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Termination of Merger with Illumina (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 02, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Termination of Merger with Illumina [Abstract]          
Gain from Continuation Advances   $ 34,000     $ 18,000
Proceeds from Continuation Advances   $ 34,000 $ 18,000 $ 52,000  
Termination fee received $ 98,000        
Period in which company must repay continuation advances if change-of-controll transaction is entered into with third party   2 years      
Equity or debt financing that must be raised in a single transaction   $ 100,000