Net Loss Per Share Attributable to Common Stockholders - Potentially dilutive securities excluded from computation (Details) - shares	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net Loss Per Share Attributable to Common Stockholders
Potential dilutive shares excluded from computation of diluted net loss per share	13,506,570	33,054,703
Employee Stock Option
Net Loss Per Share Attributable to Common Stockholders
Potential dilutive shares excluded from computation of diluted net loss per share	13,245,589	5,565,543
Unvested restricted common stock and early exercised stock options
Net Loss Per Share Attributable to Common Stockholders
Potential dilutive shares excluded from computation of diluted net loss per share	102,950	275,295
Common stock issuable under the 2024 ESPP
Net Loss Per Share Attributable to Common Stockholders
Potential dilutive shares excluded from computation of diluted net loss per share	158,031
Redeemable convertible preferred stock issued and outstanding, as converted
Net Loss Per Share Attributable to Common Stockholders
Potential dilutive shares excluded from computation of diluted net loss per share		27,213,865