Quarterly report pursuant to Section 13 or 15(d)

Recent Other Equity and Common Stock Transactions (Details)

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Recent Other Equity and Common Stock Transactions (Details) - USD ($)
6 Months Ended 12 Months Ended
Nov. 09, 2015
Nov. 03, 2015
Jun. 08, 2015
Jan. 31, 2016
Jul. 31, 2015
Other equity and common stock transactions          
Warrants issued to purchase shares       3,073,675  
Shares issued in offering 2,142,860   2,469,091    
Share Price $ 3.50   $ 5.50    
Gross proceeds from public offering $ 7,500,000   $ 13,600,000    
Net proceeds from public offering $ 6,900,000   $ 12,500,000    
Dividends paid       $ 0 $ 0
Minimum          
Other equity and common stock transactions          
Warrants exercise price (in dollars per share)       $ 5.20  
Maximum          
Other equity and common stock transactions          
Warrants exercise price (in dollars per share)       $ 24.00  
Warrants issued with November 2015 Public Offering          
Other equity and common stock transactions          
Warrants issued to purchase shares 1,071,430        
Warrants exercise price (in dollars per share) $ 4.50        
Number of shares of common stock entitled to be purchased as a percentage of shares issued to such investor 50.00%        
Period after issuance the warrants are exercisable 6 months        
Fair value of warrants $ 1,600,000        
Dividend yield (as a percent) 0.00%        
Expected term 5 years 6 months        
Volatility rate (as a percent) 88.63%        
Risk-free interest rate (as a percent) 1.75%        
Warrants issued with November 2015 Public Offering | Wainwright          
Other equity and common stock transactions          
Warrants exercise price (in dollars per share)   $ 4.375      
Placement agent fees as a percentage of offering proceeds   6.00%      
Non-accountable expense allowance as a percentage of gross proceeds of offering   1.00%      
Shares issued to placement agents   107,143      
Fair value of warrants   $ 200,000      
Dividend yield (as a percent)   0.00%      
Expected term   5 years      
Volatility rate (as a percent)   89.08%      
Risk-free interest rate (as a percent)   1.75%      
Warrants issued with November 2015 Public Offering | Wainwright | Maximum          
Other equity and common stock transactions          
Percentage of warrants paid to placement agents   5.00%      
Warrants issued with June 2015 Public Offering | Placement Agents          
Other equity and common stock transactions          
Warrants exercise price (in dollars per share)     $ 6.88    
Placement agent fees as a percentage of offering proceeds     6.00%    
Non-accountable expense allowance as a percentage of gross proceeds of offering     1.00%    
Shares issued to placement agents     123,455    
Fair value of warrants     $ 600,000    
Warrants issued with June 2015 Public Offering | Placement Agents | Maximum          
Other equity and common stock transactions          
Percentage of warrants paid to placement agents     5.00%