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Equity-Based Compensation - 2017 and 2018 Plan (Details)
12 Months Ended
May 11, 2018
shares
Dec. 31, 2020
item
shares
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award      
Number of share-based compensation plans | item   3  
2018 Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Unused shares available to be granted (in shares)   1,962,992  
Increase as percentage of outstanding shares 4.00%    
Vesting period 4 years    
2017 Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Additional shares authorized under stock-based plans (in shares) 0    
Vesting period     4 years