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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019 | Feb. 16, 2021 | Feb. 09, 2021 | Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Continuation Advances |  |  |  | $ 34,000,000.0 | $ 18,000,000.0 |  |  |  |  |  |
Period in which company must repay continuation advances if change-of-control transaction is entered into with third party |  |  |  | 2 years |  | 2 years |  |  |  |  |
Equity or debt financing that must be raised in a single transaction |  |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  |  |
Period in which company must raise equity or debt financing in a single transaction |  |  |  | 2 years |  |  |  |  |  |  |
Contingent repayment liability |  |  |  | $ 0 |  |  |  |  |  |  | $ 0
Gain (loss) from Continuation Advances |  |  |  | $ 34,000,000.0 |  | (52,000,000) | $ 34,000,000 | $ 18,000,000.0 |  |  |
Continuation Advances paid | $ 52,000,000.0 |  |  |  |  |  |  |  |  |  |
Fair value assets/liabilities transfer between levels |  |  |  |  |  | $ 0 |  |  |  |  |
Sales Revenue, Net [Member] | Gene Company Limited [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  | 17.00% | 15.00% |  |  | 14.00% | 11.00% |  |  |  |
Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes | $ 900,000,000 |  |  |  |  |  |  |  |  | $ 900,000,000 |
Debt instrument, stated interest rate | 1.50% |  |  |  |  |  |  |  | 1.50% |  |
Maturity date |  |  |  |  |  | Feb. 15, 2028 |  |  |  |  |

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