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Net (Loss) Income Attributable to Penumbra, Inc. Per Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Net (Loss) Income Attributable to Penumbra, Inc. Per Share | 12. Net Income Attributable to Penumbra, Inc. Per Share The Company computed basic net income 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 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 using the treasury stock method. For the purposes of this calculation, stock options, restricted stock, restricted stock units and stock sold through the Company’s employee stock purchase plan are considered common stock equivalents. A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net income attributable to Penumbra, Inc. per share is as follows (in thousands, except share and per share amounts):
|  | Three Months Ended March 31, |  |
|  | 2021 |  | 2020 |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net income attributable to Penumbra, Inc. |  | $ | 11,836 |  |  | $ | 1,425 |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |
Weighted average shares used to compute net income attributable to common stockholders: |  |  |  |  |  |  |  |
Basic |  | 36,455,712 |  |  | 35,042,912 |  |  |  |  |
Potential dilutive stock-based options and awards |  | 1,077,808 |  |  | 1,319,814 |  |  |  |  |
Diluted |  | 37,533,520 |  |  | 36,362,726 |  |  |  |  |
Net income attributable to Penumbra, Inc. per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.32 |  |  | $ | 0.04 |  |  |  |  |
Diluted |  | $ | 0.32 |  |  | $ | 0.04 |  |  |  |  |
For the three months ended March 31, 2021 and 2020, outstanding stock-based awards of 22 thousand and 18 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.

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