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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Unvested, Beginning Balance 132,826    
Number of Shares, Granted 0    
Number of Shares, Vested (91,159)    
Number of Shares, Cancelled 0    
Number of Shares Unvested, Ending Balance 41,667 132,826  
Weighted Average Grant Date Fair Value Unvested, Beginning Balance $ 5.90    
Weighted Average Grant Date Fair Value, Granted 0.00 $ 0.00 $ 3.54
Weighted Average Grant Date Fair Value, Vested 3.55    
Weighted Average Grant Date Fair Value, Cancelled 0.00    
Weighted Average Grant Date Fair Value Unvested, Ending Balance $ 11.04 $ 5.90