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Earnings Per Share - Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ 25,111	$ 24,057	$ 27,800	$ 10,151	$ 49,168	$ 37,951
Denominator:
Weighted-average shares outstanding—basic	46,136		44,404		45,818	44,157
Effect of dilutive securities:
Options to purchase common stock	2,177		2,901		2,312	2,926
Employee stock purchase plan shares	83		143		100	133
Restricted stock	258		380		254	357
Weighted-average shares outstanding—diluted	48,654		47,828		48,484	47,573
Basic EPS	$ 0.54		$ 0.63		$ 1.07	$ 0.86
Diluted EPS	$ 0.52		$ 0.58		$ 1.01	$ 0.80
Anti-dilutive equity awards under stock-based award plans excluded from the determination of diluted EPS	633		668		633	668

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