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Share-Based Compensation - Additional Information (Detail)
3 Months Ended
Mar. 31, 2019
USD ($)
CompensationPlan
shares
Mar. 31, 2018
USD ($)
shares
Dec. 31, 2018
shares
Aug. 31, 2011
shares
Aug. 01, 2011
shares
May 31, 2003
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock-based compensation plans | CompensationPlan 2          
Annual increase in number of shares available for grant 500,000          
Percentage of common shares outstanding 4.00%          
Number of shares available for issue, additional shares 500,000          
Stock options, vesting period 4 years          
Stock options, expire period 10 years          
Unrecognized stock-based compensation | $ $ 637,000          
Recognized weighted-average period years 2 years 3 months 18 days          
Stock-based compensation expense | $ $ 59,000 $ 29,000        
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares of common stock to be received, per restricted stock unit and performance stock unit 1          
Restricted stock units outstanding 250,000   250,000      
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) Subject to Performance-based Vesting            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units outstanding 0 0        
Stock-based compensation expense | $ $ 0 $ 0        
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock based compensation | $ $ 140,000          
Stock Incentive Plan 2003            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grants           922,086
Stock Incentive Plan 2011            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grants 1,748,812       80,235  
Share reserved for incentive plan       450,000