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Stock Options and Restricted Stock - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 15, 2018
Sep. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Mar. 01, 2016
Feb. 29, 2016
Jun. 16, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock option outstanding   1,186,586 1,264,315 1,209,642 1,186,586   951,669 550,040      
Stock option exercisable [1]   326,116     326,116            
Unvested shares under restricted common stock plan   860,470 902,952 861,818 860,470   773,362        
Weighted average fair value of options granted     $ 6.79                
Number of shares, granted           165,674          
Intrinsic value of options vested   $ 0     $ 77,000            
Restricted Stock Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares outstanding, unvested restricted stock units   16,803     16,803            
Number of shares outstanding, vested restricted stock units   47,472     47,472            
Number of shares vested with deferred settlement         47,272            
Restricted Stock Units [Member] | Vest on June 17, 2022 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares outstanding, unvested restricted stock units   16,803     16,803            
Number of shares, granted         16,803            
Exercise price for grant per share         $ 8.87            
Restricted Stock Units [Member] | Vest on June 19, 2021 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares outstanding, unvested restricted stock units             47,156        
Number of shares, granted             47,156        
Exercise price for grant per share             $ 3.16        
Restricted Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares outstanding, unvested restricted stock units   436,295 [2] 452,522 442,190 436,295 [2]   416,140 284,879      
Weighted average fair value of options granted         $ 3.24 $ 3.30          
Number of shares, granted     163,561   163,561   229,408        
Exercise price for grant per share     $ 6.79       $ 6.21        
2018 Equity Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant 241,919 2,210,968     2,210,968            
Shares were rolled into the 2018 Plan   438,132     438,132            
2015 Restricted Stock Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant                 700,000    
Unvested shares under restricted common stock plan   860,470     860,470            
2006 Stock Option Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Issuance of maximum number of shares approved                     800,000
Number of additional shares available for issuance   0     0            
2006 Stock Option Plan [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation, options term         10 years            
2015 Director Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant 258,334                 300,000  
2015 Director Plan [Member] | Non Employee Director One [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant 12,000                    
2015 Director Plan [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation, options term 10 years                    
Amended Director Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant   200,000     200,000            
Number of additional shares available for issuance   0     0            
Amended Director Plan [Member] | Director [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant   9,000     9,000            
Amended Director Plan [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation, options term       10 years              
[1] The aggregate intrinsic value, which represents the difference between the price of the Company’s common stock at September 30, 2021 and the related exercise price of the underlying options, was $1,590,000 for outstanding options and $463,000 for exercisable options as of September 30, 2021. The remaining contractual life was 8.27 years for outstanding options and 7.21 years for exercisable options at September 30, 2021.
[2] The aggregate fair value of the restricted stock was $3,421,000 as of September 30, 2021. The remaining vesting period was 3.43 years at September 30, 2021.