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 1 Months Ended 5 Months Ended 8 Months Ended 12 Months Ended 66 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Jun. 24, 2011
Dec. 31, 2012
Mar. 31, 2012
Jun. 30, 2011
item
Dec. 18, 2012
Mar. 28, 2012
Mar. 18, 2011
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Dec. 12, 2012
Mar. 02, 2011
Feb. 28, 2011
Mar. 31, 2012
Rodman
Mar. 31, 2012
Roth
Mar. 31, 2012
Placement Agents
Mar. 28, 2012
Placement Agents
Jun. 30, 2011
Maximum
Jul. 31, 2013
Maximum
Mar. 31, 2011
Warrants issued with March 2011 Private Placement
Mar. 18, 2011
Warrants issued with March 2011 Private Placement
Jun. 30, 2011
Series A Warrant
Jun. 24, 2011
Series A Warrant
Jun. 30, 2011
Series B Warrant
Jun. 24, 2011
Series B Warrant
Jun. 24, 2011
Series C Warrant
Mar. 31, 2012
Warrants issued with March 2012 Public Offering
Jul. 31, 2013
Warrants issued with March 2012 Public Offering
Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Dec. 18, 2012
Warrants issued with December 2012 Public Offering
Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Dec. 30, 2012
Warrants issued with December 2012 Public Offering
Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Placement Agents
Jul. 31, 2013
Warrants issued with December 2012 Public Offering
Placement Agents
Dec. 30, 2012
Warrants issued with December 2012 Public Offering
Placement Agents
Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Dawson
Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Noble and Burrill
Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Maximum
Number of units issued under private placement             1,456,000                                                              
Shares issued in offering   28,800,000 31,000,000 4,000,000                                                                    
Aggregate number of shares of common stock the warrants can purchase                                                     31,000,000     14,400,000                
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           $ 0.3125   $ 1.20   $ 1   $ 1.20   $ 0.75 $ 1.20     $ 0.35         $ 0.3125        
Term of warrants                                       5 years   5 years   5 years       5 years     4 years              
Fair value of warrants                                 276,980       431,981             3,206,486       2,151,360     228,240      
Dividend yield (as a percent)                               0.00%       0.00%             0.00%       0.00%   0.00%          
Volatility rate (as a percent)                               125.00%       89.68%             125.00%       96.66%   98.09%          
Risk-free interest rate (as a percent)                               1.05%       2.11%             1.05%       0.56%   0.74%          
Number of series of warrants       3                                                                    
Number of common shares that can be acquired upon exercise of warrants 12,000,000                                                                          
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%              
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%    
Placement agent fees       180,000                                                                    
Reimbursement of expenses to lead placement agent       30,000                                                                    
Total cash fees paid to placement agents       210,000 504,000 542,500   504,000 542,500 1,046,500                                                        
Percentage of placement agent warrants paid to Roth Capital Partners, LLC     5.00% 6.00%                     30.00%                                           50.00% 5.00%
Warrants issued to placement agents (in shares)   1,440,000 1,550,000 240,000                   1,085,000 465,000                                         720,000 360,000  
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                                                                      
Net, proceeds from issuance of common stock and warrants   $ 6,700,000 $ 7,200,000                                                                      
Non-accountable expense allowance as a percentage of gross proceeds of offering                           1.00%                                           1.00%