Equity (Details) - Warrant [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Oct. 31, 2017 USD ($) $ / shares shares
Class of Warrant or Right [Line Items]
Warrants Outstanding, Beginning Balance | shares	111,378
Warrants, Granted | shares	17,251
Warrants, Exercised | shares	(30,475)
Warrants, Cancelled/Forfeited | shares
Warrants Outstanding, and exercisable | shares	98,154
Weighted-average Exercise Price, Beginning Balance | $ / shares	$ 43.68
Weighted-average Exercise Price, Granted | $ / shares	179.60
Weighted-average Exercise Price, Exercised | $ / shares	34.70
Weighted-average Exercise Price, Cancelled/Forfeited | $ / shares
Weighted-average Exercise Price Outstanding and Exercisable | $ / shares	$ 70.35
Weighted-average Remaining Contractual Term (in years), Outstanding	1 year 4 months 24 days
Weighted-average Remaining Contractual Term (in years), Exercisable	1 year 1 month 6 days
Aggregate Intrinsic Value, Beginning Balance | $	$ 15,118
Aggregate Intrinsic Value, Outstanding and exercisable | $	$ 10,911