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Summary of Option Activity (Detail) - Incentive Stock Options	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance | shares	332,823
Incentive Stock Option Plans, Option exercised | shares	(15,836)
Incentive Stock Option Plans, Ending balance | shares	316,987
Weighted Average Price Per Share, Beginning balance | $ / shares	$ 9.14
Weighted Average Price Per Share, Option exercised | $ / shares	8.83
Weighted Average Price Per Share, Ending balance | $ / shares	$ 9.16

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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