Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation Stock Option Activity (Detail)

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Stock Based Compensation Stock Option Activity (Detail) - Jun. 30, 2015 - Plan Name [Domain] - Relationship to Entity [Domain] - USD ($)
Total
Option Shares Outstanding  
Outstanding, Beginning Balance 8,637,962
Awarded 2,987,500
Exercised 0
Forfeited (515,625)
Outstanding, Ending Balance 11,109,837
Vested 8,051,432
Vested and expected to vest 11,109,837
Weighted Average Exercise Price  
Outstanding, Beginning Balance $ 0.34
Awarded 0.19
Exercised 0
Forfeited 0.35
Outstanding, Ending Balance 0.31
Vested 0.32
Vested and expected to vest $ 0.31
Weighted Average Remaining Contractual Term (years)  
Awarded  
Exercised  
Forfeited  
Balance 5 years 4 months 10 days
Vested 4 years 8 months 26 days
Vested and expected to vest 5 years 4 months 10 days
Aggregate Intrinsic Value  
Outstanding, Beginning Balance $ 0
Awarded 0
Exercised 0
Forfeited 0
Outstanding, Ending Balance 292,860
Vested 160,901
Vested and expected to vest $ 292,860