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Acquisitions - Supplementary information (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 06, 2020 | Apr. 30, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |
Net cash paid for acquisition |  |  | $ 16,782
Change in fair value of contingent earn-out consideration |  |  | 47
Interwork Group, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid to sellers |  | $ 2,150 |
Contingent earn-out |  | 760 |
Total purchase consideration |  | 2,910 |
Cash acquired in acquisition |  | (1,009) |
Net cash paid for acquisition |  | $ 1,141 |
CDF Group Limited |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid to sellers | $ 24,104 |  |
Cash acquired in acquisition | (8,463) |  |
Net cash paid for acquisition | $ 15,641 |  |
Maximum | Interwork Group, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Increase in fair value of earn-out liability |  |  | $ 100

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