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Net Income (Loss) per Share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Net Income (Loss) per Share | 16. Net Income (Loss) per Share The Company computed basic net income (loss) attributable to Penumbra, Inc. per share based on the weighted average number of shares of common stock outstanding during the period. The Company computed diluted net income (loss) attributable to Penumbra, Inc. per share based on the weighted average number of shares of common stock outstanding plus potentially dilutive common stock equivalents outstanding during the period. For the purposes of this calculation, stock options, restricted stock units, performance stock units and stock sold through the ESPP are considered common stock equivalents. A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net income (loss) attributable to Penumbra, Inc. is as follows (in thousands, except share and per share amounts):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Numerator: |  |  |  |  |  |
Net income (loss) attributable to Penumbra, Inc. |  | $ | 90,954 |  |  | $ | (2,002) |  |  | $ | 5,284 |
Denominator: |  |  |  |  |  |
Weighted average shares used to compute net income (loss) attributable to common stockholders: |  |  |  |  |  |
Basic |  | 38,401,171 |  |  | 37,841,874 |  |  | 36,764,290 |
Potential dilutive stock-based options and awards, as calculated using treasury stock method |  | 815,393 |  |  | — |  |  | 1,116,890 |
Diluted |  | 39,216,564 |  |  | 37,841,874 |  |  | 37,881,180 |
Net income (loss) attributable to Penumbra, Inc. per share from: |  |  |  |  |  |
Basic |  | $ | 2.37 |  |  | $ | (0.05) |  |  | $ | 0.14 |
Diluted |  | $ | 2.32 |  |  | $ | (0.05) |  |  | $ | 0.14 |
For the years ended December 31, 2023 and 2021, outstanding stock-based awards of 11 thousand and 15 thousand shares, respectively, were excluded from the computation of diluted net income attributable to Penumbra, Inc. per share because their effect would have been anti-dilutive. For the year ended December 31, 2022 outstanding stock-based awards of 2.0 million shares were excluded from the computation of diluted net loss attributable to Penumbra, Inc. per share because their effect would have been anti-dilutive.

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