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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) segment item customer	Dec. 31, 2020 item customer	Dec. 31, 2019 item customer
Summary of Significant Accounting Policies
Number of reportable segments | segment	5
Goodwill impairment from annual impairment test	$ 0.0
Intangible assets impairment loss	$ 0.0
Options to renew	true
Option to terminate period	1 year
Minimum
Summary of Significant Accounting Policies
Useful life (in years)	3 years
Renewal term	1 year
Maximum
Summary of Significant Accounting Policies
Useful life (in years)	7 years
Renewal term	5 years
Option to terminate period	1 year
Transaction fees | Customer Risk
Summary of Significant Accounting Policies
Number of members | item	2	2	2
Revenue | Customer Risk | Major Customer
Summary of Significant Accounting Policies
Number of members | customer	0	0	0
Concentration risk (as a percent)	13.00%	13.00%	13.00%

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized based on the annual impairment test.

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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.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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