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Restricted Stock, Stock Options and Other Stock Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining contractual term of unexercised stock options (in years)			7 years
Unrecognized compensation cost related to stock options and restricted stock awards	$ 1.3		$ 1.3		$ 0.6
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued by the company (in shares)	0		0	114,431
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued by the company (in shares)	14,500	12,085	644,852	254,336

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