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Stock Option Plan - Additional information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2020	May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding options issued	465,898	693,909	711,058
Proceeds from stock options exercised	$ 0	$ 21,000
Total intrinsic value of options		$ 26,000
Options available for future grant	1,302,411
Restricted Stock [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award granted	0	18,667
Repurchase of Shares of Restricted Stock	0	1,250
Price per Share		$ 36.15
Unvested Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs related to non-vested restricted stock outstanding	$ 400,000
Expected recognition period	1 year 6 months 10 days
Unvested Restricted Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award granted		18,667
Unrecognized stock-based compensation expense related to non-vested restricted stock arrangements	$ 0
the "2012 Plan" [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance					933,333
Options available for future grant	71,085
the "2012 Plan" [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	65,728
the "2020 Plan" [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized				1,400,000
Options available for future grant				1,471,085
the "2020 Plan" [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	400,167