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Summary of Stock Option Activity (Detail) - $ / shares
1 Months Ended 9 Months Ended
Jan. 31, 2015
Sep. 30, 2015
Shares    
Beginning Balance 3,332,617 3,332,617
Granted 304,000 454,000
Exercised   (95,574)
Options forfeited/cancelled   (348,718)
Ending Balance   3,342,325
Weighted Average Exercise Price    
Beginning Balance $ 5.79 $ 5.79
Granted   3.23
Exercised   1.80
Options forfeited/cancelled   4.42
Ending Balance   $ 5.70