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GOODWILL AND LONG-LIVED ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 60,215 | $ 60,616
Accumulated Amortization | 32,687 | 30,465
Net Carrying Value | 27,528 | 30,151
Merchant relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 20,498 | 20,208
Accumulated Amortization | 11,125 | 9,236
Net Carrying Value | 9,373 | 10,972
Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 9,687 | 9,651
Accumulated Amortization | 8,097 | 7,921
Net Carrying Value | 1,590 | 1,730
Developed technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 554 | 2,121
Accumulated Amortization | 554 | 1,863
Net Carrying Value | 0 | 258
Patents |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 11,752 | 10,813
Accumulated Amortization | 5,091 | 4,697
Net Carrying Value | 6,661 | 6,116
Other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 17,724 | 17,823
Accumulated Amortization | 7,820 | 6,748
Net Carrying Value | $ 9,904 | $ 11,075

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