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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Apr. 30, 2018 | Jan. 31, 2018
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Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |
Prepaid expenses | $ 13,388 | $ 8,494
Other current assets | 4,187 | 2,897
Total prepaid expenses and other current assets | $ 17,575 | $ 11,391

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