Description of Business and Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Reserves deducted from accounts receivable:
Allowance for doubtful accounts, Balance at beginning of year
Allowance for doubtful accounts, Additions charged to costs and expenses	19
Allowance for doubtful accounts, Deductions
Allowance for doubtful accounts, Balance at end of year	$ 19