SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Revenue Recognition
Membership fee			$ 275
Percentage of bonus shares that the members are entitled			10.00%
Revenue, Practical Expedient, Financing Component [true false]			false
Term of contract with customers			1 year
Deferred revenue	$ 2,752,682		$ 2,752,682		$ 3,520,150
Total revenues	9,578,992	$ 5,701,917	31,203,200	$ 15,660,161
Change	3,877,075		15,543,039
Cost of revenues	5,411,753	1,715,915	$ 16,352,935	4,623,131
Regulation Crowdfunding platform fees
Revenue Recognition
Revenue remaining performance obligation expected timing of satisfaction period			12 months
Total revenues	1,477,360	3,169,997	$ 6,738,697	8,371,641
Change	(1,692,637)		(1,632,944)
Regulation A commissions
Revenue Recognition
Total revenues	802,539	255,403	1,320,146	951,947
Change	547,136		368,199
StartEngine Premium
Revenue Recognition
Total revenues	504,500	739,380	1,488,000	2,238,625
Change	(234,880)		(750,625)
StartEngine Secure
Revenue Recognition
Total revenues	379,320	428,772	917,708	1,182,067
Change	(49,452)		(264,359)
StartEngine Private
Revenue Recognition
Total revenues	5,011,080		16,496,643
Change	5,011,080		16,496,643
Cost of revenues	3,165,399	0	10,639,064
Venture Club (formerly OWNers Bonus) revenue
Revenue Recognition
Total revenues	1,328,000	1,067,649	4,050,919	2,751,322
Change	260,351		1,299,597
Other service revenue
Revenue Recognition
Total revenues	76,193	$ 40,716	191,087	$ 164,559
Change	$ 35,477		$ 26,528