Loss Per Share - Schedule of Basic and Diluted Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss	$ (28,346)	$ (52,270)	$ (13,954)	$ (76)	$ (80,616)	$ (14,030)
Net loss attributable to non-controlling interests	(20,014)		(10,187)		(57,587)	(10,246)
Net loss attributable to Rush Street Interactive, Inc. – basic	(8,332)		(3,767)		(23,029)	(3,784)
Effect of dilutive securities:
Warrants, net of amounts attributable to non-controlling interests	0		0		0	(9,569)
Net loss attributable to Rush Street Interactive, Inc. – diluted	$ (8,332)		$ (3,767)		$ (23,029)	$ (13,353)
Denominator:
Weighted Average Common Shares Outstanding - Basic (in shares)	63,976,146		59,163,547		62,889,746	53,093,129
Weighted average effect of dilutive securities:
Public Warrants (in shares)	0		0		0	1,376,624
Private Placement and Working Capital Warrants (in shares)	0		0		0	982,276
Weighted average common shares outstanding - diluted (in shares)	63,976,146		59,163,547		62,889,746	55,452,029
Net loss per Class A common share - basic (in USD per share)	$ (0.13)		$ (0.06)		$ (0.37)	$ (0.07)
Net loss per Class A common share - diluted (in USD per share)	$ (0.13)		$ (0.06)		$ (0.37)	$ (0.24)