Earnings Per Share - Schedule of Computation of 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
Basic:
Net income (loss)	$ 6,314	$ (4,144)	$ 209	$ (15,338)
Shares used in computation:
Weighted-average common stock outstanding	19,183	18,375	18,834	18,070
Basic earnings per share	$ 0.33	$ (0.23)	$ 0.01	$ (0.84)
Diluted:
Net income (loss)	$ 6,314	$ (4,144)	$ 209	$ (15,338)
Weighted-average shares outstanding:
Weighted-average common stock outstanding	19,183	18,375	18,834	18,070
Common stock equivalents	554		608
Weighted-average number of shares	19,737	18,375	19,442	18,070
Diluted earnings per share	$ 0.32	$ (0.23)	$ 0.01	$ (0.84)