Net Loss Per Share - Anti-dilutive Securities (Details) - shares
shares in Thousands |
3 Months Ended |
Apr. 30, 2019 |
Apr. 30, 2018 |
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
| Antidilutive securities excluded from computation of earnings per share (in shares) |
17,274
|
49,682
|
| Redeemable convertible preferred stock |
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
| Antidilutive securities excluded from computation of earnings per share (in shares) |
0
|
36,001
|
| Shares subject to outstanding common stock options |
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
| Antidilutive securities excluded from computation of earnings per share (in shares) |
16,529
|
12,387
|
| Unvested early exercised stock options |
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
| Antidilutive securities excluded from computation of earnings per share (in shares) |
273
|
211
|
| Warrants to purchase common stock |
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
| Antidilutive securities excluded from computation of earnings per share (in shares) |
0
|
204
|
| Early exercised stock options in exchange for note receivable |
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
| Antidilutive securities excluded from computation of earnings per share (in shares) |
0
|
250
|
| Restricted stock awards purchased with promissory notes |
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
| Antidilutive securities excluded from computation of earnings per share (in shares) |
472
|
629
|