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GOODWILL AND LONG-LIVED ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 60,670 | $ 60,616
Accumulated Amortization | 31,986 | 30,465
Net Carrying Value | 28,684 | 30,151
Merchant relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 20,378 | 20,208
Accumulated Amortization | 10,187 | 9,236
Net Carrying Value | 10,191 | 10,972
Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 9,671 | 9,651
Accumulated Amortization | 8,009 | 7,921
Net Carrying Value | 1,662 | 1,730
Developed technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1,688 | 2,121
Accumulated Amortization | 1,585 | 1,863
Net Carrying Value | 103 | 258
Patents |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 11,104 | 10,813
Accumulated Amortization | 4,859 | 4,697
Net Carrying Value | 6,245 | 6,116
Other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 17,829 | 17,823
Accumulated Amortization | 7,346 | 6,748
Net Carrying Value | $ 10,483 | $ 11,075

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