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Research Grants And Agreements (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development expense $ 26,444 $ 24,961 $ 17,253
Sponsored Research Agreement ("SRA") [Member]      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development expense $ 600 $ 900 $ 700
ODURF [Member]      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Period of time for Sponsored Research Agreement ("SRA") 12 months    
ODURF [Member] | Sponsored Research Agreement ("SRA") [Member]      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development expense $ 800