Share-Based Compensation - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Share-Based Compensation
Outstanding beginning balance (in shares)	7,049,290
Granted (in shares)	1,605,070
Exercised (in shares)	(306,470)
Forfeited and expired (in shares)	(22,015)
Outstanding ending balance (in shares)	8,325,875		7,049,290
Exercisable (in shares)	3,703,963
Weighted Average Exercise Price Per Share ,Outstanding beginning balance	$ 0.82
Weighted Average Exercise Price Per Share , Granted	1.51
Weighted Average Exercise Price Per Share ,Exercised	0.27
Weighted Average Exercise Price Per Share , Forfeited and expired	0.27
Weighted Average Exercise Price Per Share , Outstanding ending balance	0.97		$ 0.82
Weighted Average Exercise Price Per Share , Exercisable	$ 0.63
Weighted- Average Contractual Life (in years) , Outstanding	7 years 11 months 19 days		8 years 2 months 23 days
Weighted- Average Contractual Life (in years) , Exercisable	6 years 8 months 8 days
Aggregate Intrinsic Value beginning balance	$ 2,017
Aggregate Intrinsic Value , Exercised	350	$ 1,700
Aggregate Intrinsic Value ending balance	1,206		$ 2,017
Aggregate Intrinsic Value , Exercisable	$ 1,145

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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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Number of options outstanding, including both vested and non-vested options.

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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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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Number of share options (or share units) exercised during the current period.

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