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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Summary of Reserved Shares of Common Stock | As of September 30, 2021, we have reserved shares of common stock for the following:
Shares issuable upon the exercise of outstanding common stock options and the vesting of outstanding common restricted stock units granted |  |  | 13,645,411 |
Shares available for future grant under the 2019 Equity Incentive Plan |  |  | 23,011,065 |
Shares available for future grant under the Employee Stock Purchase Plan |  |  | 2,804,298 |
Total shares of common stock reserved for future issuance |  |  | 39,460,774 |

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