Calculations for Basic Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss	$ (5,105)	$ (1,151)
Accretion of Series B convertible preferred stock dividends	(1,094)	(1,042)
Numerator for basic net loss per share - net loss available to common stockholders	$ (6,199)	$ (2,193)
Denominator:
Weighted average common shares outstanding - basic	17,978	16,984
Net loss per common share - basic	$ (0.34)	$ (0.13)