Computation of Earnings per Share - Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net loss	$ (1,448)	$ (1,060)
Shares outstanding:
Weighted-average common shares outstanding	21,494	21,522
Diluted shares outstanding	21,494	21,522
Net loss per share – basic	$ (0.07)	$ (0.05)
Net loss per share – diluted	$ (0.07)	$ (0.05)