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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Other Commitments [Line Items]    
Sublease income $ 228 $ 910
Unreported loss liability 1,800 1,700
Recoverable insurance amounts 853 693
Property and equipment, net 30,254 $ 31,028
PerClot [Member]    
Other Commitments [Line Items]    
Prepaid royalties 1,500  
Net intangible assets 2,300  
Property and equipment, net 1,300  
Maximum [Member]    
Other Commitments [Line Items]    
Estimated loss $ 3,600  
Starch Technology Purchase [Member]    
Other Commitments [Line Items]    
Term of distribution agreement 15 years  
Expected future contingent payment amounts $ 1,000  
Number of notice days 180 days