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Summary of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
customer
Dec. 31, 2017
USD ($)
customer
$ / shares
Dec. 31, 2016
USD ($)
Jan. 01, 2018
USD ($)
Oct. 31, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Charge to cost of service and other revenue related to change in estimated useful life of lease instruments   $ 1,600,000      
Charge to cost of service and other revenue related to change in estimated useful life of lease instruments, impact on earnings per share | $ / shares   $ (0.01)      
Fair value assets/liabilities transfer between levels $ 0        
Future cash flows weighted average market yield 9.60% 10.30%      
Investments impariment charges $ 0 $ 0 $ 0    
Long-term restricted cash 4,500,000 4,500,000     $ 4,500,000
Long-lived assets impairment charges 0        
Deferred service revenue 7,400,000        
Deferred service revenue, current 6,537,000 6,319,000      
Deferred service revenue, non-current $ 890,000 1,075,000      
Service period 1 year        
Dividends paid $ 0        
Expected dividend payments $ 0        
Dividend yield 0.00%        
Restricted cash $ 4,500,000 4,500,000 $ 4,500,000    
Prepaid expenses and other current assets $ 2,832,000 $ 2,249,000   $ 2,438,000  
Sales Revenue, Net [Member] | Gene Company Limited [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of individual customers | customer 1 1      
Concentration risk, percentage 26.00% 31.00%      
Accounts Receivable [Member] | Domestic Customers [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage 50.00% 84.00%      
Accounts Receivable [Member] | Gene Company Limited [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of individual customers | customer 1        
Concentration risk, percentage 14.00% 20.00%      
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        
Minimum [Member] | Computer Equipment [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 2 years        
Minimum [Member] | Software [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 3 years        
Minimum [Member] | Furniture and Fixtures [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 3 years        
Minimum [Member] | Lab Equipment [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 3 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        
Maximum [Member] | Computer Equipment [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 3 years        
Maximum [Member] | Software [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 5 years        
Maximum [Member] | Furniture and Fixtures [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 7 years        
Maximum [Member] | Lab Equipment [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 5 years        
Deferred Commission [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Prepaid expenses and other current assets $ 200,000