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Common Stock, Preferred Stock and Equity Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
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 ConsultantsNSO,
RS, RSU and PSU		7,231,859 13,385,321 
2006 Stock and Option PlanEmployees, Non-employee Directors and ConsultantsNSO,
RS and RSU		383,818 — 
Total
7,615,677 13,385,321 
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, 20196,272 $134.92 
Granted23 $286.27 
Exercised(1,883)$121.42 
Forfeited(174)$165.39 
Expired
— $— 
Outstanding at December 31, 20204,238 $140.47 6.34$397,211 
Exercisable at December 31, 20202,894 $125.83 5.73$313,936 
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 
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, 20193,131 $163.61 92 $91.97 
Granted1,244 $258.45 — $— 
Vested(1,443)$159.10 (92)$91.97 
Cancelled
(210)$193.84 — $— 
Unvested at December 31, 20202,722 $206.99 — $— 
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, 2020656 $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.
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 shares203,055
Average price paid per share$167.93