Net Loss per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Earnings per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders	$ (32,746)	$ (17,114)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	296,077	85,078
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.11)	$ (0.20)
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders		$ (17,114)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)		85,078
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)		$ (0.20)
Class A common stock | Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders	$ (10,876)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	98,337
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.11)
Class B common stock | Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders	$ (21,870)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	197,740
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.11)