Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share

The following table provides a reconciliation of the common shares used for basic net income per share to the diluted shares used for diluted net income per share:

Year Ended December 31,	2022	2021	2020
Basic weighted average shares outstanding	45,719,906	46,535,001	46,147,062
Effect of potential dilutive shares (1):
Warrants	—	—	—
Stock options	—	—	—
Restricted stock units	144,194	—	—
Performance stock units (2)	550,730	—	—
Diluted weighted average shares outstanding	46,414,830	46,535,001	46,147,062
Anti-dilutive shares excluded from the above reconciliation
Warrants	4,877,617	4,877,653	4,877,754
Stock options	—	—	16,121
Restricted stock units	177,119	475,333	302,145
Performance stock units (2)	—	700,915	1,002,501

(1)For the years ended years ended December 31, 2021 and 2020, Ambac had a net loss and accordingly excluded all potentially dilutive securities from the determination of diluted loss per share as their impact was anti-dilutive.

(2)Performance stock units are reflected based on the performance metrics through the balance sheet date. Vesting of these units is contingent upon meeting certain performance metrics. Although a portion of these performance metrics have been achieved as of the respective period end, it is possible that awards may no longer meet the metric at the end of the performance period.

Schedule of Earnings Per Share, Basic and Diluted

The following table provides a reconciliation of net income attributable to common stockholders to the numerator in the basic and diluted earnings per share calculation, together with the resulting earnings per share amounts:

Year ended December 31,	2022		2021		2020
Net income (loss) attributable to common stockholders	$	522	$	(17)	$	(437)
Adjustment to redemption value (ASC 480)	3		(12)		—
Numerator of basic and diluted EPS	$	525	$	(28)	$	(437)
Per Share:
Basic	11.48		$	(0.61)	$	(9.47)
Diluted	11.31		$	(0.61)	$	(9.47)