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Stock Incentive Plans - Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 07, 2016
Oct. 15, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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          
Options          
Vested and unexercised (in shares)     (12,875) (9,960)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Vested and unexercised (in dollars per share)     $ 4.28    
Employee Stock Option | Management Incentive Plan 2014 | Chief Financial Officer          
Options          
Balance outstanding beginning of period, options (in shares)     210,000    
Granted, options (in shares) 280,000        
Vested, options (in shares)     (70,000) (70,000)  
Vested and unexercised (in shares)     (140,000)    
Balance outstanding end of period, options (in shares)     140,000 210,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Granted, exercise price (in dollars per share) $ 4.28   $ 4.28 $ 4.28  
Expiration 5 years        
Risk free interest rate 1.10%        
Volatility 61.00%        
Dividend % 0.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Granted, fair value of options on grant date (in dollars per share) $ 1.91   $ 1.91 $ 1.91  
Aggregate fair value (in millions)          
Balance outstanding beginning of period, aggregate fair value     $ 400    
Granted, aggregate fair value $ 530        
Vested, aggregate fair value     (130) $ (130)  
Balance outstanding end of period, aggregate fair value     $ 270 $ 400  
Expected Term 3 years 9 months        
Term 4 years        
Employee Stock Option | Management Incentive Plan 2014 | Vesting Year 1 | Chief Financial Officer          
Aggregate fair value (in millions)          
Vesting Year 25.00%        
Employee Stock Option | Management Incentive Plan 2014 | Vesting Year 2 | Chief Financial Officer          
Aggregate fair value (in millions)          
Vesting Year 25.00%        
Employee Stock Option | Management Incentive Plan 2014 | Vesting Year 3 | Chief Financial Officer          
Aggregate fair value (in millions)          
Vesting Year 25.00%        
Employee Stock Option | Management Incentive Plan 2014 | Vesting Year 4 | Chief Financial Officer          
Aggregate fair value (in millions)          
Vesting Year 25.00%        
Employee Stock Option | 2016 Equity Compensation Plan          
Options          
Balance outstanding beginning of period, options (in shares)     1,180,086 1,656,171  
Vested, options (in shares)       (828,085)  
Vested and unexercised (in shares)     (525,501) (828,085)  
Forfeited, options (in shares)     (1,875) (3,000)  
Exercised, options (in shares)     (875)    
Balance outstanding end of period, options (in shares)     651,835 1,180,086 1,656,171
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Exercise Price (in dollars per share)     $ 4.65 $ 4.28  
Vested (in dollars per share)       4.28  
Vested and unexercised (in dollars per share)     4.55    
Forfeitures exercise price (in dollars per share)     5.56 5.56  
Exercised (in dollars per share)     5.56    
Exercise Price (in dollars per share)     4.72 4.65 $ 4.28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Fair Value of Options on Grant Date (in dollars per share)     2.91    
Vested, fair value of options on grant date (in dollars per share)       3.12  
Vested and unexercised, fair value (in dollars per share)     3.01    
Forfeitures, fair value of options on grant date (in dollars per share)     2.60 2.60  
Exercised, fair value of options on grant date (in dollars per share)     $ 2.60    
Fair Value of Options on Grant Date (in dollars per share)       $ 2.91  
Aggregate fair value (in millions)          
Balance outstanding beginning of period, aggregate fair value     $ 3,430 $ 5,170  
Forfeited, aggregate fair value     (50) (80)  
Vested and unexercised, aggregate fair value     (1,600)    
Vested, aggregate fair value       (2,600)  
Exercised, aggregate fair value     (30)    
Balance outstanding end of period, aggregate fair value     $ 3,010 $ 3,430 $ 5,170
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 1          
Options          
Granted, options (in shares)         1,266,476
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Granted, exercise price (in dollars per share)         $ 4.28
Expiration         5 years
Risk free interest rate         1.79%
Volatility         62.00%
Dividend %         0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Granted, fair value of options on grant date (in dollars per share)         $ 3.12
Aggregate fair value (in millions)          
Granted, aggregate fair value         $ 3,960
Expected Term       3 years 1 month 24 days  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 1 | Vesting Year 1          
Aggregate fair value (in millions)          
Vesting Year       25.00%  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 1 | Vesting Year 2          
Aggregate fair value (in millions)          
Vesting Year       25.00%  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 1 | Vesting Year 3          
Aggregate fair value (in millions)          
Vesting Year       25.00%  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 1 | Vesting Year 4          
Aggregate fair value (in millions)          
Vesting Year       25.00%  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 2          
Options          
Granted, options (in shares)         389,695
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Granted, exercise price (in dollars per share)         $ 4.28
Expiration         5 years
Risk free interest rate         1.79%
Volatility         62.00%
Dividend %         0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Granted, fair value of options on grant date (in dollars per share)         $ 3.14
Aggregate fair value (in millions)          
Granted, aggregate fair value         $ 1,210
Expected Term       3 years 1 month 24 days  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 2 | Vesting Year 1          
Aggregate fair value (in millions)          
Vesting Year       25.00%  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 2 | Vesting Year 2          
Aggregate fair value (in millions)          
Vesting Year       25.00%  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 2 | Vesting Year 3          
Aggregate fair value (in millions)          
Vesting Year       25.00%  
Employee Stock Option | 2016 Equity Compensation Plan | December 15, 2016, Group 2 | Vesting Year 4          
Aggregate fair value (in millions)          
Vesting Year       25.00%  
Employee Stock Option | 2016 Equity Compensation Plan | March 1, 2017          
Options          
Issued, options (in shares)       337,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Issued, exercise price (in dollars per share)       $ 5.56  
Expiration       5 years  
Risk free interest rate       1.72%  
Volatility       63.50%  
Dividend %       0.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Issued, fair value of options on grant date (in dollars per share)       $ 2.60  
Aggregate fair value (in millions)          
Issued, aggregate fair value       $ 900  
Expected Term     3 years 9 months    
Vesting Year     25.00%    
Term     4 years    
Employee Stock Option | 2016 Equity Compensation Plan | June 1, 2017          
Options          
Issued, options (in shares)       18,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Issued, exercise price (in dollars per share)       $ 4.71  
Expiration       5 years  
Risk free interest rate       1.56%  
Volatility       64.70%  
Dividend %       0.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Issued, fair value of options on grant date (in dollars per share)       $ 2.23  
Aggregate fair value (in millions)          
Issued, aggregate fair value       $ 40  
Expected Term     3 years 9 months    
Vesting Year     25.00%    
Term     4 years