Stock-Based Compensation and Employee Benefit Plan - Stock-based Compensation (Additional Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Arrangements with Employees and Nonemployees [Abstract]
Capitalized stock-based compensation costs	$ 0	$ 0
Share-based compensation expense	39,855,000	$ 71,677,000	$ 154,955,000	$ 87,451,000
Unrecognized compensation cost related to unvested stock options	48,000,000		$ 48,000,000
Expense expected to be recognized over a weighted-average period			2 years 7 months 17 days
Excess tax benefits			$ 0	$ 0
Restricted Stock
Share-based Arrangements with Employees and Nonemployees [Abstract]
Unrecognized stock-based compensation cost	76,900,000		$ 76,900,000
Expense expected to be recognized over remaining weighted-average period			1 year 1 month 10 days
Employee Stock Option
Share-based Arrangements with Employees and Nonemployees [Abstract]
Unrecognized stock-based compensation cost	$ 9,600,000		$ 9,600,000
Expense expected to be recognized over remaining weighted-average period			1 year 1 month 2 days