Earnings Per Share - Schedule of Computation of Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 647	$ 6,314	$ 1,648	$ 209
Weighted-average shares outstanding:
Weighted-average common stock outstanding	19,318	19,183	19,262	18,834
Common stock equivalents	494	554	525	608
Weighted-average number of shares	19,812	19,737	19,787	19,442
Diluted earnings per share	$ 0.03	$ 0.32	$ 0.08	$ 0.01