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Summary of Restricted Stock Activity (Detail) - Restricted Stock
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Number of shares  
Beginning balance | shares 101,435
Grants | shares 109,170
Vested | shares (42,972)
Cancellations | shares (2,000)
Ending balance | shares 165,633
Total unrecognized compensation expense remaining | $ $ 2,347,300
Weighted-average years expected to be recognized over 3 years 1 month 6 days
Weighted-average exercise price  
Beginning balance | $ / shares $ 14.77
Grants | $ / shares 15.64
Vested | $ / shares 14.84
Cancellations | $ / shares 14.84
Ending balance | $ / shares $ 15.33