Common Stock, Preferred Stock and Equity Plans (Tables)
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12 Months Ended |
Dec. 31, 2020 |
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| Equity [Abstract] |
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| Schedule of Stock and Stock Equity Plans |
The following table contains information about the Company’s equity plans: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As of December 31, 2020 | Title of Plan | | Group Eligible | | Type of Award Granted | | Awards Outstanding | | Additional Awards Authorized for Grant | 2013 Stock and Option Plan | | Employees, Non-employee Directors and Consultants | | NSO,
RS, RSU and PSU | | 7,231,859 | | | 13,385,321 | | | 2006 Stock and Option Plan | | Employees, Non-employee Directors and Consultants | | NSO,
RS and RSU | | 383,818 | | | — | | | | | | Total | | 7,615,677 | | | 13,385,321 | |
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| Outstanding and Vested Options |
The following table summarizes information related to the outstanding and exercisable options during the year ended December 31, 2020: | | | | | | | | | | | | | | | | | | | | | | | | | Stock Options | | Weighted-average Exercise Price | | Weighted-average Remaining Contractual Life | | Aggregate Intrinsic Value | | (in thousands) | | (per share) | | (in years) | | (in thousands) | | Outstanding at December 31, 2019 | 6,272 | | | $ | 134.92 | | | | | | | Granted | 23 | | | $ | 286.27 | | | | | | | Exercised | (1,883) | | | $ | 121.42 | | | | | | | Forfeited | (174) | | | $ | 165.39 | | | | | | Expired | — | | | $ | — | | | | | | | Outstanding at December 31, 2020 | 4,238 | | | $ | 140.47 | | | 6.34 | | $ | 397,211 | | | Exercisable at December 31, 2020 | 2,894 | | | $ | 125.83 | | | 5.73 | | $ | 313,936 | |
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| Stock Options Outstanding and Exercisable |
The following table summarizes information about stock options outstanding and exercisable at December 31, 2020: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Options Outstanding | | Options Exercisable | Range of Exercise Prices | | Number Outstanding | | Weighted-average Remaining Contractual Life | | Weighted-average Exercise Price | | Number Exercisable | | Weighted-average Exercise Price | | | (in thousands) | | (in years) | | (per share) | | (in thousands) | | (per share) | $36.28–$40.00 | | 60 | | | 0.85 | | $ | 38.06 | | | 60 | | | $ | 38.06 | | $40.01–$60.00 | | 154 | | | 1.73 | | $ | 47.07 | | | 154 | | | $ | 47.07 | | $60.01–$80.00 | | 97 | | | 3.25 | | $ | 74.53 | | | 97 | | | $ | 74.54 | | $80.01–$100.00 | | 991 | | | 5.34 | | $ | 88.93 | | | 937 | | $ | 89.07 | | $100.01–$120.00 | | 127 | | | 4.07 | | $ | 109.24 | | | 127 | | | $ | 109.22 | | $120.01–$140.00 | | 271 | | | 4.71 | | $ | 129.49 | | | 270 | | | $ | 129.50 | | $140.01–$160.00 | | 715 | | | 7.05 | | $ | 155.49 | | | 415 | | | $ | 155.42 | | $160.01–$180.00 | | 578 | | | 7.47 | | $ | 168.40 | | | 312 | | | $ | 166.01 | | $180.01–$200.00 | | 1,222 | | | 7.85 | | $ | 185.31 | | | 499 | | | $ | 184.92 | | $200.01–$286.27 | | 23 | | | 9.42 | | $ | 286.27 | | | 23 | | | $ | 286.27 | | Total | | 4,238 | | | 6.34 | | $ | 140.47 | | | 2,894 | | | $ | 125.83 | |
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| Restricted Stock and Restricted Stock Units Activity |
The following table summarizes the restricted stock unit and restricted stock activity of the Company during the year ended December 31, 2020: | | | | | | | | | | | | | | | | | | | | | | | | | Restricted Stock Units (excluding PSUs) | | Restricted Stock | | Number of Shares | | Weighted-average
Grant-date Fair Value | | Number of Units | | Weighted-average Grant-date Fair Value | | (in thousands) | | (per share) | | (in thousands) | | (per share) | | Unvested at December 31, 2019 | 3,131 | | | $ | 163.61 | | | 92 | | | $ | 91.97 | | | Granted | 1,244 | | | $ | 258.45 | | | — | | | $ | — | | | Vested | (1,443) | | | $ | 159.10 | | | (92) | | | $ | 91.97 | | Cancelled | (210) | | | $ | 193.84 | | | — | | | $ | — | | | Unvested at December 31, 2020 | 2,722 | | | $ | 206.99 | | | — | | | $ | — | |
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| PSU Activity |
The following table summarizes the PSU activity of the Company during the year ended December 31, 2020: | | | | | | | | | | | | | Performance-Based RSU | | Number of Units | | Weighted-average
Grant-date
Fair Value | | (in thousands) | | (per share) | | Unvested at December 31, 2019 (1) | 734 | | | $ | 143.21 | | Granted (2) | 547 | | | $ | 241.38 | | Vested | (577) | | | $ | 114.11 | | Cancelled | (48) | | | $ | 194.46 | | | Unvested at December 31, 2020 | 656 | | | $ | 202.06 | | | | | | | (1) “Unvested” represents the Company’s PSUs at target to the extent performance has not been certified plus the actual number of shares that continue to be subject to service conditions for which the performance has been achieved and certified. | | (2) “Granted” represents (i) the target number of shares issuable for grants during 2020 and (ii) any change in the number of shares issuable pursuant to outstanding PSUs based on performance certification during 2020. |
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| Shares Issued Under Employee Stock Purchase Plan |
In 2020, the following shares were issued to employees under the ESPP: | | | | | | | Year Ended December 31, 2020 | | (in thousands,
except per share amount) | | Number of shares | 203,055 | | Average price paid per share | $ | 167.93 | |
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