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BALANCE SHEET COMPONENTS | 3 Months Ended
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Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
BALANCE SHEET COMPONENTS | BALANCE SHEET COMPONENTS Short-Term Investments—The amortized cost of our short-term investments approximate their fair value. As of July 31, 2017 and October 31, 2017, unrealized gains or losses from our short-term investments were immaterial and there were no securities in an unrealized loss position for more than 12 months. 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 |
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 |
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* | Leasehold improvements are amortized over the shorter of the estimated useful lives of the improvements or the remaining lease term.
Depreciation and amortization expense related to our property and equipment was $8.2 million and $10.2 million for the three months ended October 31, 2016 and 2017, respectively. 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 |
* We started amortizing the in-process R&D during the first quarter of fiscal 2018 because the related technology was completed and released in the first quarter of fiscal 2018. We are amortizing the developed technology using the straight-line method over a useful life of 5 years. Based on the foregoing, the balance of in-process R&D is now presented as part of developed technology under finite-lived intangible assets as of October 31, 2017. The amortization expense of finite-lived intangible assets is being recognized in the condensed consolidated statement of operations within product cost of revenue for developed technology and sales and marketing expenses for customer relationships. 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 |
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 |
* Balance as of July 31, 2017 was adjusted to reflect the impact of the adoption of ASC 606 on income taxes. See Note 3 for a summary of adjustments.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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