Stock-Based Compensation - Summary of Stock Option Activity under Company's Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, beginning balance	140,000
Options Outstanding, Granted	25,000
Options Outstanding, Exercised	0
Options outstanding, ending balance	165,000
Options Outstanding, Options exercisable	137,500
Options Outstanding, Options vested or expected to vest	162,880
Weighted-Average Exercise Price Per Share, Options outstanding, beginning balance	$ 13.14
Weighted-Average Exercise Price Per Share, Granted	29.64
Weighted- Average Exercise Price Per Share, Options outstanding, ending balance	15.64
Weighted- Average Exercise Price Per Share, Options exercisable	12.96
Weighted-Average Exercise Price Per Share, Options vested or expected to vest	$ 15.46
Weighted-Average Remaining Contractual Term in Years, Options outstanding	6 years 1 month 9 days
Weighted-Average Remaining Contractual Term in Years, Options exercisable	5 years 4 months 9 days
Weighted-Average Remaining Contractual Term in Years, Options vested or expected to vest	6 years 21 days
Aggregate Intrinsic Value, Exercised		$ 20
Aggregate Intrinsic Value, Options outstanding	$ 2,375
Aggregate Intrinsic Value, Options exercisable	2,347
Aggregate Intrinsic Value, Options vested or expected to vest	$ 2,374