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Stockholders' Equity/(Deficit) - Estimated Fair Value of Restricted Stock Award (Detail) - Unvested Restricted Stock Awards Excluded from EPS [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Unvested, Beginning Balance 69,851    
Number of Shares, Granted 105,824    
Number of Shares, Vested (75,467)    
Number of Shares, Cancelled (7,513)    
Number of Shares Unvested, Ending Balance 92,696 69,851  
Weighted Average Grant Date Fair Value Unvested, Beginning Balance $ 16.56    
Weighted Average Grant Date Fair Value, Granted 12.48 $ 17.16 $ 34.68
Weighted Average Grant Date Fair Value, Vested 12.60    
Weighted Average Grant Date Fair Value, Cancelled 14.40    
Weighted Average Grant Date Fair Value Unvested, Ending Balance $ 13.20 $ 16.56