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Summary of Significant Accounting Policies - Reconciliation of the Numerator and Denominator Used in the Calculation of Basic and Diluted Net Income (Loss) Per Share (Details) - shares shares in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Weighted-average shares outstanding: |  |  |  |  |  |
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders—basic (in shares) | 135,673 | 94,834 | 122,595 | 94,722 | 94,803 | 94,530
Dilutive effect of shares issuable upon conversion of preferred stock (in shares) | 0 | 0 | 9,463 | 0 |  |
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders—diluted (in shares) | 135,673 | 94,834 | 138,639 | 94,722 | 94,803 | 94,530
Stock options outstanding |  |  |  |  |  |
Weighted-average shares outstanding: |  |  |  |  |  |
Dilutive effect of share equivalents resulting (in shares) | 0 | 0 | 6,417 | 0 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Weighted-average shares outstanding: |  |  |  |  |  |
Dilutive effect of share equivalents resulting (in shares) | 0 | 0 | 164 | 0 |  |

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