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Goodwill and Acquired Intangible Assets | 6 Months Ended
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Jan. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Acquired Intangible Assets | Goodwill and Acquired Intangible Assets The changes in the carrying amount of goodwill consisted of the following:
| Amount
| (in thousands)
Balance as of July 31, 2019 | $ | 7,479 |
Goodwill activity | — |
Balance as of January 31, 2020 | $ | 7,479 |
Acquired intangible assets consist of developed technology and customer relationships acquired through our asset and business acquisitions. Acquired intangible assets are amortized using the straight-line method over their useful lives. Acquired intangible assets subject to amortization consisted of the following as of January 31, 2020 and July 31, 2019:
| Gross Carrying Amount |  |  |  |  |  | Accumulated Amortization |  |  |  |  |  | Net Carrying Amount |  |
| July 31, 2019 |  | Additions |  | January 31, 2020 |  | July 31, 2019 |  | Amortization Expense |  | January 31, 2020 |  | January 31, 2020 |  | July 31, 2019
| (in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technology | $ | 9,456 |  |  | $ | — |  |  | $ | 9,456 |  |  | $ | (897) |  |  | $ | (1,405) |  |  | $ | (2,302) |  |  | $ | 7,154 |  |  | $ | 8,559 |
Customer relationships | 160 |  |  | — |  |  | 160 |  |  | (11) |  |  | (16) |  |  | (27) |  |  | 133 |  |  | 149 |
Total | $ | 9,616 |  |  | $ | — |  |  | $ | 9,616 |  |  | $ | (908) |  |  | $ | (1,421) |  |  | $ | (2,329) |  |  | $ | 7,287 |  |  | $ | 8,708 |
Amortization expense of acquired intangible assets for the three and six months ended January 31, 2020 was $0.6 million and $1.4 million, respectively. Amortization expense of acquired intangible assets for the three and six months ended January 31, 2019 was $0.1 million and $0.2 million, respectively. Amortization expense of developed technology and customer relationships is recorded primarily within cost of revenues, sales and marketing expenses and research and development expenses in the condensed consolidated statements of operations. Future amortization expense of acquired intangible assets consisted of the following as of January 31, 2020:
| Amount
Year ending July 31, | (in thousands)
2020 (remaining six months) |  | $ | 1,283 |
2021 | 2,567 |
2022 | 1,960 |
2023 | 1,456 |
2024 | 21 |
Total | $ | 7,287 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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