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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net loss per share – basic
Net loss	$ (2,622)	$ (4,321)	$ (7,262)	$ (8,771)
Weighted average number of shares outstanding, basic (in shares)	18,072	17,741	18,042	17,096
Net loss per share – basic (in dollars per share)	$ (0.15)	$ (0.24)	$ (0.40)	$ (0.51)
Net income (loss) per share – diluted
Net loss	$ (2,622)	$ (4,321)	$ (7,262)	$ (8,771)
Numerator effect of dilutive securities	0	(1,018)	0	(1,375)
Net loss available to common stockholders, diluted	$ (2,622)	$ (5,339)	$ (7,262)	$ (10,146)
Weighted average number of shares outstanding, basic (in shares)	18,072	17,741	18,042	17,096
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Weighted average number diluted shares outstanding adjustment	0	158	0	203
Weighted average number of shares outstanding, diluted (in shares)	18,072	17,899	18,042	17,299
Net loss per share – diluted (in dollars per share)	$ (0.15)	$ (0.30)	$ (0.40)	$ (0.59)
Warrants
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental common shares attributable to dilutive effect of call options and warrants (in shares)	0	158	0	203