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SHARE-BASED AWARDS (Tables)

12 Months Ended

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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