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Net Loss Per Share - Anti-dilutive Effect (Details) - shares | 1 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities |  | 6,124,071 | 28,341,301
Exercise of stock options (in shares) | 135,525 | 156,385 |
Unvested early exercised stock options |  | 53,588 |
Unvested restricted common stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities |  | 542,504 | 762,195
Options to purchase common stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities |  | 5,564,588 | 2,639,009
Exercise of stock options (in shares) |  | 211,621 | 211,621
Employee stock purchase plan contingently issuable |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities |  | 16,979 |
Shares available for future grant under the 2014 Stock Plan |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities |  |  | 1,175,022
Convertible Preferred Stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities |  |  | 23,765,075

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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