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SHARE-BASED AWARDS (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of the Stock Option Activity | A summary of the stock option activity for the year ended December 31, 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 | (2,959) |  |  | 1.35 |  |  |  |  |
Forfeited | (447) |  |  | 6.60 |  |  |  |  |
Expired | (428) |  |  | 2.42 |  |  |  |  |
Balance – December 31, 2022 | 10,712 |  |  | 2.13 |  |  | 3.5 |  | $ | 1 |
Exercisable – December 31, 2022 | 10,668 |  |  | 2.12 |  |  | 3.5 |  | $ | 1 |
Summary of the RSU Activity | A summary of the RSU activity for the year ended December 31, 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 | 45,373 |  |  | 4.85 |
Vested | (17,280) |  |  | 12.15 |
Forfeited | (26,992) |  |  | 17.62 |
Unvested and outstanding – December 31, 2022 | 54,547 |  |  | $ | 10.29 |
Summary of the Restricted Shares Activity | A summary of the Restricted Shares activity for the year ended December 31, 2022 is as follows:
| Number of Restricted Shares (in thousands) |  | Average Grant-Date Fair Value
Unvested – December 31, 2021 | 692 |  |  | $ | 3.91 |
Vested | (623) |  |  | 4.01 |
Forfeited | (69) |  |  | 3.02 |
Unvested – December 31, 2022 | — |  |  | $ | — |
Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | 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.
| Offering Period
| September 1, 2022 - February 28, 2023 |  | March 1, 2022 - August 31, 2022
Fair value | $ | 1.78 |  |  | $ | 3.55 |
Volatility | 94.5 | % |  | 101.4 | %
Risk-free rate | 3.34 | % |  | 0.60 | %
Expected life (in years) | 0.5 |  | 0.5
Expected dividend | $ | — |  |  | $ | — |
Summary of Stock-Based Compensation Expense in the Statements of Operations | The following table summarizes total stock-based compensation expense by function as presented in the consolidated statements of operations for the years ended December 31, 2022, 2021 and 2020, as follows (in millions):
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
General and administrative | $ | 109 |  |  | $ | 463 |  |  | $ | 33 |
Sales, marketing and operations | 18 |  |  | 13 |  |  | 1 |
Technology and development | 44 |  |  | 60 |  |  | 4 |
Total stock-based compensation expense | $ | 171 |  |  | $ | 536 |  |  | $ | 38 |
Summary of Assumptions Used in the Black-Scholes Model for Employee and non-Employee Stock Options | The Black-Scholes Model used to value stock options incorporates the following assumptions:
|  |  |  |  | Year Ended December 31,
|  |  |  |  | 2021
Fair value |  |  |  |  | $ | 15.00 |
Volatility |  |  |  |  | 73 | %
Risk-free rate |  |  |  |  | 1.09 | %
Expected life (in years) |  |  |  |  | 7
Expected dividend |  |  |  |  | $ | — |

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