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Commitments and Contingencies (Narrative) (Details)
3 Months Ended 9 Months Ended
Jun. 22, 2020
item
Jul. 22, 2015
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
May 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
May 01, 2019
USD ($)
Mar. 31, 2019
USD ($)
Oct. 31, 2015
USD ($)
Commitments and Contingencies [Line Items]                      
Long-term restricted cash     $ 3,500,000   $ 3,500,000   $ 3,500,000 $ 4,000,000 $ 4,000,000.0 $ 4,500,000 $ 4,500,000
Rent payments     1,800,000   5,400,000            
Operating lease cost     1,600,000 $ 1,600,000 4,700,000 $ 4,700,000          
Additional liability associated with indemnification obligations     $ 0   $ 0            
1305 O’Brien Drive, Menlo Park, California [Member]                      
Commitments and Contingencies [Line Items]                      
Renewal term     5 years   5 years            
Weighted average remaining lease term     7 years 1 month 6 days   7 years 1 month 6 days            
Weighted average discount rate     7.90%   7.90%            
PacBio IPR Petitions [Member]                      
Commitments and Contingencies [Line Items]                      
Number of petitions | item 2                    
O’Brien Lease Agreement [Member]                      
Commitments and Contingencies [Line Items]                      
Lease term   132 months                  
Rent expense first twelve months   $ 540,000                  
Rent expense last twelve months   $ 711,000                  
Period in which payment must be received without incurring late charge   5 days                  
Late charge, percent   5.00%                  
Amount not paid after written notice, bear interest from date due until date paid, period   10 days                  
O’Brien Lease Agreement [Member] | Prime Rate [Member]                      
Commitments and Contingencies [Line Items]                      
Basis spread on variable rate   2.00%