GOODWILL AND ACQUIRED INTANGIBLES - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 85,551	$ 85,551	$ 92,300
Accumulated Amortization	(58,977)	(58,977)	(52,424)
Impairment of Intangible Assets		13,748
Net	12,826	12,826	34,929
Bridge And Dosh Holdings Acquisitions
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets			4,947
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			2,315
Accumulated Amortization			(1,802)
Impairment of Intangible Assets			513
Net			$ 0
Weighted Average Remaining Useful Life			0 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	63,621	63,621	$ 64,070
Accumulated Amortization	(40,539)	(40,539)	(33,838)
Impairment of Intangible Assets	13,700	13,748	449
Net	9,334	$ 9,334	$ 29,783
Weighted Average Remaining Useful Life		2 years 9 months 18 days	3 years 4 months 24 days
Merchant relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,930	$ 21,930	$ 25,915
Accumulated Amortization	(18,438)	(18,438)	(16,784)
Impairment of Intangible Assets		0	3,985
Net	$ 3,492	$ 3,492	$ 5,146
Weighted Average Remaining Useful Life		1 year 8 months 12 days	2 years 4 months 24 days