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Common Stock and Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details) | Jan. 31, 2020 shares
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Class of Stock [Line Items] |
Common stock reserved for future issuance and options and unvested RSUs outstanding (in shares) | 37,362,403
Options and unvested RSUs outstanding |
Class of Stock [Line Items] |
Options and unvested RSUs outstanding (in shares) | 17,252,543
Common stock, reserved for future issuance (in shares) | 16,456,003
ESPP |
Class of Stock [Line Items] |
Common stock, reserved for future issuance (in shares) | 3,653,857

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