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SHARE-BASED AWARDS (Tables) | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of the Stock Option Activity | A summary of the stock option activity for the six months ended June 30, 2022, is as follows:
| Number of Options (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Balance-December 31, 2021 | 14,546 |  |  | $ | 2.12 |  |  | 4.7 |  | $ | 182 |
Granted | — |  |  | — |  |  |  |  |
Exercised | (2,321) |  |  | 1.33 |  |  |  |  |
Forfeited | (278) |  |  | 4.05 |  |  |  |  |
Expired | (225) |  |  | 0.76 |  |  |  |  |
Balance-June 30, 2022 | 11,722 |  |  | $ | 2.26 |  |  | 4.0 |  | $ | 30 |
Exercisable-June 30, 2022 | 11,119 |  |  | $ | 2.02 |  |  | 3.9 |  | $ | 30 |
Summary of the RSU Activity | A summary of the RSU activity for the six months ended June 30, 2022, is as follows:
| Number of RSUs (in thousands) |  | Weighted- Average Grant-Date Fair Value
Unvested and outstanding-December 31, 2021 | 53,446 |  |  | $ | 17.35 |
Granted | 16,752 |  |  | 8.16 |
Vested | (8,543) |  |  | 10.60 |
Forfeited | (3,832) |  |  | 13.15 |
Unvested and outstanding-June 30, 2022 | 57,823 |  |  | $ | 15.97 |
Summary of the Restricted Shares Activity | A summary of the Restricted Shares activity for the six months ended June 30, 2022 is as follows:
| Number of Restricted Shares (in thousands) |  | Average Grant-Date Fair Value
Unvested-December 31, 2021 | 692 |  |  | $ | 3.91 |
Granted | — |  |  | — |
Vested | (138) |  |  | 3.02 |
Unvested-June 30, 2022 | 554 |  |  | $ | 4.13 |
Summary of Assumptions Used in the Black-Scholes Model for Employee and non-Employee Stock Options | The fair value of ESPP purchase rights is estimated at the date of grant using the Black-Scholes option-pricing valuation model. The following assumptions were applied in the model to estimate the grant-date fair value of the ESPP for the initial offering period that began on March 1, 2022.
| 2022
Fair value | $ | 3.55 |
Volatility | 101.4 | %
Risk-free rate | 0.60 | %
Expected life (in years) | 0.5
Expected dividend | $ | — |
Summary of Stock-Based Compensation Expense in the Statements of Operations | Stock-based compensation expense is allocated based on the cost center to which the award holder belongs. The following table summarizes total stock-based compensation expense by function as presented in the condensed consolidated statements of operations for the three and six months ended June 30, 2022 and 2021, as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
General and administrative | $ | 43 |  |  | $ | 156 |  |  | $ | 94 |  |  | $ | 353 |
Sales, marketing and operations | 5 |  |  | 1 |  |  | 9 |  |  | 8 |
Technology and development | 11 |  |  | 7 |  |  | 23 |  |  | 42 |
Total stock-based compensation expense | $ | 59 |  |  | $ | 164 |  |  | $ | 126 |  |  | $ | 403 |

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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 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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