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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 12 Months Ended
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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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