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Share-Based Compensation - Summary of Stock Award Activity for the Period (Detail)
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share Based Arrangements To Obtain Goods And Services [Abstract]  
Number of shares awards outstanding, Beginning balance | shares 971,934
Number of shares, Granted | shares 129,500
Number of shares, Forfeited | shares (2,000)
Number of shares awards outstanding, Ending balance | shares 1,099,434
Number of shares, Options exercisable | shares 287,825
Number of shares options exercisable, Weighted average remaining contractual term 8 years 10 months 24 days
Number of shares, Options vested and expected to vest | shares 1,058,821
Number of shares options vested and expected to vest, Weighted average remaining contractual term 9 years
Weighted-average exercise price awards outstanding, Beginning balance | $ / shares $ 11.31
Weighted-average exercise price, Granted | $ / shares 5.80
Weighted-average exercise price, Forfeited | $ / shares 9.22
Weighted-average exercise price awards outstanding, Ending balance | $ / shares 10.67
Weighted-average exercise price, Options exercisable | $ / shares 11.97
Weighted-average exercise price, Options vested and expected to vest | $ / shares $ 10.73