Stockholders' Equity - Schedule of Noncontrolling Interests (Details) - RSILP - Owners Other Than Rush Street Interactive |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Noncontrolling Interest [Roll Forward] | ||
| Non-controlling interest ownership percentage at beginning of period | 56.46% | 60.00% |
| Issuance of Class A Common Stock upon RSILP Unit Exchanges | (0.0593) | (0.0183) |
| Issuance of Class A Common Stock in connection with the exercise of stock options | (0.0005) | |
| Non-controlling interest ownership percentage at end of period | 50.10% | 57.55% |
| Common Class A | ||
| Noncontrolling Interest [Roll Forward] | ||
| Issuance of Class A Common Stock and treasury stock under the equity compensation plan, net of shares withheld for employee taxes | (0.0076) | |
| Issuance of Class A Common Stock under the equity compensation plan, net of shares withheld for employee taxes | (0.0080) | |
| Repurchase and retirement of Class A Common Stock | 0.0025 | |
| Repurchase of Class A Common Stock | 0.0013 | 0.0018 |