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Stock Incentive Plans - 2016 Equity Compensation Plan Restricted Stock Units Award Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 07, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aggregate fair value (in millions)        
Annual installment amount 100.00%      
Restricted Stock | 2016 Equity Compensation Plan        
Restricted shares *        
Beginning balance (in shares)   1,212,465 1,430,925  
Issued (in shares)   829,390    
Vested (in shares)   (293,011)    
Forfeitures and cancellations (in shares)   (189,342) (537,942)  
Ending balance (in shares)   1,559,502 1,212,465 1,430,925
Fair value on grant date        
Beginning balance (in dollars per share)   $ 4.80 $ 5.70  
Issued, price on grant date (in dollars per share)   4.61    
Vested during period (in dollars per share)   4.92    
Forfeitures and cancellations (in dollars per share)   4,910,000 5.81  
Ending balance (in dollars per share)   $ 4.66 $ 4.80 $ 5.70
Aggregate fair value (in millions)        
Beginning balance, aggregate fair value   $ 5,820 $ 8,150  
Issued, aggregate fair value   3,820    
Vested, aggregate fair value   (1,440)    
Forfeitures and cancellations, aggregate fair value   (930) (3,130)  
Ending balance, aggregate fair value   $ 7,270 $ 5,820 $ 8,150
Term   3 years   3 years
Restricted Stock | 2016 Equity Compensation Plan | Vesting Year 1        
Aggregate fair value (in millions)        
Annual installment amount   33.00%   33.00%
Restricted Stock | 2016 Equity Compensation Plan | Vesting Year 2        
Aggregate fair value (in millions)        
Annual installment amount   33.00%   33.00%
Restricted Stock | 2016 Equity Compensation Plan | Vesting Year 3        
Aggregate fair value (in millions)        
Annual installment amount   33.00%   33.00%
Restricted Stock | 2016 Equity Compensation Plan | January 4, 2018        
Restricted shares *        
Issued (in shares)     948,500  
Fair value on grant date        
Issued, price on grant date (in dollars per share)     $ 4.71  
Aggregate fair value (in millions)        
Issued, aggregate fair value     $ 4,470  
Term     3 years  
Restricted Stock | 2016 Equity Compensation Plan | January 4, 2018 | Vesting Year 1        
Aggregate fair value (in millions)        
Annual installment amount     33.00%  
Restricted Stock | 2016 Equity Compensation Plan | January 4, 2018 | Vesting Year 2        
Aggregate fair value (in millions)        
Annual installment amount     33.00%  
Restricted Stock | 2016 Equity Compensation Plan | January 4, 2018 | Vesting Year 3        
Aggregate fair value (in millions)        
Annual installment amount     33.00%  
Restricted Stock | 2016 Equity Compensation Plan | January 10, 2018        
Restricted shares *        
Issued (in shares)     30,000  
Vested (in shares)     (30,000)  
Fair value on grant date        
Issued, price on grant date (in dollars per share)     $ 4.81  
Vested during period (in dollars per share)     $ 4.81  
Aggregate fair value (in millions)        
Issued, aggregate fair value     $ 100  
Vested, aggregate fair value     $ (100)  
Restricted Stock | 2016 Equity Compensation Plan | March 1, 2018        
Restricted shares *        
Vested (in shares)     (90,711)  
Fair value on grant date        
Vested during period (in dollars per share)     $ 5.47  
Aggregate fair value (in millions)        
Vested, aggregate fair value     $ (500)  
Restricted Stock | 2016 Equity Compensation Plan | September 1, 2018        
Restricted shares *        
Vested (in shares)     (408,143)  
Fair value on grant date        
Vested during period (in dollars per share)     $ 5.90  
Aggregate fair value (in millions)        
Vested, aggregate fair value     $ (2,410)  
Restricted Stock | 2016 Equity Compensation Plan | October 14, 2018        
Restricted shares *        
Vested (in shares)     (130,164)  
Fair value on grant date        
Vested during period (in dollars per share)     $ 5.90  
Aggregate fair value (in millions)        
Vested, aggregate fair value     $ (770)