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ACQUISITIONS - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) business | Jul. 31, 2020 USD ($) | Jan. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent purchase obligation | $ 3,880 |  |  | $ 3,880 |  | $ 0
2020 Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  |  |  | 11,853 |  |
July 2020 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 4,250 |  |  |  |
Contingent purchase obligation | 3,880 |  |  | 3,880 | $ 2,745 |
December 2020 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 8,212 |  |  |  |  |
Number of businesses acquired | business | 2 |  |  |  |  |
Payments to acquire business | $ 7,365 |  |  |  |  |
Promissory note | $ 847 |  |  |  |  |
January 2020 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Asset acquisition, purchase price |  |  | $ 2,153 |  |  |
Cash payments for asset acquisition |  |  | 1,724 |  |  |
Custodial hold back |  |  | 99 |  |  |
Promissory note |  |  | $ 330 |  |  |
Customer Relationships | 2020 Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  |  |  | 9,753 |  |
Developed Technology | 2020 Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  |  |  | 2,000 |  |
Trade Names | 2020 Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  |  |  | $ 100 |  |

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