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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Feb. 16, 2021 | Feb. 09, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Continuation Advances |  |  |  | $ 34,000 | $ 18,000 |  |  |  |
Period in which company must repay continuation advances if change-of-control transaction is entered into with third party |  |  |  |  |  | 2 years |  |  |
Equity or debt financing that must be raised in a single transaction |  |  |  |  |  | $ 100,000 |  |  |
Contingent repayment liability |  | $ 168,574 |  |  |  | 168,574 |  |  |
Gain (loss) from Continuation Advances |  |  |  |  |  | $ (52,000) | $ 34,000 |  |
Continuation Advances paid | $ 52,000 |  |  |  |  |  |  |  |
Sales Revenue, Net [Member] | Gene Company Limited [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  | 17.00% | 18.00% |  |  | 15.00% | 14.00% |  |
Minimum [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input |  | 0.043 |  |  |  | 0.043 |  |  |
Maximum [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input |  | 0.048 |  |  |  | 0.048 |  |  |
Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes | $ 900,000 |  |  |  |  |  |  |  | $ 900,000
Debt instrument, stated interest rate | 1.50% |  |  |  |  |  |  | 1.50% |
Maturity date |  |  |  |  |  | Feb. 15, 2028 |  |  |

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