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Stock-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Installment
$ / shares
shares
Mar. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation | $ $ 0.3 $ 0.5
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 | $ $ 1.8 $ 3.8
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 390,325  
Weighted average fair market value of restricted shares granted | $ / shares $ 1.40  
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 90,000  
Weighted average fair market value of restricted shares granted | $ / shares $ 1.44  
Cliff Vest [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted shares, vesting period 5 years