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Termination of Merger with Illumina (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 02, 2020
Feb. 28, 2021
Apr. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Feb. 16, 2021
Feb. 09, 2021
Merger Termination [Line Items]                        
Continuation Advances             $ 34,000 $ 18,000        
Gain (loss) from Continuation Advances                 $ (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      
Continuation Advances paid   $ 52,000                    
Termination fee received $ 98,000                      
Advisor fees paid     $ 6,000                  
Other income (expense), net       $ (133) $ 98,000 $ 467     $ 92 $ 1,143    
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