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Basic Net Income (loss) Per Share is Calculated Using Weighted Average Number of Shares (Detail) - $ / shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings per share – basic $ 0.00 $ 0.07
Earnings per share – diluted $ 0.00 $ 0.06
Weighted average shares of common stock outstanding – basic 34,496,622 32,421,467
Weighted average shares of common stock outstanding – diluted 38,074,174 38,098,373