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Common Stock, Preferred Stock and Equity Plans (Tables)
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Schedule of Stock and Stock Equity Plans The following table contains information about our equity plans:
As of December 31, 2022
Title of Plan
Group Eligible
Type of Award Granted
Awards Outstanding
Additional Awards Authorized for Grant
(in thousands)
2013 Stock and Option PlanEmployees, Non-employee Directors and ConsultantsNSO, RS, RSU and PSU6,553 19,695 
2006 Stock and Option PlanEmployees, Non-employee Directors and ConsultantsNSO, RS and RSU114 — 
Total
6,667 19,695 
Schedule of Outstanding and Vested Options
The following table summarizes information related to the outstanding and exercisable options during the year ended December 31, 2022:
Stock Options
Weighted-average
Exercise Price
Weighted-average Remaining Contractual Life
Aggregate Intrinsic Value
(in thousands)(per share)(in years)(in millions)
Outstanding at December 31, 20213,611 $141.76 
Granted20 $276.17 
Exercised(1,087)$133.50 
Forfeited(17)$181.49 
Expired
— $— 
Outstanding at December 31, 20222,527 $146.11 4.67$355.6 
Exercisable at December 31, 20222,446 $144.94 4.61$347.1 
Schedule of Stock Options Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable as of December 31, 2022:
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)
$45.11–$100.00
689 3.13$86.05 689 $86.05 
$100.01–$150.00
286 2.58$123.17 286 $123.17 
$150.01–$200.00
1,482 5.61$173.26 1,401$172.78 
$200.01–$286.27
70 8.33$256.44 70 $256.44 
Total
2,527 4.67$146.11 2,446 $144.94 
Schedule of Restricted Stock and Restricted Stock Units Activity
The following table summarizes our restricted stock unit activity during the year ended December 31, 2022:
Restricted Stock Units (excluding PSUs)
Number of Shares
Weighted-average
Grant-date Fair Value
(in thousands)(per share)
Unvested at December 31, 20212,909 $213.17 
Granted1,710 $258.39 
Vested(1,445)$209.08 
Cancelled
(261)$228.88 
Unvested at December 31, 20222,913 $240.54 
Schedule of PSU Activity
The following table summarizes our PSU activity during the year ended December 31, 2022:
Performance-Based RSU
Number of Units
Weighted-average
Grant-date Fair Value
(in thousands)(per share)
Unvested at December 31, 2021 (1)1,078 $215.85 
Granted (2)608 $247.26 
Vested(426)$203.75 
Cancelled
(33)$222.16 
Unvested at December 31, 20221,227 $226.75 
(1) “Unvested” represents our 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 2022 and (ii) any change in the number of shares issuable pursuant to outstanding PSUs based on performance certification during 2022.
Schedule of Shares Issued Under Employee Stock Purchase Plan
In 2022, the following shares were issued to employees under the ESPP:
Year Ended December 31, 2022
Number of shares (in thousands)261 
Average price paid per share$161.74