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Subsequent Event (Narrative) (Details) - shares
12 Months Ended
Feb. 15, 2019
Dec. 31, 2019
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Vesting period 1 year  
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member] | Chief Executive Officer, Michael Hunkapiller, Ph.D. [Member]    
Subsequent Event [Line Items]    
Number of shares, granted 38,750  
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member] | Chief Financial Officer, Susan K. Barnes [Member]    
Subsequent Event [Line Items]    
Number of shares, granted 21,250  
Scenario, Forecast [Member] | Chief Executive Officer, Michael Hunkapiller, Ph.D. [Member]    
Subsequent Event [Line Items]    
Annual target bonus opportunity, percentage of base salary   100.00%
Scenario, Forecast [Member] | Chief Financial Officer, Susan K. Barnes [Member]    
Subsequent Event [Line Items]    
Annual target bonus opportunity, percentage of base salary   65.00%