Quarterly report pursuant to Section 13 or 15(d)

Summary of Restricted Shares Activity (Detail)

v3.5.0.2
Summary of Restricted Shares Activity (Detail) - Restricted Stock
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares  
Number of Restricted Shares, Beginning Balance | shares 134,633
Number of Restricted Shares, Shares Granted | shares 327,508
Number of Restricted Shares, Shares Vested | shares (73,494)
Number of Restricted Shares, Shares Forfeited | shares (19,214)
Number of Restricted Shares, Ending Balance | shares 369,433
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value Per Share, Beginning Balance | $ / shares $ 19.36
Weighted Average Grant Date Fair Value Per Share, Shares Granted | $ / shares 6.25
Weighted Average Grant Date Fair Value Per Share, Shares Vested | $ / shares 16.70
Weighted Average Grant Date Fair Value Per Share, Shares Forfeited | $ / shares 19.54
Weighted Average Grant Date Fair Value Per Share, Ending Balance | $ / shares $ 7.52