Net Loss Per Share - Anti-dilutive Effect (Details) - shares	1 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities		8,857,317	6,124,071
Exercise of stock options (in shares)	135,525	108,459
Unvested early exercised stock options		25,629	25,629
Unvested restricted common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities		345,230	542,504
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities		8,329,948	5,564,588
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		182,139	16,979