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Termination of Merger with Illumina (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 20, 2020
Jan. 02, 2020
Mar. 31, 2020
Feb. 29, 2020
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2019
Mar. 02, 2020
Feb. 03, 2020
Dec. 02, 2019
Nov. 01, 2019
Oct. 01, 2019
Merger Termination [Line Items]                        
Continuation Advances due for merger                   $ 6,000 $ 6,000 $ 6,000
Gain from Continuation Advances from Illumina           $ 18,000 $ 18,000          
Continuation Advances from Illumina           $ 18,000 $ 18,000          
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          
Forecast [Member]                        
Merger Termination [Line Items]                        
Continuation Advances due for merger               $ 6,000        
Continuation Advances from Illumina     $ 6,000 $ 22,000                
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                      
Subsequent Event [Member]                        
Merger Termination [Line Items]                        
Continuation Advances due for merger   $ 6,000             $ 22,000      
Continuation Advances from Illumina         $ 6,000              
Termination fee received   98,000                    
Advisor fee payable   $ 10,000