Stock-Based Compensation and Employee Benefit Plan - Stock-bases Compensation (Additional Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Arrangements with Employees and Nonemployees [Abstract]
Capitalized stock-based compensation costs	$ 0	$ 0
Share-based compensation expense	63,882,000	7,956,000
Unrecognized compensation cost related to unvested stock options	$ 65,800,000
Expense expected to be recognized over a weighted-average period	2 years 8 months 27 days
Excess tax benefits	$ 0	$ 0
Restricted Stock
Share-based Arrangements with Employees and Nonemployees [Abstract]
Unrecognized stock-based compensation cost	$ 145,500,000
Expense expected to be recognized over remaining weighted-average period	1 year 3 months 7 days
Employee Stock Option
Share-based Arrangements with Employees and Nonemployees [Abstract]
Unrecognized stock-based compensation cost	$ 8,800,000
Expense expected to be recognized over remaining weighted-average period	1 year 1 month 28 days