Summary of Significant Accounting Policies - Summary of Composition of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Net income	$ 402	$ 439	$ 3,167	$ (2,158)
Basic weighted average common shares outstanding	4,968,089	4,545,297	4,967,780	4,545,297
Net effect of dilutive stock options and warrants	321,913	75,933	289,436
Diluted weighted average common shares outstanding	5,290,002	4,621,230	5,257,216	4,545,297
Net income per common share:
Basic	$ 0.08	$ 0.10	$ 0.64	$ (0.47)
Diluted	$ 0.08	$ 0.09	$ 0.60	$ (0.47)