v3.26.3
Stockholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 05, 2026
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Oct. 24, 2024
Class of Stock [Line Items]                    
Shares retired (in shares) 1,153,846 0       1,153,846        
Repurchased stock purchase price   $ 13,528,000   $ 2,472,000 $ 5,162,000 $ 42,300,000 $ 7,600,000      
Shares acquired, cost (in usd per share)   $ 22.28       $ 24.04 $ 10.41      
Shares withheld (in shares)   11,237 90,408     1,544,075 1,809,314      
Average cost per share (in usd per share)   $ 23.13 $ 21.67     $ 19.90 $ 13.54      
Total cost of shares withheld   $ 300,000 $ 2,000,000.0     $ 30,700,000 $ 24,500,000      
Public Stock Offering                    
Class of Stock [Line Items]                    
Number of units issued (in shares) 10,000,000.0                  
Price per unit (in USD per share) $ 24.96                  
Proceeds from sale of stock $ 0                  
Over-Allotment Option                    
Class of Stock [Line Items]                    
Number of units issued (in shares) 1,500,000                  
Purchase option period 30 days                  
Proceeds from sale of stock $ 28,800,000                  
Common Class A                    
Class of Stock [Line Items]                    
Authorized repurchase amount $ 100,000,000                 $ 50,000,000
Repurchased stock (in shares)   607,147 0     1,760,993 733,019      
RSILP | Owners Other Than Rush Street Interactive                    
Class of Stock [Line Items]                    
Percentage of common units retained by sellers   50.10% 57.55%     50.10% 57.55% 56.46% 60.00%  
Ownership percentage by controlling owners   50.10%       50.10%   56.46%