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Share-based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2013
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to unvested stock options     $ 2.8
Expected weighted average period for recognition of compensation expense     1 year 8 months 12 days
Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, award vesting period     12 months
Share-based compensation arrangement by share-based payment award, expiration period     10 years
2008 Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock authorized     10,186,000
Shares available for future grant     3,908,012
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected weighted average period for recognition of compensation expense     7 months 6 days
Fair value of RSUs on the date of grant   $ 3.5  
RSUs grant date fair value per unit   $ 8.63  
Unrecognized compensation expense related to non-vested RSUs     $ 0.2
Restricted Stock Units (RSUs) | Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs granted 364,726    
Number of common stock to be received for each RSUs 1    
RSUs grant date fair value per unit $ 1.61    
RSUs outstanding     332,193
Restricted Stock Units (RSUs) | Chief Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs granted   400,000  
Number of common stock to be received for each RSUs   1  
Restricted Stock Units (RSUs) | Chief Executive Officer | Vested on August 30, 2014      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs vested percentage   33.33%  
Restricted Stock Units (RSUs) | Chief Executive Officer | Vested on August 30, 2015      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs vested percentage   33.33%  
Restricted Stock Units (RSUs) | Chief Executive Officer | Vested on August 30, 2016      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs vested percentage   33.33%  
Restricted Stock Units (RSUs) | 2008 Omnibus Plan | Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of common stock considered per unit in determining shares for future grant 1.25    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs vested percentage     25.00%
Share-based compensation arrangement by share-based payment award, award vesting period     36 months
Share-based compensation arrangement by share-based payment award, expiration period     10 years