Cover Page - shares	9 Months Ended
	Sep. 30, 2024	Oct. 30, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-39232
Entity Registrant Name	Rush Street Interactive, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-3626708
Entity Address, Address Line One	900 N. Michigan Avenue
Entity Address, Address Line Two	Suite 950
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60611
City Area Code	773
Local Phone Number	893-5855
Title of 12(b) Security	Class A common stock, $0.0001 par value per share
Trading Symbol	RSI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Central Index Key	0001793659
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		88,607,034
Class V Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		137,088,928