Fair Value Of Financial Instruments (Fair Value Of Financial Assets Measured On A Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
ASSETS
Total assets measured at fair value	$ 7,675	$ 23,675
Money Market Funds [Member]
ASSETS
Total cash and cash equivalents	2,675	23,675
US Treasury Securities [Member]
ASSETS
Total cash and cash equivalents	5,000
Level 1 [Member]
ASSETS
Total assets measured at fair value	2,675	23,675
Level 1 [Member] | Money Market Funds [Member]
ASSETS
Total cash and cash equivalents	2,675	$ 23,675
Level 2 [Member]
ASSETS
Total assets measured at fair value	5,000
Level 2 [Member] | US Treasury Securities [Member]
ASSETS
Total cash and cash equivalents	$ 5,000