Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Number of Shares, Options outstanding as of December 31, 2024	1,144,690
Number of Shares, Options granted	939,907
Number of Shares, Options outstanding as of September 30, 2025	2,084,597	1,144,690
Number of Shares, Vested and expected to vest as of September 30, 2025	2,084,597
Number of Shares, Exercisable as of September 30, 2025	581,823
Weighted Average Exercise Price Per Share, Options outstanding as of December 31, 2024	$ 0.81
Weighted Average Exercise Price Per Share, Options granted	6.96
Weighted Average Exercise Price Per Share, Options outstanding at September 30, 2025	3.58	$ 0.81
Weighted Average Exercise Price Per Share, Options Vested and expected to vest as of September 30, 2025	3.58
Weighted Average Exercise Price Per Share, Options Exercisable as of September 30, 2025	$ 1.05
Weighted Average Remaining Contractual Term (in years), Options outstanding	8 years 11 months 19 days	9 years 2 months 23 days
Weighted Average Remaining Contractual Term (in years), Vested and expected to vest as of September 30, 2025	8 years 11 months 19 days
Weighted Average Remaining Contractual Term (in years), Exercisable as of September 30, 2025	8 years 4 months 6 days
Aggregate Intrinsic Value, Options outstanding at December 31, 2024	$ 20,160
Aggregate Intrinsic Value, Options outstanding at September 30, 2025	5,874	$ 20,160
Aggregate Intrinsic Value, Vested and expected to vest as of September 30, 2025	5,874
Aggregate Intrinsic Value, Exercisable as of September 30, 2025	$ 2,790

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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