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Stock-Based Compensation and Employee Stock Purchase Program - Additional Information (Detail) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Feb. 02, 2022 shares | Dec. 19, 2021 | Dec. 14, 2021 | May 17, 2021 shares | May 20, 2015 shares | May 14, 2015 | Jun. 30, 2019 shares | Sep. 30, 2022 USD ($) shares | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) IncentivePlan shares | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) 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 |  |  |  |  |  |  |  |  |  | 1,320,322 |  |
Total number of options outstanding |  |  |  |  |  |  |  | 2,401,734 |  | 2,401,734 |  | 1,422,195
Intrinsic value of options exercised | $ |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |
Unrecognized compensation cost related to unvested stock-based compensation grants | $ |  |  |  |  |  |  |  | $ 1,300,000 |  | $ 1,300,000 |  |
Weighted-average remaining recognition period |  |  |  |  |  |  |  |  |  | 2 years 6 months |  |
Stock-based compensation | $ |  |  |  |  |  |  |  | $ 314,000 | $ 354,000 | $ 897,000 | 1,035,000 |
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 |  |  |  |  |  |  |  | 128,914 |  | 128,914 |  |
Stock-based compensation | $ |  |  |  |  |  |  |  | $ 1,000 | $ 4,000 | $ 3,000 | $ 12,000 |
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 |  |  |  |  |  |  |  |  |  | 58,970 |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Shares Subject to Outstanding, Options granted |  |  |  | 248,000 |  |  |  |  |  |  |  |
Total number of options outstanding |  |  |  |  |  |  |  | 349,783 |  | 349,783 |  |
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 | 316,108 |  |  |  |  |  |  |  |  |  |  |
Separation Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable period |  | 2 years 6 months | 90 days |  |  |  |  |  |  |  |  |
Separation Agreement [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | $ |  |  |  |  |  |  |  |  |  |  |  | $ 154,000
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 154,387 shares of common stock reserved for future issuance, which included 10,637 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 |  |  |  |  | 154,387 |  |  | 2,484,005 |  | 2,484,005 |  |
Options vesting period |  |  |  |  | 4 years |  |  |  |  |  |  |
Additional shares authorized for issuance under the plan |  |  |  |  |  |  | 120,000 |  |  |  |  |
Common stock available for future grant |  |  |  |  |  |  |  | 439,867 |  | 439,867 |  |
Total number of options outstanding |  |  |  |  |  |  |  | 2,044,138 |  | 2,044,138 |  | 1,345,955
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 |  |  |  |  | 10,637 |  |  |  |  |  |  |
Total number of options outstanding |  |  |  |  |  |  |  | 7,813 |  | 7,813 |  | 8,240

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