Computation of Net Loss per Share of Common Stock Components of Net Loss From Continuing Operations Per Basic and Diluted Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding – basic	13,612	10,395	9,499
Net loss	$ (9,200)	$ (6,443)	$ (3,617)
Warrants	(294)	(105)	(161)
Loss attributable to common shareholders	$ (9,494)	$ (6,548)	$ (3,778)
Weighted average shares outstanding – diluted (shares)	13,627	10,414	9,606
Net loss per share – diluted	$ (0.70)	$ (0.63)	$ (0.39)
Net loss per share – basic	$ (0.68)	$ (0.62)	$ (0.38)
Warrants
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Incremental common shares attributable to dilutive effect of call options and warrants	15	19	107