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Acquisition (Details) £ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 06, 2020 USD ($) | Nov. 06, 2020 GBP (£) | Apr. 30, 2020 USD ($) | Apr. 30, 2020 CAD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Apr. 30, 2020 CAD ($)
Acquisition of CDF Group Limited |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  | $ 0 | $ 344,000 | $ 0 | $ 982,000 |
Interwork Group, Inc. |  |  |  |  |  |  |  |  |
Acquisition of CDF Group Limited |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  | $ 3,600,000 | $ 5.0 |  |  |  |  |
Potential earn-out |  |  | $ 800,000 |  |  |  |  |  | $ 1.1
Earn-out liability paid |  |  |  |  | $ 900,000 |  |  |  |
CDF Group Limited |  |  |  |  |  |  |  |  |
Acquisition of CDF Group Limited |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 17,400,000 | £ 13.3 |  |  |  |  |  |  |

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