Deferred Revenue - Additional Information (Details)																			3 Months Ended	12 Months Ended
	May 28, 2016 USD ($)	Feb. 29, 2016 USD ($)	Dec. 23, 2015 USD ($)	Dec. 08, 2015 USD ($)	Oct. 02, 2015 USD ($)	Sep. 22, 2015 USD ($) shares	Jul. 20, 2015 USD ($) shares	Feb. 17, 2015 USD ($)	Nov. 13, 2014 USD ($)	Oct. 31, 2014 USD ($) shares	Sep. 17, 2014 USD ($) shares	Sep. 09, 2014 USD ($) shares	Sep. 08, 2014 USD ($)	Aug. 13, 2014 USD ($)	Jul. 28, 2014 USD ($)	Jul. 22, 2014 USD ($) shares	May 15, 2014 USD ($) shares	Dec. 17, 2013 USD ($) shares	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2016 USD ($)
Deferred Revenue Arrangement [Line Items]
Proceeds from funding agreement	$ 266,500		$ 715,500	$ 500,000	$ 618,000	$ 1,600,000	$ 250,000	$ 988,000	$ 1,034,000	$ 500,000	$ 500,000	$ 500,000	$ 444,500	$ 422,000			$ 300,000	$ 250,000
Interest in asset	0.35533%	1.50%	0.954%	0.75%	0.824%	2.1333%	0.50%	1.97609%	2.06723%	0.98%	1.00%	0.98%	0.88891%	0.84469%	0.22294%	6.00%	1.50%	0.50%			0.75%
Number of shares issuable (in shares) | shares							25,000			50,000	62,500	50,000					37,500	31,250
Deferred revenue per month																		$ 7,200
Number of shares issuable term						60 days	60 days			60 days	60 days	60 days				60 days	60 days	60 days
Number of shares per dollar exchange rate (in shares) | shares						0.1										10
Recognized as revenue																			$ 22,000	$ 39,000
Deferred revenue additions		$ 1,000,000													$ 111,500	$ 3,000,000
Within 2.5 Years
Deferred Revenue Arrangement [Line Items]
Buyback term on ownership percentage				2 years 6 months		2 years 6 months				2 years 6 months		2 years 6 months				2 years 6 months
Buyback rate				2		2				2		2				2
After 2.5 Years
Deferred Revenue Arrangement [Line Items]
Buyback term on ownership percentage				2 years 6 months		2 years 6 months				2 years 6 months		2 years 6 months				2 years 6 months
Buyback rate						3.5										3.5
After 2.5 Years To 4 Years
Deferred Revenue Arrangement [Line Items]
Buyback rate				3.5						3.5		3.5
No Later Than 4 Years
Deferred Revenue Arrangement [Line Items]
Buyback term on ownership percentage				4 years						4 years		4 years
Reaserach And Development Arrangement December 17, 2013
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																			21,700	$ 39,900
Reaserach and Development Arrangementmay May 15, 2014
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																					$ 300,000
Reaserach and Development Arrangement July 22, 2014
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																					3,000,000
Reaserach and Development Arrangement September 9, 2014
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																					500,000
Research and Development Arrangement September 17, 2014
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																			0
Reaserach and Development Arrangement October 31, 2014
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																					500,000
Research and Development Arrangement July 20, 2015
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																					0
Research and Development Arrangement September 22, 2015
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																			$ 0
Reaserach and Development Arrangement December 8, 2015
Deferred Revenue Arrangement [Line Items]
Recognized as revenue																					$ 500,000