Annual report pursuant to Section 13 and 15(d)

Private Placements and Public Offerings (Details)

v2.4.0.8
Private Placements and Public Offerings (Details) (USD $)
0 Months Ended 2 Months Ended 5 Months Ended 8 Months Ended 10 Months Ended 12 Months Ended 78 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended
Jun. 06, 2014
Sep. 18, 2013
Dec. 17, 2012
Mar. 28, 2012
Jun. 24, 2011
item
Sep. 17, 2013
Dec. 17, 2012
Mar. 28, 2012
Mar. 18, 2011
Jun. 06, 2014
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2014
Dec. 12, 2012
Mar. 02, 2011
Feb. 28, 2011
Jun. 24, 2011
Maximum
Jul. 31, 2014
Maximum
Mar. 18, 2011
Warrants issued with March 2011 Private Placement
Mar. 31, 2011
Warrants issued with March 2011 Private Placement
Jun. 24, 2011
Series A Warrant
Jun. 24, 2011
Series B Warrant
Jun. 24, 2011
Series C Warrant
Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Rodman
Jan. 23, 2012
Warrants issued with March 2012 Public Offering
Rodman
Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Roth
Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Placement Agents
Dec. 17, 2012
Warrants issued with December 2012 Public Offering
Dec. 17, 2012
Warrants issued with December 2012 Public Offering
Placement Agents
Jul. 31, 2014
Warrants issued with December 2012 Public Offering
Placement Agents
Dec. 17, 2012
Warrants issued with December 2012 Public Offering
Dawson
Nov. 16, 2012
Warrants issued with December 2012 Public Offering
Dawson
Dec. 17, 2012
Warrants issued with December 2012 Public Offering
Noble and Burrill
Dec. 17, 2013
Warrants issued with December 2012 Public Offering
Maximum
Sep. 18, 2013
Warrants issued with September 2013 Public Offering
Aug. 16, 2013
Warrants issued with September 2013 Public Offering
Placement Agents
Aug. 16, 2013
Warrants issued with September 2013 Public Offering
H.C. Wainwright
Aug. 16, 2013
Warrants issued with September 2013 Public Offering
Maxim
Jun. 06, 2014
Warrants issued with June 2014 Public Offering
Jun. 06, 2014
Warrants issued with June 2014 Public Offering
Jun. 03, 2014
Warrants issued with June 2014 Public Offering
Placement Agents
Jun. 03, 2014
Warrants issued with June 2014 Public Offering
Noble
Jun. 03, 2014
Warrants issued with June 2014 Public Offering
H.C. Wainwright
Jun. 03, 2014
Warrants issued with June 2014 Public Offering
Maxim
Private Placements and Public Offerings                                                                                            
Number of units issued under private placement                 1,456,000                                                                          
Shares issued in offering 22,536,212 47,792,000 28,800,000 31,000,000 4,000,000                                                                                  
Aggregate number of shares of common stock the warrants can purchase         12,000,000           37,647,790     37,647,790                     31,000,000         14,400,000             23,896,000         7,887,325        
Purchase price of units issued under private placement (in dollars per unit)                 $ 0.75                                                                          
Common stock, purchase price (in dollars per share)         $ 0.75                                                                                  
Gross proceeds from private placement         $ 3,000,000       $ 1,092,000                                                                          
Composition of private placement unit, number of shares of common stock                 1                                                                          
Composition of private placement unit, number of warrants to purchase common stock                                       1                                                    
Number of common shares that can be acquired upon exercise of each whole warrant                 1                                                                          
Exercise price of warrants (in dollars per share)                             $ 0.26       $ 1.20 $ 1.00   $ 1.20 $ 0.75 $ 1.20 $ 0.35       $ 0.3125     $ 0.3125         $ 0.35 $ 0.3125                
Term of warrants                                       5 years   5 years 5 years   5 years         4 years             4 years                  
Fair value of warrants                                       431,981         3,206,486       276,980 2,151,360 228,240           2,461,008 410,535       2,756,979 631,707      
Dividend yield (as a percent)                                         0.00%       0.00%       0.00% 0.00% 0.00%           0.00% 0.00%     0.00%   0.00%      
Volatility rate (as a percent)                                       89.68%         125.00%       125.00% 96.66% 98.09%           83.62% 94.57%     90.30%   90.30%      
Risk-free interest rate (as a percent)                                       2.11%         1.05%       1.05% 0.56% 0.74%           1.43% 1.43%     1.53%   1.53%      
Number of series of warrants         3                                                                                  
Aggregate net proceeds from sale of common stock and Warrants         2,790,000                                                                                  
Number of shares of common stock entitled to be purchased as a percentage of shares issued to such investor                                                 100.00%         50.00%             50.00%                  
Period from date of closing for filing registration statement under registration rights agreement         30 days                                                                                  
Penalty for non-compliance of registration rights agreement as a percentage of aggregate net proceeds of private placement                                   9.00%                                                        
Placement agent fees as a percentage of offering proceeds       6.00% 6.00%                                                         6.00%         6.00%           6.00%  
Placement agent fees         180,000                                                                                  
Reimbursement of expenses to lead placement agent         30,000                                                                               25,000  
Total cash fees paid to placement agents         210,000 836,360 504,000 542,500   1,145,000 1,981,360 504,000 542,500 3,027,860                                                                
Percentage of warrants paid to placement agents   5.00%   5.00% 6.00%                                             30.00%             50.00% 5.00%       20.00%     45.00% 22.50% 6.00% 22.50%
Placement agent fees (as a percent)                                                                               5.00%     45.00% 22.50%   22.50%
Warrants issued to placement agents (in shares)   2,389,600 1,440,000 1,550,000 240,000                                         1,085,000   465,000         720,000   360,000       1,911,680 477,920            
Par value of shares shown as a reduction to paid-in capital         400                                                                                  
Common stock, par value (in dollars per share)         $ 0.0001           $ 0.0001 $ 0.0001   $ 0.0001   $ 0.0001 $ 0.001                                                          
Proceeds from issuance of common stock and warrants     7,200,000 7,750,000                                                                 11,950,000       16,000,000          
Net, proceeds from issuance of common stock and warrants     $ 6,700,000 $ 7,200,000                                                                 $ 11,100,000       $ 14,900,000          
Non-accountable expense allowance as a percentage of gross proceeds of offering                                                     1.00%             1.00%         1.00%           1.00%