Commitments - Section A (Details)					3 Months Ended		12 Months Ended
	Sep. 23, 2017 USD ($) shares	Sep. 22, 2017 USD ($) $ / shares	Sep. 08, 2017 USD ($) installment trading_days	Apr. 25, 2016	Oct. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2016 USD ($)
Other Commitments [Line Items]
Rent expense					$ 71,000	$ 22,000
Accrued liabilities, current					2,094,000		$ 1,432,000
2014 Consulting Agreement
Other Commitments [Line Items]
Fixed fees								$ 225,000
Additional consultant fee payable, percentage of perpetuity in excess of $3 million							3.75%
Sponsor fees							$ 963,600	318,000
2016 Consulting Agreement
Other Commitments [Line Items]
Sponsor fees							687,500	$ 0
Percentage of gross funding up to $20 million				5.00%
Percentage of gross funding over $20 million				3.50%
Accrued liabilities, current							$ 928,500
Advisory Services
Other Commitments [Line Items]
Sponsor fees					0
Accrued liabilities					400,000
Accrued liabilities, current					200,000
Other commitment			$ 300,000
Number of installment payments | installment			3
Installment payment period			16 months
Stock issued during period, value, issued for services	$ 100,000	$ 133,000	$ 300,000
Payments for other commitment fees	$ 240,600
Share price of stock issued (in dollars per share) | $ / shares		$ 40.58
Milestone payment			$ 140,600
Milestone payment percentage			3.75%
Milestone payment period			15 days
Milestone payment percentage of total consideration with payment			3.375%
Milestone payment percentage of total consideration with payment and additional provision			3.5625%
Milestone period			6 years
Milestone payment percentage of total consideration without payment			3.45525%
Milestone payment percentage of total consideration without payment and with additional provision			3.60263%
Threshold trading days | trading_days			10
Stock issued during period for services (in shares) | shares	3,283
Accrued liabilities					$ 200,000