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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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