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Stock-Based Compensation and Employee Benefit Plan - Restricted Stock Units (Additional Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense $ 180,300,000 $ 30,500,000 $ 28,200,000
Stock-based compensation vesting period 4 years    
Issuance of common stock upon exercise of warrants (in shares) 312,575    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense $ 142,400,000 1,300,000 300,000
Fair value of RSUs grants in period 16.02 30.96 $ 30.96
Unrecognized stock-based compensation cost $ 163,800,000 $ 97,200,000  
Expense expected to be recognized over a weighted-average period 9 months 25 days 2 years 1 month 6 days