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Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
May 12, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Authorized shares of stock, option plan, maximum           2,300,000
Maximum number of shares of restricted stock or shares subject to a restricted stock units award granted         50,000  
Maximum number of options and SARs         100,000  
Maximum number of stock options and SARs awarded         10,000  
Maximum number of Shares of restricted stock or shares subject to a restricted stock units award granted to individual non-employee director         10,000  
Vesting period of awards     1/3 per year      
Recognition of compensation expense $ 1,369 $ 1,198 $ 2,622 $ 2,311    
Maximum term for awards granted (years)     10 years      
Shares issued related stock option exercises     14,994 47,960    
Total intrinsic value of options exercised     $ 249 $ 713    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     0 months