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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Summary of Stock Options and SAR Activity | A summary of stock option and SAR activity for the six months ended June 30, 2021 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, 2020 |  | 229 |  |  | 28,734 |  |  | $ | 12.87 |  |  | 4.97 |  | $ | 1,104 |
Granted |  | — |  |  | 945 |  |  | $ | 14.68 |  |  |  |  |
Exercised |  | (48) |  |  | (6,177) |  |  | $ | 12.30 |  |  |  |  |
Canceled and forfeited |  | (2) |  |  | (300) |  |  | $ | 18.24 |  |  |  |  |
As of June 30, 2021 |  | 179 |  |  | 23,202 |  |  | $ | 13.03 |  |  | 4.02 |  | $ | 867 |
Vested and expected to vest as of June 30, 2021 |  | 138 |  |  | 17,773 |  |  | $ | 8.39 |  |  | 3.45 |  | $ | 752 |
Exercisable as of June 30, 2021 |  | 138 |  |  | 17,773 |  |  | $ | 8.39 |  |  | 3.45 |  | $ | 752 |
Schedule of Restricted Stock Units Activity | The following table summarizes the activity related to our RSUs for the six months ended June 30, 2021 (in thousands, except per share amounts):
|  | Number of Shares |  | Weighted-Average Grant-Date Fair Value per Share
Unvested and outstanding as of December 31, 2020 |  | 83,736 |  |  | $ | 34.17 |
Granted |  | 24,573 |  |  | $ | 58.35 |
Vested |  | (18,467) |  |  | $ | 36.67 |
Canceled and forfeited |  | (14,956) |  |  | $ | 36.45 |
Unvested and outstanding as of June 30, 2021 |  | 74,886 |  |  | $ | 41.07 |
Schedule of Stock-Based Compensation Expense by Function | The following table summarizes total stock-based compensation expense by function for the three and six months ended June 30, 2020 and 2021 (in millions):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2020 |  | 2021 |  | 2020 |  | 2021
Operations and support |  | $ | 11 |  |  | $ | 38 |  |  | $ | 36 |  |  | $ | 65 |
Sales and marketing |  | 10 |  |  | 19 |  |  | 24 |  |  | 42 |
Research and development |  | 72 |  |  | 149 |  |  | 239 |  |  | 282 |
General and administrative |  | 38 |  |  | 66 |  |  | 109 |  |  | 164 |
Total |  | $ | 131 |  |  | $ | 272 |  |  | $ | 408 |  |  | $ | 553 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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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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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired 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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