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Stock-Based Compensation - Restricted Stock Activity (Detail) - 2007 Plan [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested Shares, Beginning Balance 271,425 195,767
Granted, Shares 185,076 248,864
Vested, Shares (161,176) (126,148)
Forfeited, Shares (10,866) (47,058)
Unvested Shares, Ending Balance 284,459 271,425
Unvested, Weighted-Average Grant-Date Fair Value, Beginning Balance $ 8.20 $ 6.79
Granted, Weighted-Average Grant-Date Fair Value 5.20 8.44
Vested, Weighted-Average Grant-Date Fair Value 8.22 6.71
Forfeited, Weighted-Average Grant-Date Fair Value 5.14 8.50
Unvested, Weighted-Average Grant-Date Fair Value, Ending Balance $ 5.98 $ 8.20