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GOODWILL AND LONG-LIVED ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 59,980	$ 60,616
Accumulated Amortization	34,170	30,465
Net Carrying Value	25,810	30,151
Merchant relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	19,914	20,208
Accumulated Amortization	11,662	9,236
Net Carrying Value	8,252	10,972
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	9,597	9,651
Accumulated Amortization	8,132	7,921
Net Carrying Value	1,465	1,730
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	538	2,121
Accumulated Amortization	538	1,863
Net Carrying Value	0	258
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	12,225	10,813
Accumulated Amortization	5,462	4,697
Net Carrying Value	6,763	6,116
Other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	17,706	17,823
Accumulated Amortization	8,376	6,748
Net Carrying Value	$ 9,330	$ 11,075

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