Net Income Per Share - Computation of Numerators and Denominators Used in Basic and Diluted Net Income Per Share Amounts (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net income	$ 11,528	$ 14,360
Interest expense related to Convertible Notes, net of tax	144
Numerator for diluted income per share	$ 11,672	$ 14,360
Denominator:
Weighted average number of shares used in computing net income per share, basic	79,462	74,651
Effect of dilutive securities, stock options, RSUs and ESPP shares	7,799	4,644
Denominator for dilutive income per share	87,261	79,295
Net income per share attributable to common stockholders, basic	$ 0.15	$ 0.19
Net income per share attributable to common stockholders, diluted	$ 0.13	$ 0.18