Net Income (Loss) Per Share - Summary of Calculation of Basic and Diluted Net Income (Loss) 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)	$ 12,947	$ (25,155)	$ (84,813)	$ (44,220)
Denominator:
Weighted-average shares used in computing net income (loss) per share —basic	125,687	116,681	122,837	114,064
Net income (loss) per share —basic	$ 0.10	$ (0.22)	$ (0.69)	$ (0.39)
Weighted-average shares used in computing net income (loss) per share —basic	125,687	116,681	122,837	114,064
Common stock equivalents	10,982
Weighted-average shares used in computing net income (loss) per share —diluted	136,669	116,681	122,837	114,064
Net income (loss) per share —diluted	$ 0.09	$ (0.22)	$ (0.69)	$ (0.39)