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Stockholders' Equity - Summary of Stock Option Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding Beginning Balance, Number of Shares 5,006,532 4,141,948
Granted, Number of Shares 2,242,625 1,305,000
Canceled/Forfeited, Number of Shares (1,305,249) (440,416)
Outstanding Ending Balance, Number of Shares 5,943,908 5,006,532
Exercise Price Per Share, Minimum $ 0.78 $ 1.45
Exercise Price Per Share, Maximum 3.75 3.75
Outstanding Beginning Balance, Weighted-Average Exercise Price Per Share 2.66 2.48
Granted, Weighted-Average Exercise Price Per Share 0.83 2.77
Canceled/Forfeited, Weighted Average Exercise Price Per Share 2.52 2.09
Outstanding Ending Balance, Weighted Average Exercise Price Per Share 2.04 2.66
Outstanding, 2.00 - 3.25 [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Exercise Price Per Share, Minimum   2.00
Exercise Price Per Share, Maximum   3.25
Granted, 1.45-3.75 [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Exercise Price Per Share, Minimum   1.45
Exercise Price Per Share, Maximum   3.75
Canceled/Forfeited, 2.05-2.10 [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Exercise Price Per Share, Minimum   2.05
Exercise Price Per Share, Maximum   2.10
Outstanding, 1.45-3.75 [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Exercise Price Per Share, Minimum   1.45
Exercise Price Per Share, Maximum   $ 3.75
Granted, 0.78-1.46 [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Exercise Price Per Share, Minimum 0.78  
Exercise Price Per Share, Maximum 1.46  
Canceled/Forfeited, 1.28-3.75 [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Exercise Price Per Share, Minimum 1.28  
Exercise Price Per Share, Maximum 3.75  
Outstanding, 0.78-3.75 [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Exercise Price Per Share, Minimum 0.78  
Exercise Price Per Share, Maximum $ 3.75