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Summary of Significant Accounting Policies - Other Information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 5,368,526 | $ 3,547,400 |  |  |  |  |  |  |
Impact of adoption of standard on Accumulated deficit | (10,892,408) | (9,034,790) | $ (11,161,476) | $ (9,118,597) | $ (2,022,313) | $ (2,191,354) | $ (1,925,681) |  | $ (1,248,599)
Acquisition | 31,926 | 4,501,894 |  |  |  |  |  |  |
Science Segment |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |
Acquisition | 11,297 | 499,199 |  |  |  |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | 0 |  |  |  |  |  |  |
Accumulated Deficit |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |
Impact of adoption of standard on Accumulated deficit | 1,432,363 | 1,250,838 | $ 1,438,356 | $ 1,306,789 | $ 1,237,113 | $ 1,055,127 | $ 1,029,846 |  | $ 890,894
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |
Impact of adoption of standard on Accumulated deficit |  |  |  |  |  |  |  | $ 10,097 |
Term Loan Facility |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 2,825,950 | $ 2,847,400 |  |  |  |  |  |  |

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