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Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 0.5 $ 0.1   $ 0.2
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (shares)     3,754,228  
Share-based compensation expense     $ 4.0  
Restricted stock units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Restricted stock units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period       4 years
Options granted (shares)       1,920,000
Estimated grant date fair value of options granted       $ 0.4