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Stock-Based Compensation and Employee Stock Purchase Program - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Jun. 25, 2024
shares
Feb. 02, 2022
shares
May 20, 2015
shares
May 14, 2015
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
IncentivePlan
shares
Sep. 30, 2023
USD ($)
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             158,000    
Total number of options outstanding         217,575   217,575   80,078
Unrecognized compensation cost related to unvested stock-based compensation grants | $         $ 524,000   $ 524,000    
Weighted-average remaining recognition period             1 year 4 months 24 days    
Stock-based compensation | $         $ 155,000 $ 162,000 $ 395,000 $ 573,000  
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         3,209   3,209    
Stock-based compensation | $         $ 2,000 $ 7,000 $ 6,000 $ 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             8,073    
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         6,949   6,949   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         127,725   127,725    
Total number of options outstanding         210,523   210,523   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