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Stock Award Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
May 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 6,203 $ 6,857  
Weighted average grant date fair value of the stock options granted $ 1.32 $ 1.51  
Cash received from the exercise of options $ 124    
Total fair value of restricted stock units vested 1,100 $ 1,400  
Total grant date fair value of restricted stock units outstanding $ 2,300 2,400  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 10 years    
Weighted average vesting period for unrecognized compensation expense 2 years 10 months 24 days    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Weighted average vesting period for unrecognized compensation expense 1 year    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 36 months    
Vesting rights percentage 25.00%    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Restricted Stock | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting rights percentage 25.00%    
Performance-based Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost   $ 1,900  
Unrecognized compensation expense related to options $ 1,100    
Options and Performance-based Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to options 9,900    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to non-option $ 600    
2018 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity incentive plan, shares     12,000,000