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Stock Options and Restricted Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 15, 2018
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Sep. 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]                    
Stock option outstanding   1,083,712 [1]       1,111,687 951,669 [1]      
Stock option exercisable   554,119       320,922        
Unvested shares under restricted common stock plan   529,593       790,765        
Intrinsic value of options vested   $ 0.1                
Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares outstanding, unvested restricted stock units   64,672                
Number of shares outstanding, vested restricted stock units   47,715                
Number of shares, vested   (47,715)                
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                
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   745,270 [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   383,925 163,561     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 2,210,968                
Shares were rolled into the 2018 Plan   25,996                
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   16,957                
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   745,270                
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                
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  
Share based compensation, options term 10 years                  
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                  
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                
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          
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 March 31, 2022 and the related exercise price of the underlying options, was $2.2 million for outstanding options and $1.1 million for exercisable options as of March 31, 2022. The remaining contractual life was 7.8 years for outstanding options and 7.3 years for exercisable options at March 31, 2022.
[2] The aggregate fair value of the restricted stock was $6.3 million as of March 31, 2022. The remaining vesting period was 2.9 years at March 31, 2022.
[3] The aggregate fair value of the restricted stock vested was $0.7 million for the three months ended March 31, 2022 and was $0.8 million for the three months ended March 31, 2021.