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Acquisitions - Pro Forma Adjustments to Net Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition Pro Forma Information [Line Items] |  |  |  |  |  |
Net income (loss) | $ (51) | $ (102,917) | $ 3,963 | $ (230,779) | $ (179,415) | $ (105,353)
An (increase) in amortization expense related to the fair value of acquired identifiable intangible assets, net of the amortization expense already reflected in actual historical results |  |  |  |  |  |
Business Acquisition Pro Forma Information [Line Items] |  |  |  |  |  |
Net income (loss) | 0 | (5,934) | (7,325) | (42,058) | 23,600 | 62,000
A net increase in revenue related to fair value adjustment |  |  |  |  |  |
Business Acquisition Pro Forma Information [Line Items] |  |  |  |  |  |
Net income (loss) | 682 | 22,542 | 1,219 | 31,584 | 61,900 | 61,900
A decrease (increase) in expenses related to transaction expenses |  |  |  |  |  |
Business Acquisition Pro Forma Information [Line Items] |  |  |  |  |  |
Net income (loss) | 0 | 0 | 14,115 | (2,617) | 8,700 |
An decrease (increase) in interest expense related to new debt financing, net of interest expense related to pre-existing debt settled as part of the acquisitions |  |  |  |  |  |
Business Acquisition Pro Forma Information [Line Items] |  |  |  |  |  |
Net income (loss) | 0 | (2,652) | (2,640) | 97,107 | 106,000 | 147,900
A (decrease) in other income - liability classified warrants |  |  |  |  |  |
Business Acquisition Pro Forma Information [Line Items] |  |  |  |  |  |
Net income (loss) | 0 | 0 | 0 | (1,730) | 1,700 | 9,000
An (increase) in tax provision |  |  |  |  |  |
Business Acquisition Pro Forma Information [Line Items] |  |  |  |  |  |
Net income (loss) | $ (156) | $ (3,201) | $ (1,232) | $ (18,877) | $ 34,700 | $ 3,300

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