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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2023
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, | 2023 |  | 2022 |  | 2021
Basic weighted average shares outstanding | 45,636,649 |  |  | 45,719,906 |  |  | 46,535,001 |
Effect of potential dilutive shares (1): |  |  |  |  |
Warrants | — |  |  | — |  |  | — |
Restricted stock units | 164,752 |  |  | 144,194 |  |  | — |
Performance stock units (2) | 739,305 |  |  | 550,730 |  |  | — |
Diluted weighted average shares outstanding | 46,540,706 |  |  | 46,414,830 |  |  | 46,535,001 |
Anti-dilutive shares excluded from the above reconciliation |  |  |  |  |
Warrants | — |  |  | 4,877,617 |  |  | 4,877,653 |
Restricted stock units | 135,058 |  |  | 177,119 |  |  | 475,333 |
Performance stock units (2) | — |  |  | — |  |  | 700,915 |
(1)For the year ended December 31, 2021, 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, |  | 2023 |  | 2022 |  | 2021
Net income (loss) attributable to common stockholders |  | $ | 4 |  |  | $ | 522 |  |  | $ | (17) |
Adjustment to redemption value (ASC 480) |  | 5 |  |  | 3 |  |  | (12) |
Numerator of basic and diluted EPS |  | $ | 8 |  |  | $ | 525 |  |  | $ | (28) |
Per Share: |  |  |  |  |  |
Basic |  | $ | 0.18 |  |  | $ | 11.48 |  |  | $ | (0.61) |
Diluted |  | $ | 0.18 |  |  | $ | 11.31 |  |  | $ | (0.61) |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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