SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
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	$ 3,520,150	$ 2,715,422
Total revenues	$ 23,385,998	24,360,685
Regulation Crowdfunding platform fees
Revenue Recognition
Revenue remaining performance obligation expected timing of satisfaction period	12 months
Total revenues	$ 11,115,372	10,278,596
Regulation A commissions
Revenue Recognition
Total revenues	919,825	5,421,047
StartEngine Premium
Revenue Recognition
Total revenues	2,740,337	2,289,999
StartEngine Secure
Revenue Recognition
Total revenues	1,426,320	1,286,483
StartEngine Private
Revenue Recognition
Total revenues	2,709,621
Owners Bonus revenue
Revenue Recognition
Total revenues	4,280,009	4,437,943
Other service revenue
Revenue Recognition
Total revenues	$ 194,514	$ 646,617