Equity Incentive Plans and Employee Stock Purchase Plan - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands |
3 Months Ended |
12 Months Ended |
Apr. 30, 2018 |
Jan. 31, 2018 |
| Shares |
|
|
| Balance - beginning of period (in shares) |
12,637,435
|
|
| Stock options granted (in shares) |
0
|
|
| Stock options exercised (in shares) |
(40,723)
|
|
| Repurchase of early exercised shares (in shares) |
0
|
|
| Stock options forfeited and expired (in shares) |
(123,781)
|
|
| Balance - end of period (in shares) |
12,472,931
|
12,637,435
|
| Vested and exercisable (in shares) |
6,236,117
|
5,540,858
|
| Weighted- Average Exercise Price Per Share |
|
|
| Balance - beginning of period (in dollars per share) |
$ 7.63
|
|
| Stock options granted (in dollars per share) |
0.00
|
|
| Stock options exercised (in dollars per share) |
6.36
|
|
| Stock options forfeited and expired (in dollars per share) |
9.22
|
|
| Balance - end of period (in dollars per share) |
7.61
|
$ 7.63
|
| Vested and exercisable (in dollars per share) |
$ 6.46
|
$ 6.33
|
| Weighted- Average Remaining Contractual Term (In Years) |
|
|
| Balance |
7 years 5 months 9 days
|
7 years 8 months 19 days
|
| Vested and exercisable |
6 years 6 months 4 days
|
6 years 7 months 17 days
|
| Aggregate Intrinsic Value |
|
|
| Balance |
$ 353,927
|
$ 246,227
|
| Vested and exercisable |
$ 184,152
|
$ 115,122
|