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 ($)
3 Months Ended 12 Months Ended 90 Months Ended
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2015
Jul. 31, 2012
Cash and cash equivalents                          
Losses in all previous reporting periods from inception to date $ 6,576,413 $ 5,987,345 $ 4,618,237 $ 4,061,116 $ 3,543,358 $ 3,816,844 $ 2,600,429 $ 2,051,486 $ 21,243,111 $ 12,012,117 $ 7,150,187 $ 46,606,143  
Cash and cash equivalents $ 32,035,264       $ 37,852,694       $ 32,035,264 $ 37,852,694 $ 4,970,175 $ 32,035,264 $ 5,141,509