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Stockholders' Equity (Tables) | 6 Months Ended
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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, 2021 | 20,145,360 |  |  | 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, 2022 | 18,529,346 |  |  | 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 Ended |  | Six 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 exercised | 11,250 |  |  | 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 Ended |  | Six Months Ended
| June 30, 2022 |  | June 30, 2021 |  | June 30, 2022 |  | June 30, 2021
Dividend yield | — | % |  | — | % |  | — | % |  | — | %
Expected volatility | 49 | % |  | 36 | % |  | 38% - 49% |  | 36% - 41%
Risk-free interest rate | 2.57 | % |  | 1.62 | % |  | 1.71% - 2.57% |  | 1.08% - 1.62%
Suboptimal exercise factor | 4.71 |  |  | 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 |

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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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