Redeemable Convertible Preferred Stock - Additional Information (Details)		12 Months Ended
	Apr. 02, 2019 shares	Dec. 31, 2019 USD ($)	Dec. 31, 2016 USD ($)	Mar. 28, 2019 vote $ / shares shares
Class of Stock [Line Items]
Voting power percentage of total outstanding stock		50.00%
Non-cash settlement value		$ 5,152,047,000
Series H
Class of Stock [Line Items]
Redeemable convertible preferred stock, voting interest required for approval		71.00%
Class A Common Stock
Class of Stock [Line Items]
Conversion of convertible preferred stock to common stock in connection with direct listing (in shares) | shares	219,200,000
Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Number of votes for each share of common stock | vote				1
Dividends declared and paid		$ 0
Warrant To Purchase Series E Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Number of shares subject to purchase from warrant (in shares) | shares				2,571,275
Exercise price of warrants (in dollars per share) | $ / shares				$ 19.45
Fair value gain from issuance of redeemable preferred stock warrants			$ 2,900,000
Non-cash settlement value			$ 8,100,000