Summary of Significant Accounting Policies - Summary of Composition of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Net (loss) income	$ (2,797)	$ 1,052	$ (499)	$ 3,239
Basic weighted average common shares outstanding	6,274,250	5,691,686	5,888,008	5,691,686
Net effect of dilutive stock options and warrants	0	0	0	0
Diluted weighted average common shares outstanding	6,274,250	5,691,686	5,888,008	5,691,686
Net income per common share:
Basic	$ (0.45)	$ 0.18	$ (0.08)	$ 0.57
Diluted	$ (0.45)	$ 0.18	$ (0.08)	$ 0.57