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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance 422,500 140,000 210,000
Number of Restricted Stock Units Outstanding, Granted 660,331 380,000 0
Number of Restricted Stock Units Outstanding, Vested (187,503) (70,000) (70,000)
Ending balance 895,328 422,500 140,000
Number of Restricted Stock Units Outstanding, Forfeited   (27,500)  
Weighted Average Grant Date Fair Value, Unvested $ 3.64 $ 7.19 $ 7.19
Weighted Average Grant Date Fair Value, Granted 3.74 2.94  
Weighted Average Grant Date Fair Value, Vested 4.53 7.19 7.19
Weighted Average Grant Date Fair Value, Unvested $ 3.53 3.64 $ 7.19
Weighted Average Grant Date Fair Value, Forfeited   $ 2.94