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Termination of Merger with Illumina (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 09, 2021
Mar. 31, 2020
Feb. 28, 2021
Dec. 31, 2021
Dec. 31, 2020
Merger Termination [Line Items]          
(Loss) Gain from Continuation Advances     $ (52,000) $ (52,000) $ 34,000
Possible Continuation Advances payable   $ 52,000      
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      
Illumina, FC Ops Corp [Member]          
Merger Termination [Line Items]          
(Loss) Gain from Continuation Advances   $ 52,000      
Convertible Senior Notes [Member]          
Merger Termination [Line Items]          
Principal amount of notes $ 900,000   $ 900,000    
Debt instrument, stated interest rate 1.50%   1.50%    
Maturity date Feb. 15, 2028   Feb. 15, 2028