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Stockholders' Equity - Summary of Stock Option Activity (Detail) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding Beginning Balance, Number of Shares 5,006,532
Granted, Number of Shares 145,625
Canceled/Forfeited, Number of Shares (111,084)
Outstanding Ending Balance, Number of Shares 5,041,073
Outstanding Beginning Balance, Weighted-Average Exercise Price Per Share $ 2.66
Granted, Weighted-Average Exercise Price Per Share 1.25
Canceled/Forfeited, Weighted Average Exercise Price Per Share 2.04
Outstanding Ending Balance, Weighted Average Exercise Price Per Share 2.56
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, 1.11-1.46 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 1.11
Exercise Price Per Share, Maximum 1.46
Canceled/Forfeited, 1.45-2.10 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 1.45
Exercise Price Per Share, Maximum 2.10
Outstanding, 1.11-3.75 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 1.11
Exercise Price Per Share, Maximum $ 3.75