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Equity Incentive Plans - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Number of shares, Beginning balance	8,152,093
Number of shares, Stock options granted	2,418,450
Number of shares, Stock options exercised	(55,888)
Number of shares, Stock options forfeited	(1,179,453)
Number of shares, Ending balance	9,335,202	8,152,093
Number of shares, Exercisable	4,784,184
Weighted- average exercise price per share, Beginning balance	$ 11.92
Weighted- average exercise price per share, Stock options granted	5.39
Weighted- average exercise price per share, Stock options exercised	1.99
Weighted average exercise price per share, Stock options forfeited	10.61
Weighted- average exercise price per share, Ending balance	10.45	$ 11.92
Weighted- average exercise price per share, Exercisable	$ 12.14
Weighted- average remaining contractual term	7 years 8 months 23 days	8 years 1 month 2 days
Weighted- average remaining contractual term, Exercisable	6 years 8 months 26 days
Aggregate intrinsic value	$ 188	$ 3,329
Aggregate intrinsic value, Exercisable	$ 183

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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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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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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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