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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 28, 2010
Jan. 31, 2015
Sep. 30, 2014
Jun. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Commitments [Line Items]              
Deferred rent obligations         $ 2,895 $ 2,355  
Lease expiration         Dec. 31, 2022    
Total rental expense for operating leases         $ 4,900 4,300 $ 3,400
Unreported loss liability         1,800 1,500  
Recoverable insurance amounts         692 626  
Property and equipment, net         33,579 $ 18,502  
PerClot [Member]              
Other Commitments [Line Items]              
Prepaid royalties         1,500    
Net intangible assets         2,600    
Property and equipment, net         $ 1,400    
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         260,000 387,000 328,000
CEO [Member]              
Other Commitments [Line Items]              
Term of employment agreement     3 years        
Chair Of Board Of Directors [Member]              
Other Commitments [Line Items]              
Severance payment       $ 1,400      
Remaining severance obligations         $ 77 $ 83  
Maximum [Member]              
Other Commitments [Line Items]              
Estimated loss         2,900    
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