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Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jul. 31, 2019
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Gross, beginning balance |  |  | $ 9,616 |  |
Additions |  |  | 0 |  |
Intangible Assets, Gross, ending balance | $ 9,616 |  | 9,616 |  |
Accumulated Amortization, beginning balance |  |  | (908) |  |
Amortization Expense | (600) | $ (100) | (1,421) | $ (239) |
Accumulated Amortization, ending balance | (2,329) |  | (2,329) |  |
Finite-Lived Intangible Assets, Net, Total | 7,287 |  | 7,287 |  | $ 8,708
Developed technology |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Gross, beginning balance |  |  | 9,456 |  |
Additions |  |  | 0 |  |
Intangible Assets, Gross, ending balance | 9,456 |  | 9,456 |  |
Accumulated Amortization, beginning balance |  |  | (897) |  |
Amortization Expense |  |  | (1,405) |  |
Accumulated Amortization, ending balance | (2,302) |  | (2,302) |  |
Finite-Lived Intangible Assets, Net, Total | 7,154 |  | 7,154 |  | 8,559
Customer relationships |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Gross, beginning balance |  |  | 160 |  |
Additions |  |  | 0 |  |
Intangible Assets, Gross, ending balance | 160 |  | 160 |  |
Accumulated Amortization, beginning balance |  |  | (11) |  |
Amortization Expense |  |  | (16) |  |
Accumulated Amortization, ending balance | (27) |  | (27) |  |
Finite-Lived Intangible Assets, Net, Total | $ 133 |  | $ 133 |  | $ 149

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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