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Stockholders' Equity (Tables)
12 Months Ended
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)20212020
RSUs outstanding10,962 14,246 
Options issued and outstanding4,798 6,882 
Remaining shares available for future issuance under the Equity Incentive Plans32,901 24,726 
Remaining shares available for future issuance under the ESPP6,329 4,985 
Total shares of common stock reserved54,990 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 year24,726 
Awards authorized9,063 
Shares granted(4,032)
Shares cancelled/expired886 
Shares withheld for taxes2,258 
Available at end of fiscal year32,901 
RSU Activity
RSU activity for the year ended January 31, 2021 was as follows:
(in thousands, except per share data)Number of UnitsWeighted-Average Grant Date Fair Value
Unvested at January 31, 202013,859 $46.28 
Granted4,022 144.80 
Vested(6,318)44.67 
Canceled(977)53.81 
Unvested at January 31, 202110,586 $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 OptionsWeighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Term (Years)Aggregate Intrinsic Value
Outstanding at January 31, 20206,882 $14.39 5.38$441,247 
Issued as consideration for acquisition22.22 
Exercised(2,072)11.71 
Canceled/expired(21)18.09 
Outstanding at January 31, 20214,798 $15.55 5.03$1,042,879 
Vested and expected to vest at January 31, 20214,798 $15.55 5.03$1,042,801 
Exercisable at January 31, 20214,761 $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,
202120202019
Risk-free interest rate
0.11% - 0.17%
1.92% - 2.52 %
2.33 %
Expected dividend yield— %— %— %
Expected life of purchase right (in years)0.50.50.5
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