BALANCE SHEET COMPONENTS - Accrued Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jul. 31, 2016
Other Liabilities Disclosure [Abstract]
Accrued professional services	$ 4,167	$ 3,585
Income taxes payable	3,580	1,417
Other	1,667	535
Total accrued expenses and other current liabilities	$ 9,414	$ 5,537