Loan Payable (Details Textual) - USD ($)						3 Months Ended	12 Months Ended
	Oct. 02, 2017	Sep. 01, 2017	Aug. 01, 2017	Jul. 03, 2017	Feb. 06, 2017	Apr. 30, 2017	Jul. 31, 2017	Jul. 31, 2016
Debt Instrument [Line Items]
Loans payable							$ 11,274,000
Class B common stock [Member]
Debt Instrument [Line Items]
Warrant issued to purchase common stock				6,899	252,161	147,682
Warrants exercise price				$ 179.62	$ 34.70
Warrants expire date					Dec. 31, 2018
Proceeds from aggregate warrants					$ 7,500,000
Subsequent Event [Member] | Class B common stock [Member]
Debt Instrument [Line Items]
Warrant issued to purchase common stock	5,152	5,188	6,911
Warrants exercise price	$ 180.48	$ 179.18	$ 179.26
Loan Agreement [Member]
Debt Instrument [Line Items]
Borrowed from investors					$ 17,500,000
Interest rate					5.00%
Interest rate, increased					10.00%
Loan maturity date					Dec. 29, 2017
Payments of initial civil penalty					$ 15,000,000
Payments of first installments							$ 5,125,000
Warrant issued to purchase common stock							147,682
Percentage of warrant description							The Lenders are entitled to receive additional warrants on a monthly basis with an aggregate value equal to 7.5% (the rate was 10% for July 2017 and August 2017) of the then outstanding Loan Amount.
Cash costs							$ 80,000
Amortization amount							2,286,000
Interest expense, debt							402,000
Loans payable							11,274,000
Unamortized debt discounts							$ 1,101,000