Calculations for Basic Net Loss Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net loss	$ (2,719)	$ (999)
Less: accretion of Series B convertible preferred stock dividends	(313)	(298)
Net loss available to common stockholders	$ (3,032)	$ (1,297)
Denominator:
Weighted average common shares outstanding - basic	22,794	22,574
Net loss per common share - basic	$ (0.13)	$ (0.06)