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Stock Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued (in shares)   30,900,000      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding, unvested restricted stock (in shares)   1,603,766 837,123 507,536 422,928
Non-cash compensation expense   $ 3.8 $ 2.2 $ 1.3  
Forfeitures (in shares)   0 1,575 5,120  
Unrecognized compensation expense   $ 5.9 $ 3.1    
Weighted average period to recognize the unrecognized compensation expense   1 year 9 months 18 days      
Fair value of shares vested   $ 1.8 $ 1.3 $ 1.1  
Requisite service period   3 years      
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding, unvested restricted stock (in shares)   2,902,014 2,018,518 842,792 0
Award vesting period   3 years      
Expected term for expected volatility rate   3 years      
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding, unvested restricted stock (in shares)   441,746 0    
Non-cash compensation expense   $ 0.9      
Unrecognized compensation expense   $ 1.8      
Weighted average period to recognize the unrecognized compensation expense   2 years      
Requisite service period   3 years      
2017 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Additional shares authorized (In shares) 7,600,000        
Maximum shares issuable (in shares)   13,170,000      
Common shares reserved for issuance (in shares)   5,540,536 9,053,166    
2017 Plan | Non-employee director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued (in shares)     228,750    
2017 Plan | Non-employee director | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued (in shares)   507,821      
2017 Plan | Employee | Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued (in shares)   1,881,380      
2017 Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding, unvested restricted stock (in shares)   1,603,766 755,286    
2017 Plan | Restricted Stock | Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued (in shares)     827,126    
2017 Plan | Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common shares reserved for issuance (in shares)   4,798,517 3,060,958    
Non-cash compensation expense   $ 5.0 $ 2.9 $ 0.9  
Unrecognized compensation expense   $ 5.7 $ 4.5 $ 2.6  
Weighted average period to recognize the unrecognized compensation expense   1 year 8 months 12 days      
Award vesting period   3 years      
Fair value assumptions, expected term   3 years      
2017 Plan | Performance Shares | Relative TSR performance Is Less than the 30th percentile          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights (as a percent)   0.00%      
2017 Plan | Performance Shares | Relative TSR performance Is equal to the 50th percentile          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights (as a percent)   100.00%      
2017 Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common shares reserved for issuance (in shares)   441,746      
2010 Stock Incentive Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding, unvested restricted stock (in shares)   0