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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
Jun. 25, 2024
shares
Feb. 02, 2022
shares
May 20, 2015
shares
May 14, 2015
Jun. 30, 2019
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
IncentivePlan
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
IncentivePlan
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of equity incentive plans | IncentivePlan               2   2    
Shares Subject to Outstanding, Options granted               158,000   26,021 33,408  
Total number of options outstanding           217,575   217,575   80,078 60,002 35,554
Unrecognized compensation cost related to unvested stock-based compensation grants | $           $ 524,000   $ 524,000   $ 623,000    
Weighted-average remaining recognition period               1 year 4 months 24 days   2 years 1 month 6 days    
Weighted-average estimated grant-date fair value of stock options granted | $ / shares                   $ 5.72 $ 38.5  
Stock-based compensation | $           $ 155,000 $ 162,000 $ 395,000 $ 573,000 $ 717,000 $ 1,106,000  
Purchase plan offering period       6 months                
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   7,265    
Stock-based compensation | $           $ 2,000 $ 7,000 $ 6,000 $ 12,000 $ 6,000 $ 4,000  
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   3,468    
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                   8,366 8,477  
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.   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   86,835    
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       3,000              
Common stock available for future grant           127,725   127,725   15,226    
Total number of options outstanding           210,523   210,523   71,609 51,421  
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   102 103