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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 28, 2010
Jan. 31, 2015
Sep. 30, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Commitments [Line Items]            
Deferred rent obligations       $ 2,457 $ 2,895  
Lease expiration       Dec. 31, 2022    
Total rental expense for operating leases       $ 6,400 4,900 $ 4,300
Sublease income       855 564  
Unreported loss liability       1,700 1,800  
Recoverable insurance amounts       693 692  
Property and equipment, net       31,028 $ 33,579  
PerClot [Member]            
Other Commitments [Line Items]            
Prepaid royalties       1,500    
Net intangible assets       2,300    
Property and equipment, net       $ 1,300    
Performance Stock Awards (PSAs) [Member]            
Other Commitments [Line Items]            
Authorized awards from approved stock incentive plans      
Stock Options [Member]            
Other Commitments [Line Items]            
Grants of stock options       219,000 260,000 387,000
CEO [Member]            
Other Commitments [Line Items]            
Term of employment agreement     3 years      
Maximum [Member]            
Other Commitments [Line Items]            
Estimated loss       $ 3,500    
Starch Technology Purchase [Member]            
Other Commitments [Line Items]            
Term of distribution agreement 15 years          
Amount paid related to achievement of contingent milestone   $ 500        
Expected future contingent payment amounts       $ 1,000