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Stock-Based Compensation and Employee Stock Purchase Program - Weighted-Average Fair Value Assumption of Stock Option Awards (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)					7 years 21 days	6 years 4 months 24 days
Expected volatility					124.00%	122.00%
Risk-free interest rate					3.61%	2.61%
Dividend yield					0.00%	0.00%
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	8 years 14 days	0 years	8 years 14 days	7 years 21 days
Expected volatility	101.31%	0.00%	101.31%	124.00%
Risk-free interest rate	3.77%	0.00%	3.77%	3.61%
Dividend yield	0.00%	0.00%	0.00%	0.00%

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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