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SHARE-BASED AWARDS (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of the Stock Option Activity

A summary of the stock option activity for the year ended December 31, 2023, 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, 2022			10,712						$	2.13					3.5						$	1
Granted			—						—
Exercised			(2,535)						1.07
Expired			(357)						2.87
Balance – December 31, 2023			7,820						2.44						3.3						$	16
Exercisable – December 31, 2023			7,820						2.44						3.3						$	16

Summary of the RSU Activity

A summary of the RSU activity for the year ended December 31, 2023, is as follows:

			Number of RSUs (in thousands)						Weighted- Average Grant-Date Fair Value
Unvested and outstanding – December 31, 2022			54,547						$	10.29
Granted			56,065						2.12
Vested			(35,776)						5.05
Forfeited			(13,940)						11.02
Unvested and outstanding – December 31, 2023			60,896						$	4.05

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.

			Year Ended December 31, 2023			Year Ended December 31, 2022
Fair value			$0.64 - $2.13			$1.78- $3.55
Volatility			101.8% - 119.1%			94.5% - 101.4%
Risk-free rate			5.06% - 5.47%			0.60%- 3.34%
Expected life (in years)			0.5 - 1.0			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, 2023, 2022 and 2021, as follows (in millions):

			Year Ended December 31,
			2023						2022						2021
General and administrative			$	63					$	109					$	463
Sales, marketing and operations			16						18						13
Technology and development			47						44						60
Total stock-based compensation expense			$	126					$	171					$	536

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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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.

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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.

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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.

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