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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Unvested, Beginning Balance 92,696    
Number of Shares, Granted 388,573    
Number of Shares, Vested (209,183)    
Number of Shares, Cancelled (33,165)    
Number of Shares Unvested, Ending Balance 238,921 92,696  
Weighted Average Grant Date Fair Value Unvested, Beginning Balance $ 13.20    
Weighted Average Grant Date Fair Value, Granted 3.54 $ 12.48 $ 17.16
Weighted Average Grant Date Fair Value, Vested 5.43    
Weighted Average Grant Date Fair Value, Cancelled 4.65    
Weighted Average Grant Date Fair Value Unvested, Ending Balance $ 5.41 $ 13.20