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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net loss per share – basic
Net loss	$ (4,321)	$ (692)	$ (8,771)	$ (3,364)
Weighted average number of shares outstanding, basic (in shares)	17,741	13,534	17,096	13,543
Net loss per share – basic (in dollars per share)	$ (0.24)	$ (0.05)	$ (0.51)	$ (0.25)
Net income (loss) per share – diluted
Net loss	$ (4,321)	$ (692)	$ (8,771)	$ (3,364)
Numerator effect of dilutive securities	(1,018)	(128)	(1,375)	(294)
Net loss available to common stockholders, diluted	$ (5,339)	$ (820)	$ (10,146)	$ (3,658)
Weighted average number of shares outstanding, basic (in shares)	17,741	13,534	17,096	13,543
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Weighted average number diluted shares outstanding adjustment	158	4	203	30
Weighted average number of shares outstanding, diluted (in shares)	17,899	13,538	17,299	13,573
Net loss per share – diluted (in dollars per share)	$ (0.30)	$ (0.06)	$ (0.59)	$ (0.27)
Warrants
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental common shares attributable to dilutive effect of call options and warrants (in shares)	158	4	203	30