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Stock-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Installment
$ / shares
shares
Mar. 31, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation | $ $ 0.4 $ 0.3
Number of installments of restricted shares | Installment 3  
Restricted stock award vesting rights The directors’ restricted shares vest on the first anniversary of the grant date.  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense of restricted stock | $ $ 2.2 $ 1.8
2005 Executive Incentive Compensation Plan [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock shares granted | shares 436,990  
Weighted average fair market value of restricted shares granted | $ / shares $ 3.63  
Non-Employee Directors' Restricted Stock Plan [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock shares granted | shares 139,880  
Weighted average fair market value of restricted shares granted | $ / shares $ 3.58  
Cliff Vest [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted shares, vesting period 5 years