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Stockholders' Equity/(Deficit) - Estimated Fair Value of Restricted Stock Award (Detail) (Unvested Restricted Stock Awards Excluded from EPS [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Unvested Restricted Stock Awards Excluded from EPS [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Unvested, Beginning Balance 178,807    
Number of Shares, Granted 411,383    
Number of Shares, Vested (402,065)    
Number of Shares, Cancelled       
Number of Shares Unvested, Ending Balance 188,125 178,807  
Weighted Average Grant Date Fair Value Unvested, Beginning Balance $ 2.73    
Weighted Average Grant Date Fair Value, Granted $ 2.89 $ 3.91 $ 2.67
Weighted Average Grant Date Fair Value, Vested $ 2.81    
Weighted Average Grant Date Fair Value, Cancelled       
Weighted Average Grant Date Fair Value Unvested, Ending Balance $ 2.89 $ 2.73