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Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
customer
Sep. 30, 2018
customer
Sep. 30, 2019
USD ($)
customer
Sep. 30, 2018
customer
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Fair value assets/liabilities transfer between levels $ 0          
Future cash flows weighted average market yield 7.70%   7.70%     9.60%
Cash, cash equivalents, and investments, excluding restricted cash $ 49,200,000   $ 49,200,000     $ 102,400,000
Net cash used in operating activities, excluding restricted cash     60,100,000      
Operating lease right-of-use assets, net 33,510,000   33,510,000   $ 35,500,000  
Operating lease liability 46,692,000   46,692,000   49,200,000  
Operating lease liabilities, current 3,724,000   3,724,000   3,400,000  
Operating lease liabilities, non-current $ 42,968,000   $ 42,968,000   $ 45,800,000  
Gene Company Limited [Member] | Sales Revenue, Net [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of individual customers | customer 1 1 1 1    
Concentration risk, percentage 18.00% 20.00% 14.00% 28.00%    
Notes [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Aggregate principal amount $ 16,000,000   $ 16,000,000      
Maturity date     Feb. 29, 2020