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Accounting for Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of Share-based Compensation Expense

The following table reflects the impact of total compensation expense related to stock-based equity plans on the reported operating results for the respective periods (in millions):

		Three Months Ended
		March 31,
		2025				2024
Effect on income before income taxes		$	(4	)		$	(6	)
Effect on net loss		$	(3	)		$	(5	)

Schedule of Share-based Payment Awards, Stock Options, Valuation Assumptions

The fair value of stock options was estimated using the Black Scholes option pricing model with the following assumptions and weighted-average fair values during the three months ended March 31, 2025 and 2024:

		Three Months Ended March 31,
		2025		2024
Expected volatility		88.7%		90.1%
Expected dividends		—		—
Expected term		6 years		6 years
Risk-free interest rate		4.0%		4.3%

Schedule of Share-based Compensation, Stock Options, Activity

Options outstanding and exercisable under the 2009 Plan as of March 31, 2025, and changes during the three-month period following December 31, 2024, was as follows (in millions, except share and per share data):

										Weighted-		Aggregate
						Weighted-				Average		Intrinsic
						Average				Remaining		Value as of
						Exercise				Contractual		March 31,
		Shares				Price				Term		2025
Outstanding at December 31, 2024			4,490,750			$	6.24
Granted			806,000				3.01
Exercised			—				—
Forfeited and cancelled			(57,000	)			4.43
Outstanding at March 31, 2025			5,239,750			$	5.77			7.2 years		$	—
Exercisable at March 31, 2025			3,591,738			$	6.82			6.2 years		$	—

Schedule of Share-based Compensation, Restricted Stock, Activity

Restricted stock outstanding under the 2009 Plan as of March 31, 2025, and changes during the three-month period following December 31, 2024, was as follows:

						Weighted-
						Average Grant
		Shares				Date Fair Value
Unvested at December 31, 2024			6,509,245			$	5.63
Granted			2,636,000				3.01
Vested			(1,582,989	)			6.56
Forfeited			(1,004,170	)			9.66
Unvested at March 31, 2025			6,558,086				3.74

Schedule of Share-based Compensation, Restricted Stock Units, Activity

RSUs outstanding under the 2009 Plan as of March 31, 2025, and changes during the three-month period following December 31, 2024, was as follows:

						Weighted-
						Average Grant
		Shares				Date Fair Value
Outstanding at December 31, 2024			1,548,316			$	4.49
Granted			777,413				3.01
Vested			(249,998	)			4.80
Forfeited			—				—
Outstanding at March 31, 2025			2,075,731				3.90

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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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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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.

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