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ACQUISITIONS - Preliminary Purchase Consideration of the Acquired Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 398,798 | $ 353,639 | $ 349,597
Other long-term liabilities | 11,976 |  |
Celtic |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 8,217 |  |
Inventories | 0 |  |
Prepaid expenses and other current assets | 110 |  |
Property and equipment | 5,437 |  |
Goodwill | 42,315 |  |
Total assets acquired | 103,279 |  |
Accounts payable | 9 |  |
Accrued expenses and other current liabilities | 3,134 |  |
Deferred revenue, current | 3,160 |  |
Net assets acquired | 85,000 |  |
Celtic | Capitalized software |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 12,600 |  |
Celtic | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 33,800 |  |
Celtic | Non-compete agreements |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 200 |  |
Celtic | Trade name |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | $ 600 |  |
2022 Business Combinations |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable |  | 651 |
Settlement assets |  | 685 |
Inventories |  | 0 |
Prepaid expenses and other current assets |  | 83 |
Property and equipment |  | 190 |
Goodwill |  | 61,347 |
Operating lease right-of-use assets |  | 263 |
Other assets |  | 22 |
Total assets acquired |  | 115,671 |
Accrued expenses and other current liabilities |  | 287 |
Settlement obligations |  | 685 |
Deferred revenue, current |  | 30 |
Current portion of operating lease liabilities |  | 82 |
Operating lease liabilities, less current portion |  | 181 |
Other long-term liabilities |  | 6,725 |
Net assets acquired |  | 107,681 |
2022 Business Combinations | Capitalized software |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 9,790 |
2022 Business Combinations | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 41,090 |
2022 Business Combinations | Non-compete agreements |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 0 |
2022 Business Combinations | Trade name |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 1,550 |

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