Cash and Cash Equivalents and Liquidity (Details) - USD ($)	3 Months Ended		93 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Jul. 31, 2015	Jul. 31, 2014
Cash and Cash Equivalents and Liquidity
Losses in all previous reporting periods from inception to date	$ 7,037,391	$ 4,061,116	$ 53,600,000
Cash and cash equivalents	$ 26,896,369	$ 33,989,597	$ 26,896,369	$ 32,035,264	$ 37,852,694