Stock-Based Compensation and Employee Benefit Plans - Employee Stock Purchase Plan (Details)		12 Months Ended
	Jul. 25, 2018 shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 30, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense | $		$ 196,291,000	$ 168,482,000	$ 29,101,000
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share maximum per employee		2,500
Purchase period		6 months
Dollar maximum per employee | $		$ 25,000
2018 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock reserved for issuance (in shares)		3,030,407
Employee stock purchase plan, compensation expense | $		$ 10,278,000	$ 4,584,000
Shares issued in period		1,718,433
2018 ESPP | Employee Stock | Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	3,333,333
Number of common stock reserved for issuance (in shares)					33,333,333
Purchase price of common stock, percentage of fair market value		85.00%
Number of share reserved for issuance increase, term	9 years
Percentage of total outstanding shares for ESPP	0.01
Number of additional shares authorized		1,415,507