 | 35,484,273 | 34,714,395

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