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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Class $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) Class $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares
Earnings Per Share
Number of classes of common stock | Class	2		2
Numerator:
Net income | $	$ 20,292	$ 10,229	$ 48,705	$ 33,987
Denominator:
Weighted-average shares outstanding—basic	42,721	40,700	42,178	39,977
Effect of dilutive securities:
Options to purchase common stock	3,239	3,078	2,780	3,593
Employee stock purchase plan shares	270	322	273	250
Restricted stock	346	145	229	99
Weighted-average shares outstanding—diluted	46,576	44,245	45,460	43,919
Basic EPS | $ / shares	$ 0.47	$ 0.25	$ 1.15	$ 0.85
Diluted EPS | $ / shares	$ 0.44	$ 0.23	$ 1.07	$ 0.77
Anti-dilutive equity awards under stock-based award plans excluded from the determination of diluted EPS	167	899	167	899

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