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Warrant Activity and Related Balances Outstanding (Detail) (USD $)
 3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Jul. 31, 2012
Number      
Shares purchasable under outstanding warrants at June 30, 2012   2,400,328  
Stock purchase warrants issued 48,297 507,019  
Stock purchase warrants exercised   0  
Shares purchasable under outstanding warrants at December 31, 2012 2,907,347 2,907,347  
Average Purchase Price Per Share      
Shares purchasable under outstanding warrants at June 30, 2012   $ 0.41 $ 0.41
Stock purchase warrants issued $ 0.41 $ 0.41  
Stock purchase warrants exercised $ 0 $ 0  
Shares purchasable under outstanding warrants at December 31, 2012 $ 0.41 $ 0.41 $ 0.41
Weighted Average Remaining Contract Term   4 years 5 months 27 days