Net Loss Per Share - Schedule of Potentially Anti-dilutive Securities Excluded from Computation of Diluted Weighted Average Shares Outstanding (Details) - shares	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially anti-dilutive securities excluded from computation of diluted weighted average shares outstanding	32,018,165	53,327,867
Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially anti-dilutive securities excluded from computation of diluted weighted average shares outstanding	0	38,147,020
Shares Subject to Outstanding Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially anti-dilutive securities excluded from computation of diluted weighted average shares outstanding	26,045,046	10,974,643
Shares Subject to Outstanding Common Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially anti-dilutive securities excluded from computation of diluted weighted average shares outstanding	1,752,080	1,752,080
Unvested Exercised Options Subject to Repurchase
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially anti-dilutive securities excluded from computation of diluted weighted average shares outstanding	833,931	1,292,707
Unvested Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially anti-dilutive securities excluded from computation of diluted weighted average shares outstanding	497,756	1,161,417
Unvested Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially anti-dilutive securities excluded from computation of diluted weighted average shares outstanding	2,131,436	0
Shares Subject to Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially anti-dilutive securities excluded from computation of diluted weighted average shares outstanding	757,916	0