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GOODWILL AND ACQUIRED INTANGIBLES - Other Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
 6 Months Ended 9 Months Ended
Jun. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 85,551   $ 92,300
Accumulated Amortization (56,192)   (52,424)
Net 29,359   34,929
Bridge And Dosh Holdings Acquisitions      
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Impaired, Accumulated Impairment Loss     (4,947)
Trade name      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount     2,315
Accumulated Amortization     (1,802)
Net     0
Weighted Average Remaining Useful Life   0 years  
Goodwill, Impaired, Accumulated Impairment Loss     (513)
Developed technology      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 63,621   64,070
Accumulated Amortization (38,305)   (33,838)
Net $ 25,316   29,783
Weighted Average Remaining Useful Life 2 years 9 months 18 days 3 years 4 months 24 days  
Goodwill, Impaired, Accumulated Impairment Loss     (449)
Merchant relationships      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 21,930   25,915
Accumulated Amortization (17,887)   (16,784)
Net $ 4,043   5,146
Weighted Average Remaining Useful Life 1 year 9 months 18 days 2 years 4 months 24 days  
Goodwill, Impaired, Accumulated Impairment Loss     $ (3,985)