Loss Per Common Share (Computation Of Basic And Diluted (Loss) Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic loss per common share
Net loss	$ (3,389)	$ (3,138)
Net loss allocated to participating securities	18	23
Net loss allocated to common shareholders	$ (3,371)	$ (3,115)
Basic weighted-average common shares outstanding	39,850	38,738
Basic loss per common share	$ (0.08)	$ (0.08)
Diluted loss per common share
Net loss	$ (3,389)	$ (3,138)
Net loss allocated to participating securities	18	23
Net loss allocated to common shareholders	$ (3,371)	$ (3,115)
Basic weighted-average common shares outstanding	39,850	38,738
Diluted weighted-average common shares outstanding	39,850	38,738
Diluted loss per common share	$ (0.08)	$ (0.08)