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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, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Mar. 01, 2016
Feb. 29, 2016
Jun. 16, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock option outstanding   869,605 871,228 869,605   550,040 144,666      
Stock option exercisable [1]   179,079   179,079            
Unvested shares of common stock outstanding   690,526 703,948 690,526   487,262        
Weighted average fair value of options granted     $ 6.68              
Intrinsic value of options vested   $ 1,000   $ 42,000            
Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares outstanding   15,624   15,624   26,040        
Number of shares available for grant       0 0 26,040        
Vesting period           1 year        
Exercise price for grant per share           $ 4.80        
Number of shares vested and settled       10,416            
Restricted Shares [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares outstanding   362,943 [2] 363,639 362,943 [2]   284,879 190,915      
Weighted average fair value of options granted       $ 3.30 $ 2.98          
Number of shares available for grant     165,674 165,674 167,849 216,148        
Exercise price for grant per share     $ 6.68     $ 6.59        
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   1,003,015   1,003,015            
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 of common stock outstanding   362,943   362,943            
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 June 30, 2020 and the related exercise price of the underlying options, was $9,000 for outstanding options and $8,000 for exercisable options as of June 30, 2020. The remaining contractual life was 8.85 years for outstanding options and 7.49 years for exercisable options at June 30, 2020.
[2] The aggregate fair value of the restricted stock was $962,000 as of June 30, 2020. The remaining vesting period was 2.45 years at June 30, 2020.