Private Placements and Public Offering (Details) (USD $)
 0 Months Ended 1 Months Ended 5 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended 54 Months Ended 63 Months Ended 1 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended
Dec. 17, 2012
Dec. 31, 2012
Mar. 31, 2012
Jun. 30, 2011
item
Mar. 31, 2011
Dec. 31, 2012
Mar. 28, 2012
Apr. 30, 2013
Apr. 30, 2012
Jul. 31, 2012
Jul. 31, 2012
Apr. 30, 2013
Dec. 12, 2012
Jul. 31, 2011
Jun. 24, 2011
Mar. 18, 2011
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
Apr. 30, 2013
Maximum
Jul. 31, 2012
Maximum
Dec. 31, 2011
Warrants
Jun. 24, 2011
Warrants issued with March 2011 Private Placement
Jun. 30, 2011
Warrants issued with March 2011 Private Placement
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
Mar. 28, 2012
Series A Warrant
Jun. 24, 2011
Series A Warrant
Jun. 24, 2011
Series B Warrant
Jun. 30, 2011
Series C Warrant
Jun. 24, 2011
Series C Warrant
Mar. 31, 2012
Warrants issued with March 2012 Public Offering
Apr. 30, 2013
Warrants issued with March 2012 Public Offering
Jul. 31, 2012
Warrants issued with March 2012 Public Offering
Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Number of units issued under private placement       4,000,000 1,456,000                                                                      
Shares issued in offering 28,800,000   31,000,000                                                                   31,000,000      
Purchase price of units issued under private placement (in dollars per unit)         $ 0.75                                                                      
Common stock, purchase price (in dollars per share)             $ 0.25               $ 0.75                                                  
Proceeds from private placement       $ 3,000,000 $ 1,092,000                                           $ 3,000,000                          
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 $ 1.20 $ 0.50       $ 1.00   $ 0.50 $ 1.20 $ 0.75   $ 1.20       $ 0.35
Term of warrants                                                         5 years   5 years       5 years     5 years 5 years  
Fair value of warrants                                           276,980               431,981               3,206,486 3,206,486  
Volatility rate (as a percent)                                         125.00%               89.68%               125.00%      
Risk-free interest rate (as a percent)                                         1.05%               2.11%               1.05%      
Number of series of warrants       3                                                                        
Number of common shares that can be acquired upon exercise of warrants             31,000,000               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%                 100.00%      
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%                                          
Placement agent fees       180,000                                                                        
Reimbursement of expenses to lead placement agent       30,000                                                                        
Total cash fees paid to placement agents       210,000   504,000 542,500 504,000 542,500 542,500 542,500 1,046,500                                                        
Percentage of placement agent warrants paid to Roth Capital Partners, LLC     5.00% 6.00%                               30.00%                                        
Warrants issued to placement agents (in shares)   1,440,000 1,550,000 240,000                             1,085,000 465,000                                        
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 $ 0.0001   $ 0.0001 $ 0.001                                            
Proceeds from public offering   7,200,000 7,750,000                                                                          
Proceeds from public offering, net of offering costs   $ 6,700,000 $ 7,200,000                                                                          
Non-accountable expense allowance as a percentage of gross proceeds of offering                                     1.00%