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Financial Instruments (Narrative) (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
Financial Instruments [Line Items]        
Fair value of the financing derivative   $ 0   $ 0
Continuation Advances from Illumina $ 34,000,000.0 18,000,000.0 $ 34,000,000 18,000,000
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     $ 100,000,000  
Period in which company must raise equity or debt financing in a single transaction     2 years  
Estimated fair value of the liability   $ 0 $ 0 0
Gain from Continuation Advances from Illumina     34,000,000 $ 18,000,000
Fair value assets/liabilities transfer between levels     $ 0  
Measurement Input, Discount Rate [Member]        
Financial Instruments [Line Items]        
Derivative liability, measurement input | item   0.065   0.065