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Subsequent Events (Narrative) (Details) - USD ($)
6 Months Ended
Jul. 19, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 31, 2020
Subsequent Events [Line Items]          
Contingent consideration       $ 0 $ 0
Common Stock, shares issued   198,917,000   192,294,000  
Common Stock, par value   $ 0.001   $ 0.001  
Proceeds from issuance of common stock   $ 25,311,000 $ 827,000    
Subsequent Event [Member] | Omniome, Inc. [Member]          
Subsequent Events [Line Items]          
Purchase price $ 600,000,000        
Shares issuable for merger 9,400,000        
Cash required for merger $ 300,000,000        
Contingent consideration 200,000,000        
Subsequent Event [Member] | Omniome, Inc. [Member] | Cash [Member]          
Subsequent Events [Line Items]          
Contingent consideration $ 100,000,000        
Subsequent Event [Member] | Private Placement [Member]          
Subsequent Events [Line Items]          
Common Stock, shares issued 11,214,953        
Price per share $ 26.75        
Proceeds from issuance of common stock $ 300,000,000