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Fair Value Of Financial Instruments (Fair Value Of Financial Assets Measured On A Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
ASSETS    
Total assets measured at fair value $ 44,279 $ 17,192
Cash And Cash Equivalents [Member] | Money Market Funds [Member]    
ASSETS    
Total cash and cash equivalents 44,279 7,176
Cash And Cash Equivalents [Member] | U.S. Treasury Securities [Member]    
ASSETS    
Total cash and cash equivalents   2,004
Investments [Member] | U.S. Treasury Securities [Member]    
ASSETS    
Total investments   8,012
Level 1 [Member]    
ASSETS    
Total assets measured at fair value 44,279 7,176
Level 1 [Member] | Cash And Cash Equivalents [Member] | Money Market Funds [Member]    
ASSETS    
Total cash and cash equivalents $ 44,279 7,176
Level 2 [Member]    
ASSETS    
Total assets measured at fair value   10,016
Level 2 [Member] | Cash And Cash Equivalents [Member] | U.S. Treasury Securities [Member]    
ASSETS    
Total cash and cash equivalents   2,004
Level 2 [Member] | Investments [Member] | U.S. Treasury Securities [Member]    
ASSETS    
Total investments   $ 8,012