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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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