Preferred Stock and Stockholders Deficit - Summary of Option Activity Under the Company's Plans (Detail) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Equity [Abstract]
Number of Option Outstanding,Beginning balance | shares	8,738,880
Number of Option Outstanding,Granted | shares	3,790,001
Number of Option Outstanding,Exercised | shares	(89,807)
Number of Option Outstanding,Cancelled | shares	(403,310)
Number of Option Outstanding,Ending balance | shares	12,035,764	8,738,880
Number of Option Exercisable | shares	6,600,679
Weighted Average Exercise Price,Beginning balance | $ / shares	$ 2.73
Weighted Average Exercise Price,Granted | $ / shares	0.52
Weighted average exercise price,Exercised | $ / shares	0.52
Weighted average exercise price,Cancelled | $ / shares	2.28
Weighted Average Exercise Price,Ending balance | $ / shares	2.07	$ 2.73
Weighted Average Exercise Price,Exercisable | $ / shares	$ 2.32
Weighted- Average Remaining Contractual Term,Beginning balance	7 years 6 months	7 years 4 months 24 days
Weighted- Average Remaining Contractual Term,Granted	9 years 4 months 24 days
Weighted- Average Remaining Contractual Term,Cancelled	7 years 1 month 6 days
Weighted- Average Remaining Contractual Term, Ending balance	7 years 6 months	7 years 4 months 24 days
Weighted- Average Remaining Contractual Term,Exercisable	6 years 3 months 18 days
Aggregate Intrinsic Value,Beginning balance | $	$ 0
Aggregate Intrinsic Value,Ending balance | $	437	$ 0
Aggregate Intrinsic Value,Exercisable | $	$ 103