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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 |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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