Stock-Based Compensation - Summary of Stock Option Activity under Company's Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, beginning balance	140,000
Options Outstanding, Exercised	0
Options outstanding, ending balance	140,000
Options Outstanding, Options exercisable	117,500
Options Outstanding, Options vested or expected to vest	139,548
Weighted-Average Exercise Price Per Share, Options outstanding, beginning balance	$ 13.14
Weighted- Average Exercise Price Per Share, Options outstanding, ending balance	13.14
Weighted- Average Exercise Price Per Share, Options exercisable	11.76
Weighted-Average Exercise Price Per Share, Options vested or expected to vest	$ 13.11
Weighted-Average Remaining Contractual Term in Years, Options outstanding	5 years 8 months 4 days
Weighted-Average Remaining Contractual Term in Years, Options exercisable	5 years
Weighted-Average Remaining Contractual Term in Years, Options vested or expected to vest	5 years 8 months 1 day
Aggregate Intrinsic Value, Exercised		$ 138
Aggregate Intrinsic Value, Options outstanding	$ 1,208
Aggregate Intrinsic Value, Options exercisable	1,196
Aggregate Intrinsic Value, Options vested or expected to vest	$ 1,208