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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2022
Equity [Abstract] |
Summary of Stock Options and SAR Activity | A summary of stock option and SAR activity for the three months ended March 31, 2022 is as follows (in millions, except share amounts which are reflected in thousands, per share amounts, and years):
|  | SARs Outstanding Number of SARs |  | Options Outstanding Number of Shares |  | Weighted-Average Exercise Price Per Share |  | Weighted-Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value
As of December 31, 2021 |  | 157 |  |  | 24,253 |  |  | $ | 11.84 |  |  | 4.35 |  | $ | 735 |
Granted |  | 4 |  |  | 421 |  |  | $ | 33.89 |  |  |  |  |
Exercised |  | (3) |  |  | (999) |  |  | $ | 5.20 |  |  |  |  |
Canceled and forfeited |  | — |  |  | (88) |  |  | $ | 14.17 |  |  |  |  |
As of March 31, 2022 |  | 158 |  |  | 23,587 |  |  | $ | 12.51 |  |  | 4.10 |  | $ | 558 |
Vested and expected to vest as of March 31, 2022 |  | 141 |  |  | 17,045 |  |  | $ | 8.31 |  |  | 3.36 |  | $ | 473 |
Exercisable as of March 31, 2022 |  | 141 |  |  | 17,045 |  |  | $ | 8.31 |  |  | 3.36 |  | $ | 473 |
Schedule of Restricted Stock Units Activity | The following table summarizes the activity related to our RSUs for the three months ended March 31, 2022 (in thousands, except per share amounts):
|  | Number of Shares |  | Weighted-Average Grant-Date Fair Value per Share
Unvested and outstanding as of December 31, 2021 |  | 71,461 |  |  | $ | 41.91 |
Granted |  | 59,266 |  |  | $ | 33.65 |
Vested |  | (9,699) |  |  | $ | 39.24 |
Canceled and forfeited |  | (4,073) |  |  | $ | 39.87 |
Unvested and outstanding as of March 31, 2022 |  | 116,955 |  |  | $ | 37.99 |
Schedule of Stock-Based Compensation Expense by Function | The following table summarizes total stock-based compensation expense by function (in millions):
|  | Three Months Ended March 31, |  |
|  | 2021 |  | 2022 |  |  |  |
Operations and support |  | $ | 28 |  |  | $ | 33 |  |  |  |  |
Sales and marketing |  | 22 |  |  | 22 |  |  |  |  |
Research and development |  | 133 |  |  | 196 |  |  |  |  |
General and administrative |  | 98 |  |  | 108 |  |  |  |  |
Total |  | $ | 281 |  |  | $ | 359 |  |  |  |  |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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