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Stock Incentive Plans - 2014 Management Incentive Plan Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 07, 2016
Oct. 15, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aggregate fair value (in millions)          
Vesting year 100.00%        
Chief Financial Officer          
Options          
Granted, options (in shares) 280,000        
Management Incentive Plan 2014          
Aggregate fair value (in millions)          
Vesting year   25.00%      
Employee Stock Option | Management Incentive Plan 2014          
Aggregate fair value (in millions)          
Options vested but not exercised (in shares)     12,875 12,875  
Not vested but expected to vest (in shares)     70,000    
Vested and unexercised (in dollars per share)     $ 4.28    
Employee Stock Option | Management Incentive Plan 2014 | Chief Financial Officer          
Options          
Granted, options (in shares) 280,000        
Vested, options (in shares)     (70,000) (70,000) (70,000)
Balance outstanding beginning of period, options (in shares)     140,000 210,000  
Balance outstanding end of period, options (in shares)     70,000 140,000 210,000
Weighted Average Exercise Price          
Granted, exercise price (in dollars per share) $ 4.28   $ 4.28 $ 4.28 $ 4.28
Vested, exercise price (in dollars per share)     (4.28)    
Expiration( years) 5 years        
Risk free interest rate 1.10%        
Volatility 61.00%        
Dividend % 0.00%        
Fair Value of Options on grant date          
Granted, fair value of options on grant date (in dollars per share) $ 1.91   1.91 $ 1.91 $ 1.91
Vested, fair value of options on grant date (in dollars per share)     $ (1.91)    
Aggregate fair value (in millions)          
Granted, aggregate fair value $ 530        
Vested, aggregate fair value     $ (130) $ (130) $ (130)
Balance outstanding beginning of period, aggregate fair value     270 400  
Balance outstanding end of period, aggregate fair value     $ 140 $ 270 $ 400
Expected term 3 years 9 months        
Options vested but not exercised (in shares)     210,000    
Employee Stock Option | Management Incentive Plan 2014 | Chief Financial Officer | Vesting Year 1          
Aggregate fair value (in millions)          
Vesting year 25.00%        
Term 4 years        
Employee Stock Option | Management Incentive Plan 2014 | Chief Financial Officer | Vesting Year 2          
Aggregate fair value (in millions)          
Vesting year 25.00%        
Employee Stock Option | Management Incentive Plan 2014 | Chief Financial Officer | Vesting Year 3          
Aggregate fair value (in millions)          
Vesting year 25.00%        
Employee Stock Option | Management Incentive Plan 2014 | Chief Financial Officer | Vesting Year 4          
Aggregate fair value (in millions)          
Vesting year 25.00%