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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Per share or per unit amount of equity securities issued.

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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended	9 Months Ended
	Nov. 12, 2021	Oct. 13, 2021	Nov. 17, 2021	Sep. 30, 2021	Sep. 30, 2021	Oct. 01, 2021	Dec. 31, 2020
Subsequent Events
Options granted (in shares)				0	67,232
Weighted average exercise price (in dollars per share)					$ 2.25
Conversion of preferred stock into SAFE					$ 8.9
Common stock shares reserved for conversion				20,375,329	20,375,329		17,317,608
Common stock, shares authorized				70,000,000	70,000,000		58,000,000
Common stock, par value (in dollars per share)				$ 0.001	$ 0.001		$ 0.001
ESPP
Subsequent Events
Common stock shares reserved for conversion				209,532	209,532
Subsequent Event
Subsequent Events
Conversion of preferred stock into common stock		15,906,537
Warrants exercised		147,702
Preferred stock, par value (in dollars per share)		$ 0.001
Preferred stock shares authorized		10,000,000
Common stock, shares authorized		250,000,000				80,000,000
Common stock, par value (in dollars per share)		$ 0.001
Subsequent Event \| 2021 Plan \| Certain executives and directors
Subsequent Events
Options granted (in shares)			1,942,804
Subsequent Event \| IPO
Subsequent Events
Shares issued		3,768,116
Gross proceeds from IPO		$ 45.2
Offering price per share		$ 12.00
Net proceeds from IPO		$ 38.1
Conversion of preferred stock into common stock		15,906,537
Shares converted into common stock		931,485
Conversion of preferred stock into SAFE		$ 8.9
Warrants exercised		147,702
Subsequent Event \| Over-Allotment Option
Subsequent Events
Shares issued	565,217
Gross proceeds from IPO	$ 6.8
Net proceeds from IPO	$ 6.3