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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Jul. 31, 2017
Deferred tax assets:    
Net operating loss carryforward $ 162,914 $ 135,929
Deferred revenue 27,577 2,378
Tax credit carryforward 47,839 13,100
Property and equipment 0 1,118
Accruals and reserves 8,370 7,427
Stock-based compensation expense 21,252 27,512
Total deferred tax assets 267,952 187,464
Deferred tax liabilities:    
Deferred commission expense (27,829) (22,535)
Goodwill and intangible assets (5,909) (483)
Property and equipment (3,870) 0
Other (497) (75)
Total deferred tax liabilities (38,105) (23,093)
Valuation allowance (226,987) (161,195)
Net deferred tax assets $ 2,860 $ 3,176