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Goodwill and Intangible Assets, net - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017 | Jul. 13, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |  |
Goodwill | $ 18,095,000 |  | $ 18,095,000 |  | $ 6,282,000 | [1] |  |
Goodwill impairments | 0 | $ 0 | 0 | $ 0 |  |  |  |
Capitalized internal-use software | 800,000 | 1,900,000 | 2,000,000 | 3,300,000 |  |  |  |
Stock-based compensation included in capitalized software costs | 100,000 | 400,000 | $ 300,000 | $ 600,000 |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Amortization expense | $ 1,200,000 | $ 700,000 |  |  | $ 2,400,000 |  | $ 1,400,000 |
ScaleFT, Inc. |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 11,800,000
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Purchased developed technology |  |  |  |  |  |  |  | 4,600,000
ScaleFT, Inc. | Purchased developed technology |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Purchased developed technology |  |  |  |  |  |  |  | $ 4,600,000
[1] | See Note 2 for a summary of adjustments.

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