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Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
customer
Jun. 30, 2018
customer
Jun. 30, 2019
USD ($)
customer
Jun. 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 8.80%   8.80%     9.60%
Cash, cash equivalents, and investments, excluding restricted cash $ 66,800,000   $ 66,800,000     $ 102,400,000
Net cash used in operating activities, excluding restricted cash     42,900,000      
Operating lease right-of-use assets, net 34,175,000   34,175,000   $ 35,500,000  
Operating lease liability 47,552,000   47,552,000   49,200,000  
Operating lease liabilities, current 3,631,000   3,631,000   3,400,000  
Operating lease liabilities, non-current $ 43,921,000   $ 43,921,000   $ 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 23.00% 33.00% 20.00% 31.00%    
Notes [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Aggregate principal amount $ 16,000,000   $ 16,000,000      
Maturity date     Feb. 29, 2020