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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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