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Stock-Based Compensation and Employee Stock Purchase Program - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 02, 2022
shares
May 20, 2015
shares
May 14, 2015
Jun. 30, 2019
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
IncentivePlan
shares
Jun. 30, 2022
USD ($)
Dec. 31, 2022
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             26,021    
Total number of options outstanding         84,755   84,755   60,002
Intrinsic value of options exercised | $             $ 0    
Unrecognized compensation cost related to unvested stock-based compensation grants | $         $ 969,000   $ 969,000    
Weighted-average remaining recognition period             2 years 2 months 12 days    
Stock-based compensation | $         $ 199,000 $ 323,000 $ 411,000 $ 583,000  
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         9,170   9,170    
Stock-based compensation | $         $ 2,000 $ 1,000 $ 3,000 $ 2,000  
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             1,563    
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         8,477   8,477   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.    
Total number of shares reserved for issuance under plan   3,860     86,834   86,834    
Options vesting period   4 years              
Additional shares authorized for issuance under the plan       3,000          
Common stock available for future grant         10,660   10,660    
Total number of options outstanding         76,174   76,174   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         103   103   103