Computation of Net Loss Per Share of Common Stock (Components of Net Income (Loss) Per Basic and Diluted Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net loss per share – basic
Net loss	$ (1,367)	$ (3,745)	$ (8,629)	$ (12,516)
Weighted average shares outstanding, basic (in shares)	18,143	17,872	18,077	17,358
Net loss per share – basic (in dollars per share)	$ (0.08)	$ (0.21)	$ (0.48)	$ (0.72)
Net loss per share – diluted
Net loss	$ (1,367)	$ (3,745)	$ (8,629)	$ (12,516)
Numerator effect of dilutive securities	0	(43)	0	(1,469)
Loss attributable to common shareholders	$ (1,367)	$ (3,788)	$ (8,629)	$ (13,985)
Weighted average shares outstanding, basic (in shares)	18,143	17,872	18,077	17,358
Denominator effect of dilutive securities
Diluted potential common shares (in shares)	0	9	0	167
Weighted average shares outstanding, diluted (in shares)	18,143	17,881	18,077	17,525
Net loss per share – diluted (in dollars per share)	$ (0.08)	$ (0.21)	$ (0.48)	$ (0.80)
Warrants
Denominator effect of dilutive securities
Warrants (in shares)	0	9	0	167