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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Mar. 18, 2021
Jan. 27, 2021
Feb. 28, 2018
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance-based restricted stock granted (in shares)           553,100    
Weighted average fair value per share (in dollars per share)       $ 5.30   $ 5.30   $ 5.55
Forfeited in period (in shares)           707,879    
Performance Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense       $ 0.7   $ 3.7    
Performance-based restricted stock granted (in shares)           1,099,800    
Weighted average fair value per share (in dollars per share)       $ 8.42   $ 8.42   $ 7.65
Share-based compensation liability related to 2021 PSUs       $ 3.7   $ 3.7    
Forfeited in period (in shares)           227,500    
Performance Stock Units | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Relative total shareholder return, percentage           200.00%    
Performance Stock Units | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Relative total shareholder return, percentage           0.00%    
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)       12,000,000   12,000,000    
Unrecognized compensation expense related to unvested stock       $ 4.6   $ 4.6    
Weighted average remaining vesting period of unrecognized compensation expense           10 months 13 days    
Stock-based compensation expense       1.2 $ 1.2 $ 3.9 $ 4.2  
2014 Plan | Performance Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense       $ 1.7 $ 1.2 $ 6.7 $ 3.5  
Performance-based restricted stock granted (in shares)   1,099,800 252,500          
Risk-free interest rate           0.30%    
Expected volatility (as a percent)           86.00%    
Weighted average fair value per share (in dollars per share)       $ 10.85   $ 10.85    
Forfeited in period (in shares) 227,500              
Percentage of target achievement 200.00%              
Unrecognized compensation expense related to PSU awards       $ 15.3   $ 15.3    
Remaining vesting period of unrecognized compensation expense (in years)           1 year 18 days    
2014 Plan | Performance Stock Units | Class A Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Issuance of shares of class A common stock (in shares) 455,000              
Bold Contribution Agreement | 2014 Plan | Restricted Stock Units | 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