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Stockholders' Equity - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 01, 2011
Stock Holders Equity Note [Line Items]          
Preferred stock, shares authorized   5,000,000 5,000,000    
Preferred stock, shares outstanding   0      
Stock options issued   64,333 216,000    
Intrinsic value of stock options outstanding   $ 900,000      
Intrinsic value of exercisable stock options   200,000      
Stock option expense   200,000 $ 100,000 $ 0  
Unrecognized compensation cost related to stock options   $ 700,000      
Exercisable, Weighted Average Remaining Contractual Term   7 years      
Incentive Plan [Member]          
Stock Holders Equity Note [Line Items]          
Reserve of common stock for grant, award or issuance to directors and employees   600,000      
Employee Stock Option [Member]          
Stock Holders Equity Note [Line Items]          
Weighted-average period related to stock compensation   4 years 4 months 24 days      
Time Vested Restricted Stock Awards [Member]          
Stock Holders Equity Note [Line Items]          
Issued   36,434 11,824    
Unearned share-based compensation   $ 800,000 $ 500,000 $ 500,000  
Exercisable, Weighted Average Remaining Contractual Term   3 years 6 months      
Key Personnel [Member]          
Stock Holders Equity Note [Line Items]          
Stock options issued 216,000 64,333      
Key Personnel [Member] | Employee Stock Option [Member]          
Stock Holders Equity Note [Line Items]          
Stock options vesting period 6 years 5 years      
Key Personnel [Member] | Employee Stock Option [Member] | Vesting on Each Anniversary [Member]          
Stock Holders Equity Note [Line Items]          
Stock options vesting increments 16.67% 20.00%      
Employees and Directors [Member] | Time Vested Restricted Stock Awards [Member]          
Stock Holders Equity Note [Line Items]          
Issued   36,434   31,572  
Employees and Directors [Member] | Time Vested Restricted Stock Awards [Member] | Tranche One [Member]          
Stock Holders Equity Note [Line Items]          
Stock options vesting period   5 years   1 year  
Issued   30,305   2,450  
Employees and Directors [Member] | Time Vested Restricted Stock Awards [Member] | Tranche Two [Member]          
Stock Holders Equity Note [Line Items]          
Stock options vesting period   2 years   5 years  
Issued   6,129   29,122  
Employees [Member] | Time Vested Restricted Stock Awards [Member]          
Stock Holders Equity Note [Line Items]          
Issued     11,824    
Employees [Member] | Time Vested Restricted Stock Awards [Member] | Tranche One [Member]          
Stock Holders Equity Note [Line Items]          
Stock options vesting period     5 years    
Issued     3,335    
Employees [Member] | Time Vested Restricted Stock Awards [Member] | Tranche Two [Member]          
Stock Holders Equity Note [Line Items]          
Stock options vesting period     6 years    
Issued     8,489    
South Louisiana Business Bank [Member]          
Stock Holders Equity Note [Line Items]          
Stock warrants issued         130,875
Warrant exercisable price per share         $ 13.33
IPO [Member]          
Stock Holders Equity Note [Line Items]          
Common stock issued 3,285,300