Nature of Business and Summary of Significant Accounting Policies - Schedule of Numerators and Denominators Used to Calculate Basic and Diluted Earnings Per Share (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator (for basic and diluted earnings per share)
Net income (loss)	$ 8,211	$ 17,707	$ (7,121)
Denominator
Basic weighted-average shares outstanding	35,289,616	34,987,878	34,714,395
Common stock equivalents arising from stock options and restricted stock awards	231,000	496,000
Diluted weighted-average shares outstanding	35,520,670	35,484,273	34,714,395