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Derivative Liability - Assumptions Used to Value Derivative Liabilities at Closing Dates of Private Placements (Detail) - Warrant Derivative Liability [Member] - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Closing price per share of common stock $ 3.77 $ 8.35 $ 3.54
Exercise price per share $ 1.00 $ 1.00 $ 1.00
Expected volatility 73.90% 78.20% 76.80%
Risk-free interest rate 0.64% 1.62% 0.56%
Dividend yield 0.00% 0.00% 0.00%
Remaining expected term of underlying securities (years) 1 year 8 months 16 days 2 years 8 months 16 days 1 year 11 months 16 days