Stockholders' Equity - Summary of Stock Option Activity (Details) - Equity Incentive Plan $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2026 USD ($) $ / shares shares	Dec. 31, 2025 USD ($) $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares, outstanding beginning balance | shares	10,737,203
Number of shares, granted | shares	2,762,692
Number of shares, exercised | shares	(360,208)
Number of shares, forfeited | shares	(2,480,279)
Number of shares, outstanding ending balance | shares	10,659,408	10,737,203
Number of shares, exercisable | shares	5,844,730
Number of shares, vested and expected to vest | shares	10,659,408
Weighted-average exercise price, outstanding beginning balance | $ / shares	$ 8.22
Weighted-average exercise price, granted | $ / shares	2.13
Weighted-average exercise price, exercised | $ / shares	2.09
Weighted-average exercise price, forfeited | $ / shares	12.73
Weighted-average exercise price, outstanding ending balance | $ / shares	5.8	$ 8.22
Weighted-average exercise price, exercisable | $ / shares	8.37
Weighted-average exercise price, vested and expected to vest | $ / shares	$ 5.8
Weighted-average remaining contractual term (in years), outstanding balance	7 years 4 months 24 days	6 years 7 months 6 days
Weighted-average remaining contractual term (in years), exercisable	6 years 3 months 18 days
Weighted-average remaining contractual term (in years), vested and expected to vest	7 years 4 months 24 days
Aggregate intrinsic value, outstanding balance | $	$ 3,201	$ 134
Aggregate intrinsic value, exercisable | $	1,053
Aggregate intrinsic value, vested and expected to vest | $	$ 3,201