Quarterly report pursuant to Section 13 or 15(d)

Cash and Cash Equivalents and Liquidity (Details)

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Cash and Cash Equivalents and Liquidity (Details) - USD ($)
3 Months Ended 6 Months Ended 96 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Cash and Cash Equivalents and Liquidity              
Losses in all previous reporting periods from inception to date $ 7,037,720 $ 4,618,237 $ 14,075,111 $ 8,679,353 $ 60,700,000    
Cash and cash equivalents $ 28,845,271 $ 30,699,218 $ 28,845,271 $ 30,699,218 $ 28,845,271 $ 32,035,264 $ 37,852,694