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Stock-Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation, additional shares authorized 2,140,000      
Share based compensation, shares authorized   4,555,277    
Contractual term   10 years    
Stock Options, granted   0    
Weighted average grant-date fair value of options granted     $ 1.44  
Options exercised (in shares)   40,976    
Total unrecognized compensation costs   $ 300,000    
Weighted-average remaining period for recognition of unrecognized compensation costs   3 months 18 days    
Time Based Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Stock Options, granted   0    
Options exercised (in shares)   37,920    
Liability-Based Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 0 $ 0 $ 0
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercised (in shares)   40,976 0  
Intrinsic value of option exercised   $ 200,000    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average remaining period for recognition of unrecognized compensation costs   2 years 9 months 18 days    
Total unrecognized compensation costs   $ 5,700,000