Significant Customers (Details)	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Concentration Risk [Line Items]
Number of customers	4	3
Customer One [Member]
Concentration Risk [Line Items]
Percentage of revenue from customers	19.00%	34.00%
Percentage of accounts receivable from customers	56.00%	50.00%
Customer Two [Member]
Concentration Risk [Line Items]
Percentage of revenue from customers	17.00%	24.00%
Percentage of accounts receivable from customers	18.00%	37.00%
Customer Three [Member]
Concentration Risk [Line Items]
Percentage of revenue from customers	11.00%	16.00%
Percentage of accounts receivable from customers	11.00%	6.00%
Customer Four [Member]
Concentration Risk [Line Items]
Percentage of revenue from customers	8.00%	5.00%