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Stockholders' Equity (Tables) | 12 Months Ended
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Jan. 31, 2021
Equity [Abstract] |
Share of Common Stock Reserved For Future Issuance | We have reserved the following shares of common stock, on an as-if converted basis, for future issuance as follows:
| January 31,
(in thousands) | 2021 |  | 2020
RSUs outstanding | 10,962 |  |  | 14,246 |
Options issued and outstanding | 4,798 |  |  | 6,882 |
Remaining shares available for future issuance under the Equity Incentive Plans | 32,901 |  |  | 24,726 |
Remaining shares available for future issuance under the ESPP | 6,329 |  |  | 4,985 |
Total shares of common stock reserved | 54,990 |  |  | 50,839 |
Share-based Compensation, Activity | Shares available for grant under the 2018 Plan for the year ended January 31, 2021 was as follows:
(in thousands) | Year Ended January 31, 2021
Available at beginning of fiscal year | 24,726 |
Awards authorized | 9,063 |
Shares granted | (4,032) |
Shares cancelled/expired | 886 |
Shares withheld for taxes | 2,258 |
Available at end of fiscal year | 32,901 |
RSU Activity | RSU activity for the year ended January 31, 2021 was as follows:
(in thousands, except per share data) | Number of Units |  | Weighted-Average Grant Date Fair Value
Unvested at January 31, 2020 | 13,859 |  |  | $ | 46.28 |
Granted | 4,022 |  |  | 144.80 |
Vested | (6,318) |  |  | 44.67 |
Canceled | (977) |  |  | 53.81 |
Unvested at January 31, 2021 | 10,586 |  |  | $ | 83.98 |
Options Activity | Option activity for the year ended January 31, 2021 was as follows:
(in thousands, except per share data and years) | Number of Options |  | Weighted-Average Exercise Price Per Share |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at January 31, 2020 | 6,882 |  |  | $ | 14.39 |  |  | 5.38 |  | $ | 441,247 |
Issued as consideration for acquisition | 9 |  |  | 22.22 |  |  |  |  |
Exercised | (2,072) |  |  | 11.71 |  |  |  |  |
Canceled/expired | (21) |  |  | 18.09 |  |  |  |  |
Outstanding at January 31, 2021 | 4,798 |  |  | $ | 15.55 |  |  | 5.03 |  | $ | 1,042,879 |
Vested and expected to vest at January 31, 2021 | 4,798 |  |  | $ | 15.55 |  |  | 5.03 |  | $ | 1,042,801 |
Exercisable at January 31, 2021 | 4,761 |  |  | $ | 15.54 |  |  | 5.02 |  | $ | 1,034,740 |
ESPP Valuation Assumptions | We calculated the fair value of the ESPP purchase right using the Black-Scholes option-pricing model, based on the following assumptions:
| Year Ended January 31,
| 2021 |  | 2020 |  | 2019
Risk-free interest rate | 0.11% - 0.17% |  | 1.92% - 2.52 % |  | 2.33 %
Expected dividend yield | — | % |  | — | % |  | — | %
Expected life of purchase right (in years) | 0.5 |  | 0.5 |  | 0.5
Expected volatility | 47% - 58% |  | 39% - 52 % |  | 40 %
Weighted-average grant date fair value per share | $90.15 - $221.20 |  | $ 14.88 - $18.56 |  | $ 14.24

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