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Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
customer
Sep. 30, 2017
USD ($)
customer
Sep. 30, 2018
USD ($)
customer
Sep. 30, 2017
USD ($)
customer
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Fair value assets liabilities transfer between levels     $ 0      
Future cash flows weighted average market yield 9.20%   9.20%     10.30%
Cash, cash equivalents, and investments, excluding restricted cash $ 115,700,000   $ 115,700,000     $ 62,900,000
Prepaid expenses and other current assets 2,028,000   2,028,000   $ 2,438,000 2,249,000
Deferred service revenue 6,700,000   6,700,000      
Deferred service revenue, current 5,740,000   5,740,000     6,319,000
Deferred service revenue, non-current 1,016,000   1,016,000     $ 1,075,000
Deferred contractual revenue 5,500,000   $ 5,500,000      
Service period     1 year      
Restricted cash 4,500,000 $ 4,500,000 $ 4,500,000 $ 4,500,000    
Deferred Commission [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Prepaid expenses and other current assets $ 200,000   $ 200,000      
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 20.00% 35.00% 28.00% 30.00%    
Minimum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Deferred service revenue, performance period     1 year      
Deferred service revenue, non-current, recognition period     2 years      
Maximum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Deferred service revenue, performance period     3 years      
Deferred service revenue, non-current, recognition period     5 years