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Stockholders' Equity And Stock-Based Compensation Expense (Common Stock Outstanding And Stockholders' Equity) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Common Stock, Beginning balance   40,016,792     40,016,792  
Common Stock, Ending balance 40,097,917       40,097,917  
Stockholders' equity, Stock-based compensation for:         $ 980 $ 665
Stockholders' equity, Exercise of stock options $ 119 $ 211 $ 3 $ 692    
Stockholders' equity, Proceeds from registered direct offering of common stock         189,825
Net loss $ (19,328) $ (17,527) $ (5,125) $ (3,526) $ (36,855) $ (8,651)
Stock Option [Member]            
Common Stock, Exercise of stock options 155,915       175,524