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Restricted Stock Units - Summary of Restricted Stock Unit Activity (Detail) - Nonvested Restricted Stock Units [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]      
Beginning balance 140,000 210,000  
Number of Restricted Stock Units Outstanding, Granted 380,000 0 210,000
Number of Restricted Stock Units Outstanding, Vested (70,000) (70,000)  
Number of Restricted Stock Units Outstanding, Forfeited (27,500)    
Ending balance 422,500 140,000 210,000
Weighted Average Grant Date Fair Value, Unvested $ 7.19 $ 7.19  
Weighted Average Grant Date Fair Value, Granted 2.94   $ 7.19
Weighted Average Grant Date Fair Value, Vested 7.19 7.19  
Weighted Average Grant Date Fair Value, Forfeited 2.94    
Weighted Average Grant Date Fair Value, Unvested $ 3.64 $ 7.19 $ 7.19