Net Income Per Share - Schedule of Computation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 30,065	$ 18,274
Denominator:
Weighted-average shares used to compute basic net income per share (in shares)	114,575	114,844
Dilutive effect of employee stock options (in shares)	7,651	9,051
Weighted-average shares used to compute diluted net income per share (in shares)	122,226	123,895
Net income per share
Basic (in dollars per share)	$ 0.26	$ 0.16
Diluted (in dollars per share)	$ 0.25	$ 0.15