Calculations for Basic and Diluted Net Income (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss)	$ 389	$ 1,069	$ (4,407)	$ 670
Less: Accretion of Series B preferred stock dividends	(275)	(262)	(818)	(780)
Net income (loss) available to common stockholders	$ 114	$ 807	$ (5,225)	$ (110)
Denominator:
Weighted average common shares outstanding - basic	18,144	17,006	17,868	16,933
Net income (loss) per common share - basic	$ 0.01	$ 0.05	$ (0.29)	$ (0.01)
Dilutive securities:
Stock options, RSUs, and Warrants	506	760
Weighted average common shares outstanding - diluted	18,650	17,766	17,868	16,933
Net income (loss) per common share - diluted	$ 0.01	$ 0.05	$ (0.29)	$ (0.01)
Diluted net income (loss) per common share:
Net income (loss) available to common stockholders	$ 114	$ 807	$ (5,225)	$ (110)
Net income (loss) available to common stockholders	$ 114	$ 807	$ (5,225)	$ (110)