Earnings Per Share - Details of Basic and Diluted Earnings Per 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	$ 161	$ 3,567	$ 3,585	$ 7,051
Dividends paid to preferred stockholders		(52)		(119)
Net income available to common stockholders	$ 161	$ 3,515	$ 3,585	$ 6,932
Denominator:
Weighted average shares outstanding – basic	41,351	36,094	40,656	33,170
Potential common shares – options / warrants (treasury stock method)	1,675	3,378	1,921	2,117
Weighted average shares outstanding – diluted	43,026	39,472	42,577	35,287
Shares excluded (anti-dilutive)	101	67	101	131
Net earnings per common share:
Basic	$ 0.00	$ 0.10	$ 0.09	$ 0.21
Diluted	$ 0.00	$ 0.09	$ 0.08	$ 0.20