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BUSINESS COMBINATION - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Jan. 25, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Business Acquisition [Line Items] |  |  |  |
Contingent consideration in connection with the acquisition |  |  | $ 3,500 | $ 0
Sofdesk |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Voting interests acquired |  | 100.00% |  |
Purchase price |  | $ 31,988 |  |
Contingency payable, maximum |  | 3,700 |  |
Contingent consideration in connection with the acquisition |  | 3,500 |  |
Consideration transferred for business acquisition |  | $ 35,488 |  |
Total acquisition related costs | $ 1,700 |  | 1,700 |
DIN's |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price | 24,800 |  |  |
Total acquisition related costs | $ 1,400 |  | 1,400 |
Timing of monthly installment payments | 1 year |  |  |
DIN's | Additional Consideration, Equal Monthly Installments |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingency payable, maximum | $ 5,000 |  | 5,000 |
Timing of monthly installment payments | 1 year |  |  |
DIN's | Additional Consideration, Payable One Year Anniversary |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingency payable, maximum | $ 5,000 |  | $ 5,000 |

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