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Equity Incentive Plans - Summary of Stock Option Activity Under 2009 Plan and 2019 Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Shares Subject to Outstanding Stock Options, Stock Options outstanding, Beginning Balance 12,875,045
Shares Subject to Outstanding Stock Options, Stock Options granted 1,008,364
Shares Subject to Outstanding Stock Options, Stock Options forfeited (696,147)
Shares Subject to Outstanding Stock Options, Stock Options expired (319,633)
Shares Subject to Outstanding Stock Options, Stock Options exercised (45,900)
Shares Subject to Outstanding Stock Options, Stock Options outstanding, Ending Balance 12,821,729
Shares Subject to Outstanding Stock Options, Stock Options vested and exercisable 9,795,534
Weighted Average Exercise Price per Share, Stock Options outstanding, Beginning Balance $ 15.9
Weighted Average Exercise Price per Share, Stock Options granted 3.99
Weighted Average Exercise Price per Share, Stock Options forfeited 11.57
Weighted Average Exercise Price per Share, Stock Options expired 23.83
Weighted Average Exercise Price per Share, Stock Options exercised 1.61
Weighted Average Exercise Price per Share, Stock Options outstanding, Ending Balance 15.05
Weighted Average Exercise Price per Share, Stock Options vested and exercisable $ 16.09
Aggregate Intrinsic Value, Stock Option outstanding $ 120
Aggregate Intrinsic Value, Stock Options vested and exercisable $ 120