Earnings Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss) attributable to common stockholders	$ 37,447	$ 28,990	$ (4,074)	$ 13,835
Denominator:
Weighted average shares used to compute net income (loss) per share attributable to common stockholders, basic (in shares)	125,003	117,652	121,813	115,790
Weighted average effect of potentially dilutive shares to purchase common stock (in shares)	9,545	7,499	0	7,855
Weighted average shares used to compute net income (loss) per share attributable to common stockholders, diluted (in shares)	134,548	125,151	121,813	123,645
Net income (loss) per share attributable to common stockholders
Basic (in dollars per share)	$ 0.30	$ 0.25	$ (0.03)	$ 0.12
Diluted (in dollars per share)	$ 0.28	$ 0.23	$ (0.03)	$ 0.11