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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2022
Stockholders' Equity Note [Abstract]  
Summary of Activity Related to Stock Option Plans
A summary of the activities related to the Company’s stock option plans is as follows:
Options Outstanding
Shares
Available
for Grant
Number of
Shares
Weighted-
Average
Exercise Price
(per share)
Balances as of December 31, 202120,145,360 17,595,851 $219.83 
Granted
(1,616,014)1,616,014 306.48
Exercised
— (742,484)30.62 
Expired
— (3,185)27.24 
Balances as of June 30, 202218,529,346 18,466,196 $235.06 
Summary of Amounts Related to Option Exercises
A summary of the amounts related to option exercises, is as follows:
Three Months EndedSix Months Ended
June 30,
2022
June 30,
2021
June 30,
2022
June 30,
2021
(in thousands)
Total intrinsic value of options exercised$83,030 $90,290 $197,792 $318,310 
Cash received from options exercised11,250 19,749 24,928 67,820 
Summary of Assumptions Used to Value Stock Option Grants Using Lattice-Binomial Model The following table summarizes the assumptions used to value option grants using the lattice-binomial model and the valuation data:
Three Months EndedSix Months Ended
June 30,
2022
June 30,
2021
June 30,
2022
June 30,
2021
Dividend yield— %— %— %— %
Expected volatility49 %36 %
38% - 49%
36% - 41%
Risk-free interest rate2.57 %1.62 %
1.71% - 2.57%
1.08% - 1.62%
Suboptimal exercise factor4.71 3.82 4.71 
3.81 - 3.82
Weighted-average fair value (per share)$138 $241 $167 $254 
Total stock-based compensation expense (in thousands)$150,392 $101,583 $269,601 $208,813 
Total income tax impact on provision (in thousands)$33,335 $22,832 $59,748 $46,911