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Termination of Merger with Illumina (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jan. 02, 2020
Apr. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Sep. 30, 2020
Termination of Merger with Illumina [Abstract]            
Termination fee received $ 98,000          
Advisor fees paid   $ 6,000        
Continuation Advances     $ 34,000 $ 18,000 $ 52,000 $ 34,000
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