Annual report pursuant to section 13 and 15(d)

Cash and Cash Equivalents and Liquidity (Details)

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Cash and Cash Equivalents and Liquidity (Details) (USD $)
1 Months Ended 6 Months Ended 12 Months Ended 66 Months Ended 0 Months Ended
Dec. 31, 2012
Mar. 31, 2012
Jun. 30, 2011
Jul. 31, 2008
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Jul. 31, 2013
Jun. 24, 2011
Sep. 18, 2013
Warrants issued with September 2013 Public Offering
Cash and Cash Equivalents and Liquidity                        
Losses in all previous reporting periods from inception to date       $ 7,187 $ 7,150,187 $ 2,364,852 $ 3,758,817 $ 36,158 $ 33,714 $ 13,350,915    
Cash and cash equivalents         4,970,175 5,141,509 2,457,693     4,970,175    
Public Offerings                        
Shares issued in offering 28,800,000 31,000,000 4,000,000                 47,792,000
Number of common shares that can be acquired upon exercise of warrants                     12,000,000 23,896,000
Net, proceeds from issuance of common stock and warrants $ 6,700,000 $ 7,200,000                   $ 11,100,000