Stock-Based Compensation and Employee Benefit Plan - Stock Options (Additional Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Share-based Arrangements with Employees and Nonemployees [Abstract]
Granted (in dollars per share)	$ 7.30		$ 7.30
Unrecognized compensation cost related to unvested stock options	$ 25,100,000		$ 25,100,000		$ 48,000,000.0
Expense expected to be recognized over remaining weighted-average period			2 years 1 month 6 days	2 years 7 months 6 days
Excess tax benefits			$ 0	$ 0
Cash received from Stock options exercised			4,200,000	1,400,000
Employee Stock Option
Share-based Arrangements with Employees and Nonemployees [Abstract]
Allocated share-based compensation expense	$ 4,400,000	$ 8,500,000	$ 14,900,000	$ 26,700,000
Class A common stock
Share-based Arrangements with Employees and Nonemployees [Abstract]
Granted options (in shares)	0		200,000