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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic loss per common share
Net loss	$ (4,259)	$ (2,178)	$ (7,648)	$ (5,316)
Net loss allocated to participating securities	21	14	39	36
Net loss allocated to common shareholders	$ (4,238)	$ (2,164)	$ (7,609)	$ (5,280)
Basic weighted-average common shares outstanding (in shares)	40,031	38,943	39,941	38,841
Basic loss per common share (in usd per share)	$ (0.11)	$ (0.06)	$ (0.19)	$ (0.14)
Diluted loss per common share
Net loss	$ (4,259)	$ (2,178)	$ (7,648)	$ (5,316)
Net loss allocated to participating securities	21	14	39	36
Net loss allocated to common shareholders	$ (4,238)	$ (2,164)	$ (7,609)	$ (5,280)
Diluted weighted-average common shares outstanding (in shares)	40,031	38,943	39,941	38,841
Diluted loss per common share (in usd per share)	$ (0.11)	$ (0.06)	$ (0.19)	$ (0.14)