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BALANCE SHEET COMPONENTS (Tables)
 3 Months Ended
Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Investments in Marketable Debt Securities, by Contractual Maturity Date
The following table summarizes the estimated fair value of our investments in marketable debt securities, by the contractual maturity date:
 
As of October 31, 2017
 
(in thousands)
Due within 1 year
$
153,044

Due after 1 year through 3 years
80,442

Total
$
233,486
Schedule of Property, Plant and Equipment
Property and Equipment—Net—Property and equipment, net consists of the following:
 
Estimated
Useful Life
(In months)
 
As of
 
 
July 31, 2017
 
October 31, 2017
 
 
 
(in thousands)
Computer, production, engineering and other equipment
36
 
$
85,280

 
$
97,027

Demonstration units
12
 
46,387

 
49,109

Leasehold improvements
   *
 
10,562

 
14,605

Furniture and fixtures
60
 
4,744

 
5,483

Total property and equipment—gross
 
 
146,973


166,224

Less accumulated depreciation and amortization
 
 
(88,901
)
 
(98,649
)
Total property and equipment—net
 
 
$
58,072


$
67,575

____________
*
Leasehold improvements are amortized over the shorter of the estimated useful lives of the improvements or the remaining lease term.
Schedule of Finite-Lived Intangible Assets
Intangible Assets—Net—Intangible assets, net consists of the following:
 
As of
 
July 31, 2017
 
October 31, 2017
 
(in thousands
Indefinite-lived intangible asset:
 
 
 
In-process R&D*
$
16,100

 
$
—

Finite-lived intangible assets:
 
 
 
Developed technology*
7,300

 
23,400

Customer relationships
4,830

 
4,830

Total finite-lived intangible assets, gross
12,130

 
28,230

Total intangible assets, gross
28,230

 
28,230

Less:
 
 
 
Accumulated amortization of developed technology
(1,314
)
 
(2,209
)
Accumulated amortization of customer relationships
(915
)
 
(1,126
)
Total accumulated amortization
(2,229
)
 
(3,335
)
Intangible assets, net
$
26,001

 
$
24,895
Schedule of Indefinite-Lived Intangible Assets
Intangible Assets—Net—Intangible assets, net consists of the following:
 
As of
 
July 31, 2017
 
October 31, 2017
 
(in thousands
Indefinite-lived intangible asset:
 
 
 
In-process R&D*
$
16,100

 
$
—

Finite-lived intangible assets:
 
 
 
Developed technology*
7,300

 
23,400

Customer relationships
4,830

 
4,830

Total finite-lived intangible assets, gross
12,130

 
28,230

Total intangible assets, gross
28,230

 
28,230

Less:
 
 
 
Accumulated amortization of developed technology
(1,314
)
 
(2,209
)
Accumulated amortization of customer relationships
(915
)
 
(1,126
)
Total accumulated amortization
(2,229
)
 
(3,335
)
Intangible assets, net
$
26,001

 
$
24,895
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
Estimated future amortization expense of finite-lived intangible assets is as follows:
Year Ending July 31:
(In thousands)
2018 (remaining nine months)
$
4,066

2019
5,421

2020
5,421

2021
5,421

2022
4,224

Thereafter
342

Total
$
24,895
Schedule of Accrued Liabilities
Accrued Compensation and Benefits—Accrued compensation and benefits consists of the following:
 
As of
 
July 31, 2017
 
October 31, 2017
 
(in thousands)
Accrued commissions
$
20,388

 
$
19,410

Accrued vacation
6,286

 
6,984

Contributions to ESPP withheld
14,371

 
6,008

Accrued bonus
7,342

 
5,384

Payroll taxes payable
3,434

 
6,603

Other
5,700

 
5,912

Total accrued compensation and benefits
$
57,521


$
50,301

Accrued Expenses and Other Current Liabilities—Accrued expenses and other current liabilities consists of the following:
 
As of
 
July 31, 2017
 
October 31, 2017
 
(in thousands)
Accrued professional services
$
4,167

 
$
3,635

Income taxes payable*
3,873

 
3,929

Other
1,667

 
1,867

Total accrued expenses and other current liabilities
$
9,707


$
9,431