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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, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares Unvested, Beginning Balance 238,921  
Number of Shares, Granted 0  
Number of Shares, Vested (106,095)  
Number of Shares, Cancelled 0  
Number of Shares Unvested, Ending Balance 132,826 238,921
Weighted Average Grant Date Fair Value Unvested, Beginning Balance $ 5.41  
Weighted Average Grant Date Fair Value, Granted 0 $ 3.54
Weighted Average Grant Date Fair Value, Vested 4.81  
Weighted Average Grant Date Fair Value, Cancelled 0  
Weighted Average Grant Date Fair Value Unvested, Ending Balance $ 5.90 $ 5.41