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OVERVIEW AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Allowance for accounts receivable, beginning balance $ 132 $ 132 $ 410
Charged to provision for doubtful accounts (credit) 815 0 (85)
Write-offs (132) 0 (193)
Allowance for doubtful accounts—ending balance $ 815 $ 132 $ 132