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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Shares    
Beginning Balance 3,342,325 3,332,617
Granted 1,434,750 454,000
Forfeited/Cancelled (120,187) (348,718)
Exercised   (95,574)
Ending Balance 4,656,888 3,342,325
Exercisable, December 31, 2016 3,384,238  
Weighted Average Exercise Price    
Beginning Balance $ 5.70 $ 5.79
Granted 0.97 3.23
Forfeited/Cancelled 3.41 4.42
Exercised   1.80
Ending Balance 4.30 $ 5.70
Exercisable, December 31, 2016 $ 5.44  
Weighted Average Remaining Contractual Life (Years)    
Outstanding, December 31, 2016 6 years 9 months 29 days  
Exercisable, December 31, 2016 5 years 9 months 11 days  
Stock Options Aggregate Intrinsic Value    
Outstanding, December 31, 2016 $ 120  
Exercisable, December 31, 2016 $ 22