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Summary Of Significant Accounting Policies (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
customer
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 01, 2017
USD ($)
Oct. 31, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Cost to cost of service and other revenue related to change in estimated useful life of lease instruments $ 1,600,000        
Cost 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 10.30% 10.60%      
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 tax assets 251,425,000 317,484,000   $ 321,500,000  
Cash, cash equivalents and investments $ 62,900,000 $ 72,000,000      
Sales Revenue, Net [Member] | Gene Company Limited [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage 31.00%        
Number of individual customers | customer 1        
Accounts Receivable [Member] | Domestic Customers [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage 84.00% 84.00%      
Accounts Receivable [Member] | Gene Company Limited [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage 20.00%        
Number of individual customers | customer 1        
Building [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life 30 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] | 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        
Federal [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Excluded windfall tax deductions   $ 6,000,000      
State [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Excluded windfall tax deductions   $ 600,000