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Subsequent Events - Additional Information (Details) - Revolving Credit Facility - USD ($)
Oct. 12, 2021
Sep. 30, 2021
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2017
Subsequent Event [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 200,000,000      
Senior Secured First Lien Credit Facility          
Subsequent Event [Line Items]          
Line of credit facility, maximum borrowing capacity     $ 200,000,000 $ 100,000,000 $ 100,000,000
Senior Secured First Lien Credit Facility | Subsequent Event          
Subsequent Event [Line Items]          
Line of credit facility, maximum borrowing capacity $ 240,000,000