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Stock-Based Compensation - Additional Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
May 01, 2019
Oct. 07, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of options exercised $ 0      
Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant-date fair value (in dollars per share) $ 6.70 $ 18.38    
Fair value of vested restricted stock awards $ 9,100,000 $ 4,400,000    
Unrecognized compensation costs $ 36,600,000      
Unrecognized compensation costs, period for recognition 2 years 4 months 24 days      
Stock option awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs, period for recognition 1 year 6 months      
Fair value of stock options vested $ 4,400,000 3,700,000    
Intrinsic value of options exercised 0 $ 200,000    
Unrecognized compensation costs for stock options $ 6,200,000      
Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Weighted average grant-date fair value (in dollars per share) $ 6.68 $ 22.35    
Unrecognized compensation costs $ 6,700,000      
Unrecognized compensation costs, period for recognition 2 years      
2016 Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares)       16,500,000
Number of shares available for grant (in shares) 5,042,238      
2016 Long Term Incentive Plan | Stock option awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Option expiration period 10 years      
2019 Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares)     2,000,000  
Officer and employees | Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Director | Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year