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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Concentration Risk [Line Items]
USDC held	$ 400,799	$ 400,799	$ 861,149
Safeguarding customer crypto assets	114,291,909	114,291,909	75,413,188
Safeguarding customer crypto liabilities	$ 114,291,909	$ 114,291,909	$ 75,413,188
Accounts Receivable | Customer Concentration Risk | One Customer
Concentration Risk [Line Items]
Concentration risk, percentage (more than)			10.00%
Accounts Receivable | Customer Concentration Risk | Two Customers
Concentration Risk [Line Items]
Concentration risk, percentage (more than)		10.00%
Revenue Benchmark | Customer Concentration Risk | One Customer
Concentration Risk [Line Items]
Concentration risk, percentage (more than)	10.00%	10.00%

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Fair value of asset to safeguard crypto-asset held for platform user.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
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-Publisher SEC

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-Topic 954
-SubTopic 310
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