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Net Income Per Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Net Income Per Share | 5. NET INCOME PER SHARE As of September 30, 2020, 45,809,139 shares of Ambac's common stock (par value $0.01) and warrants entitling holders to acquire up to 4,877,749 shares of new common stock at an exercise price of $16.67 per share were issued and outstanding. Common shares outstanding increased by 253,739 during the nine months ended September 30, 2020, primarily due to settlements of employee restricted and performance stock units. Basic net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding and vested restricted stock units (together, "Basic Weighted Average Shares Outstanding"). Diluted net income per share is computed by dividing net income attributable to common stockholders by the Basic Weighted Average Shares Outstanding plus all potential dilutive common shares outstanding during the period. All potential dilutive common shares outstanding consider common stock deliverable pursuant to warrants, vested and unvested options, unvested restricted stock units and performance stock units granted under existing compensation plans. 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:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Basic weighted average shares outstanding |  | 46,178,730 |  |  | 45,997,694 |  |  | 46,135,399 |  |  | 45,939,284 |
Effect of potential dilutive shares (1): |  |  |  |  |  |  |  |
Stock options |  | — |  |  | — |  |  | — |  |  | — |
Warrants |  | — |  |  | 450,384 |  |  | — |  |  | — |
Restricted stock units |  | — |  |  | 78,751 |  |  | — |  |  | — |
Performance stock units (2) |  | — |  |  | 493,229 |  |  | — |  |  | — |
Diluted weighted average shares outstanding |  | 46,178,730 |  |  | 47,020,058 |  |  | 46,135,399 |  |  | 45,939,284 |
Anti-dilutive shares excluded from the above reconciliation: |  |  |  |  |  |  |  |
Stock options |  | 16,667 |  |  | 16,667 |  |  | 16,667 |  |  | 16,667 |
Warrants |  | 4,877,749 |  |  | — |  |  | 4,877,754 |  |  | 4,877,783 |
Restricted stock units |  | 333,526 |  |  | — |  |  | 286,279 |  |  | 249,025 |
Performance stock units (2) |  | 972,138 |  |  | — |  |  | 932,777 |  |  | 748,700 |
(1) For the three and nine months ended September 30, 2020, and the nine months ended September 30, 2019, 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.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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