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Stock-Based Compensation and Employee Stock Purchase Program - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 25, 2024 shares | Feb. 02, 2022 shares | May 20, 2015 shares | May 14, 2015 | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) IncentivePlan shares | Jun. 30, 2023 USD ($) | Dec. 31, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of equity incentive plans | IncentivePlan |  |  |  |  |  |  | 2 |  |
Shares Subject to Outstanding, Options granted |  |  |  |  |  |  | 0 |  |
Total number of options outstanding |  |  |  |  | 64,174 |  | 64,174 |  | 80,078
Unrecognized compensation cost related to unvested stock-based compensation grants | $ |  |  |  |  | $ 373,000 |  | $ 373,000 |  |
Weighted-average remaining recognition period |  |  |  |  |  |  | 1 year 1 month 6 days |  |
Stock-based compensation | $ |  |  |  |  | $ 102,000 | $ 199,000 | $ 240,000 | $ 411,000 |
2015 Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total number of shares reserved for issuance under plan |  |  |  |  | 5,309 |  | 5,309 |  |
Stock-based compensation | $ |  |  |  |  | $ 2,000 | $ 2,000 | $ 4,000 | $ 3,000 |
Percentage in payroll deductions to acquire shares of common stock |  |  |  | 15.00% |  |  |  |  |
Purchase plan offering period |  |  |  | 6 months |  |  |  |  |
Employees are able to purchase company's common stock on first trading day of offering period, percentage |  |  |  | 85.00% |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan |  |  |  |  |  |  | 5,971 |  |
First offering period, start date |  |  |  | May 14, 2015 |  |  |  |  |
First offering period, end date |  |  |  | Feb. 01, 2016 |  |  |  |  |
Inducement Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total number of options outstanding |  |  |  |  | 8,103 |  | 8,103 |  | 8,366
Inducement Stock Option [Member] | Stanley Jacot, Jr. [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares Subject to Outstanding, Options granted |  | 7,902 |  |  |  |  |  |  |
2015 Omnibus Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Terms under the plan |  |  |  |  |  |  | The 2015 Plan became effective upon the Company’s IPO in May 2015 and all shares that were reserved, but not issued, under the 2006 Plan were assumed by the 2015 Plan. Upon effectiveness, the 2015 Plan had 3,860 shares of common stock reserved for future issuance, which included 259 that were transferred to and assumed by the 2015 Plan. The 2015 Plan provides for automatic annual increases in shares available for grant. In addition, shares subject to awards under the 2006 Plan that are forfeited or canceled will be added to the 2015 Plan. |  |
Total number of shares reserved for issuance under plan |  |  | 3,860 |  | 338,248 |  | 338,248 |  |
Number of shares awarded o individual employee | 50,000 |  | 9,375 |  |  |  |  |  |
Options vesting period |  |  | 4 years |  |  |  |  |  |
Additional shares authorized for issuance under the plan | 200,000 |  |  |  |  |  |  |  |
Common stock available for future grant |  |  |  |  | 282,280 |  | 282,280 |  |
Total number of options outstanding |  |  |  |  | 55,969 |  | 55,969 |  | 71,609
2015 Omnibus Equity Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Options exercisable period |  |  | 10 years |  |  |  |  |  |
2006 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total number of shares reserved for issuance under plan |  |  | 259 |  |  |  |  |  |
Total number of options outstanding |  |  |  |  | 102 |  | 102 |  | 102

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