Related Party Transactions - Schedule of Redeemable Preferred Stock Issued to Related Parties (Details) - Series G Redeemable Convertible Preferred Stock - USD ($) $ in Thousands	1 Months Ended
	Feb. 28, 2018	Feb. 15, 2018	Feb. 12, 2018
Related Party Transaction [Line Items]
Shares of stock issued (in shares)	55,666,004	55,666,004
Aggregate purchase price	$ 560,000	$ 560,000
Affiliated Entity | OCHA LLC
Related Party Transaction [Line Items]
Shares of stock issued (in shares)		50,000
Aggregate purchase price		$ 503
Affiliated Entity | VGE III Portfolio Ltd
Related Party Transaction [Line Items]
Shares of stock issued (in shares)		279,160
Affiliated Entity | Viking Global Equities LP
Related Party Transaction [Line Items]
Shares of stock issued (in shares)		148,974
Affiliated Entity | Viking Global Equities II LP
Related Party Transaction [Line Items]
Shares of stock issued (in shares)		8,737
Affiliated Entity | Viking Global Opportunities Illiquid Investments Sub-Master LP
Related Party Transaction [Line Items]
Shares of stock issued (in shares)		129,537
Affiliated Entity | Viking Long Fund Master Ltd
Related Party Transaction [Line Items]
Shares of stock issued (in shares)			179,118
Investee | Viking Global Investors LP and affiiated entities
Related Party Transaction [Line Items]
Shares of stock issued (in shares)		745,526
Aggregate purchase price		$ 7,500