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Equity Awards (Tables)
12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Information About Outstanding And Vested Stock Options
A summary of stock option activity was as follows:
Number of
Shares
Weighted-
Average
Exercise
Price Per Share
Weighted-
Average
Remaining
Contractual
Term
Aggregate
Intrinsic Value
(in thousands)(in years)(in millions)
Outstanding at December 31, 20211,305 $551.39 
Granted
23 $591.66 
Exercised(85)$32.30 $40 
Canceled(6)$66.58 
Outstanding at December 31, 20221,237 $590.36 8.3$43 
Vested and expected to vest as of December 31, 20221,075 $578.24 8.3$43 
Vested and exercisable as of December 31, 2022142 $165.31 5.2$32 
Restricted Stock Unit Table
A summary of RSU activity was as follows:
Number of
Shares
Weighted-Average Grant-Date Fair Value Per Share
(in thousands)
Outstanding at December 31, 20215,808 $416.00 
Granted3,719 $541.24 
Vested(3,075)$389.27 
Forfeited(715)$469.06 
Outstanding at December 31, 20225,737 $505.79 
Expected to vest as of December 31, 20224,983 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
The following assumptions were used in the Black-Scholes options pricing model and the Monte Carlo simulation model, to estimate our stock-based compensation on the date of grant for ESPP, stock options and PRSUs, respectively, as applicable.
 Year Ended December 31,
202220212020
Risk Free Interest Rate
ESPP
0.06% - 2.96%
0.06% - 0.11%
0.11% - 2.04%
Stock Options
2.04%
1.20% - 1.45%
*
PRSU
1.76%
0.19% - 0.20%
**
Expected Term (in years)
ESPP0.50.50.5
Stock Options
10
7.5 - 10
*
Expected Volatility
ESPP
35% - 59%
35% - 60%
30% - 60%
Stock Options40 %
38% - 41%
*
PRSU42 %
41% - 42%
**
* There were no stock option grants in 2020.
** There were no grants with market conditions for the respective fiscal year.