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Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss)	$ 2,543	$ 5,850	$ (1,729)	$ 13,865
Denominator (in thousands):
Basic weighted-average common stock outstanding	21,997	21,946	22,091	21,687
Effect of stock -based awards	431	737		793
Diluted weighted average common stock outstanding	22,428	22,683	22,091	22,480
Basic net income (loss) per share	$ 0.12	$ 0.27	$ (0.08)	$ 0.64
Diluted net income (loss) per share	$ 0.11	$ 0.26	$ (0.08)	$ 0.62

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