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Business Combinations - Revenue and Net Loss Recognized (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Decision Resources Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues, net | $ 51,626 | $ 49,499 | $ 150,911 | $ 113,206
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | 7,868 | (454) | 18,275 | (9,971)
Deferred revenue haircut |  | $ 2,017 |  | $ 6,822
CPA Global |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues, net | 155,869 |  | 465,073 |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | 18,357 |  | 5,372 |
Deferred revenue haircut | $ (50) |  | $ (4,399) |

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