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BALANCE SHEET COMPONENTS - Intangible Assets (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 06, 2016 | Aug. 22, 2016 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 54,150 | $ 12,130
Total intangible assets, gross |  |  |  |  |  |  |  |  |  |  |  |  | 54,150 | 28,230
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  | (8,784) | (2,229)
Intangible assets, net |  |  | $ 45,366 |  |  | $ 26,001 | $ 26,001 |  |  | $ 0 | $ 26,001 | $ 0 | 45,366 | 26,001
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net—beginning balance |  |  |  |  |  | 26,001 |  |  |  | 0 | 26,001 | 0 |  |
Amortization of intangible assets |  |  | (2,424) | $ (1,669) | $ (1,356) | $ (1,106) | (608) | $ (608) | $ (608) | $ (405) | (6,555) | (2,229) |  |
Intangible assets, net—ending balance |  |  | $ 45,366 |  |  |  | $ 26,001 |  |  |  | 45,366 | 26,001 |  |
Calm Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Life (in years) |  | 4 years 10 months |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  | $ 25,920 | $ 28,230 |  |
In-process R&D |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |
In-process R&D |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 16,100
Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, gross |  |  |  |  |  |  |  |  |  |  |  |  | 47,500 | 7,300
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  | (6,956) | (1,314)
Estimated Life (in years) | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technology | PernixData Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired | $ 3,570 |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, gross |  |  |  |  |  |  |  |  |  |  |  |  | 6,650 | 4,830
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,828) | $ (915)
Customer relationships | PernixData Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired | $ 4,600 |  |  |  |  |  |  |  |  |  |  |  |  |

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