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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jan. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance-based restricted stock granted (in shares)       568,900    
Weighted average fair value per share (in dollars per share)   $ 5.91   $ 5.91   $ 6.60
Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance-based restricted stock granted (in shares)       1,043,800    
Weighted average fair value per share (in dollars per share)   $ 7.65   $ 7.65   $ 10.51
2014 Plan | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized to be issued under the plan (in shares)   9,400,000   9,400,000    
Unrecognized compensation expense related to unvested stock   $ 6.7   $ 6.7    
Weighted average remaining vesting period of unrecognized compensation expense       11 months 8 days    
Stock-based compensation expense   1.3 $ 1.5 $ 3.0 $ 3.0  
2014 Plan | Restricted Stock Units | Bold Contribution Agreement | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares of common stock that each holder has contingent right to receive (in shares)       1    
2014 Plan | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 1.3 $ 0.8 $ 2.3 $ 1.4  
Performance-based restricted stock granted (in shares) 1,043,800          
Risk-free interest rate       1.40%    
Expected volatility (as a percent)       62.00%    
Weighted average fair value per share (in dollars per share)   $ 5.36   $ 5.36    
Unrecognized compensation expense related to PSU awards   $ 8.5   $ 8.5    
Remaining vesting period of unrecognized compensation expense (in years)       1 year 29 days    
Minimum | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Relative total shareholder return, percentage 0.00%          
Relative total shareholder return, cash issued, percentage 100.00%          
Maximum | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Relative total shareholder return, percentage 200.00%