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Stock Options and Restricted Stock - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 15, 2018
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Mar. 01, 2016
Feb. 29, 2016
Jun. 16, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares available for grant               700,000    
Stock option outstanding   1,081,609 [1] 1,083,712 [1] 1,081,609 [1]   1,111,687 951,669 [1]      
Stock option exercisable   552,381   552,381   320,922        
Unvested shares under restricted common stock plan   529,228 529,593 529,228   790,765        
Intrinsic value of options vested   $ 0   $ 100            
Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares outstanding, unvested restricted stock units   60,391   60,391            
Number of shares outstanding, vested restricted stock units   60,391   60,391            
Restricted Stock Units [Member] | Vest on June 17, 2022 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares, granted   0   0            
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, granted           16,803        
Restricted Shares [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares outstanding, unvested restricted stock units   744,687 [2] 745,270 [2] 744,687 [2]   493,326 [2] 416,140      
Number of shares, vested [3]     (126,234)     (158,994)        
Weighted average fair value of options granted       $ 3.50            
Number of shares, granted     383,925 383,925 163,561 258,120        
Exercise price for grant per share     $ 7.68     $ 7.38        
2018 Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares available for grant 241,919 5,710,968   5,710,968            
Shares were rolled into the 2018 Plan   3,528,019   3,528,019            
2018 Equity Incentive Plan [Member] | Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares outstanding, unvested restricted stock units   0   0            
2015 Restricted Stock Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unvested shares under restricted common stock plan   744,687   744,687            
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  
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 June 30, 2022 and the related exercise price of the underlying options, was $0.2 million for outstanding options and $0.1 million for exercisable options as of June 30, 2022. The remaining contractual life was 7.5 years for outstanding options and 7.1 years for exercisable options at June 30, 2022.
[2] The aggregate fair value of the restricted stock was $4.8 million as of June 30, 2022. The remaining vesting period was 2.7 years at June 30, 2022.
[3] The aggregate fair value of the restricted stock vested was $0 and $1.0 million for the three and six months ended June 30, 2022 and was $0 and $0.8 million for the three and six months ended June 30, 2021.