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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income (loss)	$ (9,333)	$ 526	$ (19,065)	$ (6,108)
Denominator:
Weighted-average shares used in computing net income (loss) per share, basic and diluted	114,572	102,652	112,734	101,079
Net income (loss) per share, basic and diluted	$ (0.08)	$ 0.01	$ (0.17)	$ (0.06)
Weighted-average shares used in computing net income (loss) per share, diluted	114,572	121,698	112,734	101,079
Net income (loss) per share, diluted	$ (0.08)	$ 0.00	$ (0.17)	$ (0.06)