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Equity Incentive Plans, Employee Stock Purchase Plan and Stock-Based Compensation - Summary of the Status of Call Options (Details) - shares | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 | Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Options vested and exercised | 191,153 | 191,153
Options vested and outstanding | 66,681 |
Options unvested and outstanding | 8,890 | 75,571
Total options granted | 266,724 | 266,724

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