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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Other Commitments [Line Items]    
Deferred rent obligations $ 3,036 $ 2,355
Unreported loss liability 1,500 1,500
Recoverable insurance amounts 656 626
Property and equipment, net 20,192 18,502
PerClot [Member]    
Other Commitments [Line Items]    
Prepaid royalties 1,500  
Net intangible assets 2,800  
Property and equipment, net 1,200  
CEO [Member]    
Other Commitments [Line Items]    
Incremental expense related to agreement 83 $ 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  
Expected future contingent payment amounts to be initially recorded as research and development expense $ 1,000  
Number of notice days 180 days