Equity Incentive Plan - Summary of Stock Option Activity under the 2014 Plan and the Amended 2017 Plan (Detail)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Share-based Payment Arrangement [Abstract]
Beginning balance, Shares | shares	470,310
Granted, Shares | shares	36,000
Exercised ,Shares | shares	(57,020)
Forfeited or expired ,Shares | shares	(4,034)
Ending balance, shares | shares	445,256
Beginning balance of Weighted Average Exercise Price | $ / shares	$ 16.70
Granted ,Weighhted Average Exercise Price | $ / shares	18.17
Exercised ,Weighted Average Exercise Price | $ / shares	10.08
Forfeited or expired ,Weighted Average Exercise Price | $ / shares	6.35
Ending balance of Weighted Average Exercise Price | $ / shares	$ 17.75