Net Income per Share - Basic and Diluted Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ 10,379	$ 2,204	$ 7,971	$ 3,462
Denominator:
Weighted-average shares outstanding— basic (in shares)	72,030,143	75,648,621	71,516,532	75,250,562
Effect of dilutive securities (in shares)	4,195,037	2,859,938	4,557,361	3,405,553
Weighted-average shares outstanding— diluted (in shares)	76,225,180	78,508,559	76,073,893	78,656,115
Basic net income per share (in dollars per share)	$ 0.14	$ 0.03	$ 0.11	$ 0.05
Diluted net income per share (in dollars per share)	$ 0.14	$ 0.03	$ 0.10	$ 0.04