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CUSTOMER ASSETS AND LIABILITIES - Fair Value of Customer Crypto Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Cryptocurrency, by Type [Line Items]
Safeguarding customer crypto assets	$ 114,291,909	$ 75,413,188
Percentage of total	100.00%	100.00%
Safeguarding And Customer Crypto Assets
Cryptocurrency, by Type [Line Items]
Safeguarding customer crypto assets	$ 0	$ 0
Bitcoin
Cryptocurrency, by Type [Line Items]
Safeguarding customer crypto assets	$ 55,700,000	$ 32,500,000
Percentage of total	48.70%	43.10%
Ethereum
Cryptocurrency, by Type [Line Items]
Safeguarding customer crypto assets	$ 29,500,000	$ 20,800,000
Percentage of total	25.80%	27.60%
Other crypto assets
Cryptocurrency, by Type [Line Items]
Safeguarding customer crypto assets	$ 29,100,000	$ 22,100,000
Percentage of total	25.50%	29.30%
Ethereum
Cryptocurrency, by Type [Line Items]
Safeguarding customer crypto assets	$ 7,100,000	$ 3,000,000
No Assets | Safeguarding And Customer Crypto Assets | Asset Concentration Risk
Cryptocurrency, by Type [Line Items]
Concentration risk, percentage (more than)	5.00%	5.00%

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Cryptocurrency, by Type [Line Items]

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Safeguarding Asset, Platform Operator, Crypto-Asset, Percentage Of Total

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- Definition

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
-Section FF
-Subsection Q1
-Publisher SEC

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-21

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-20

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482861/275-10-50-18

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 20
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-URI https://asc.fasb.org//1943274/2147482861/275-10-50-20

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