Stock Options and Restricted Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended						9 Months Ended			12 Months Ended
	Jun. 15, 2018	Sep. 30, 2023		Jun. 30, 2023		Mar. 31, 2023		Sep. 30, 2023		Sep. 30, 2022	Dec. 31, 2022		Dec. 31, 2021	Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option outstanding		965,146	[1]	983,986	[1]	992,072		965,146	[1]		1,061,849		1,111,687
Stock option exercisable		702,886						702,886
Unvested shares under restricted common stock plan		262,260		262,260		262,260		262,260			513,423
Number of shares vested								158,937
Intrinsic value of options vested								$ 0.4
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, unvested restricted stock units		242,881						242,881
Number of shares outstanding, vested restricted stock units		158,937						158,937
Restricted Stock Units [Member] | Vest on June 22, 2024 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted								83,158
Weighted average grant price, granted											$ 9.14
Restricted Stock Units [Member] | Vest on June 14, 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted											129,638
Weighted average grant price, granted											$ 6.75
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, unvested restricted stock units		917,608		917,734	[2]	906,204		917,608			857,288		493,326
Number of shares vested		0		0		245,990	[3]				129,140	[4]
Weighted average fair value of options granted								$ 0		$ 0
Number of shares, granted		0		11,734		304,749		316,483		383,925	522,475
Weighted average grant price, granted		$ 0		$ 7.67		$ 8.08					$ 7.46
PSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted		0						296,444
Weighted average grant price, granted								$ 6.08
Unvested Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, performance share units		296,444						296,444
Maximum [Member] | PSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage								200.00%
Minimum [Member] | PSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage								0.00%
2018 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant		5,710,968						5,710,968
Shares were rolled into the 2018 Plan		2,317,228						2,317,228
2018 Equity Incentive Plan [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, vested restricted stock units		83,944						83,944
2018 Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares under restricted common stock plan		917,608						917,608
2015 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	258,334													300,000
2015 Director Plan [Member] | Non Employee Director One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	12,000
2015 Director Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	10 years
Amended Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant														200,000
Number of additional shares available for issuance		0						0
Amended Director Plan [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant		9,000						9,000
Amended Director Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, options term								10 years

[1] The aggregate intrinsic value of outstanding options, which represents the difference between the price of the Company’s common stock at September 30, 2023 and the related exercise price of the underlying options, was $0.5 million for outstanding options and $0.4 million for vested options as of September 30, 2023. The remaining contractual life was 6.4 years for outstanding options and 6.1 years for vested options at September 30, 2023

[2] The aggregate fair value of the restricted stock was $6.4 million as of September 30, 2023. The remaining vesting period was 2.4 years at September 30, 2023.

[3] The aggregate fair value of the restricted stock vested was $2.1 million for the nine months ended September 30, 2023 and was $1.0 million for the year ended December 31, 2022.

[4] The aggregate intrinsic value of exercised options, which represents the difference between the price of the Company’s common stock at the exercise date and the related exercise price of the underlying options, was $0.1 million for the three and nine months ended September 30, 2023 and was $0.1 million for the year ended December 31, 2022.