Convertible Preferred Stock, Tranche Liability and Warrant Liability - Additional Information (Detail)			3 Months Ended	9 Months Ended
	Jul. 06, 2021 shares	Jun. 17, 2021 USD ($) $ / shares shares	Sep. 30, 2021 $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Jun. 22, 2021 $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Nov. 20, 2020 $ / shares shares	Oct. 19, 2018 $ / shares shares
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Shares Issued						19,877,219
Proceeds from convertible preferred stock | $				$ 30,031,000
Temporary Equity, Shares Outstanding						19,877,219
Series A -1 Convertible Preferred Stock Warrant Liability [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Class of warrants or rights number of shares covered by warrants or rights								447,426
Class of warrants or rights term								10 years
Class of warrants or right exercise price per share | $ / shares								$ 2.794
Class of warrants or rights expiry date								Oct. 18, 2028
Fair value of warrant liability per share | $ / shares					$ 12.02	$ 0.85
Underlying Equity Value [Member] | Series B Convertible Preferred Stock Tranche Rights Liability [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Financial liabilities at fair value | $		$ 81,190,000				$ 5,033,000
Series B Redeemable Convertible Preferred Stock [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Conversion of convertible preferred stock into common stock upon initial public offering, Shares	19,770,070
Temporary Equity, Shares Outstanding		19,770,070
Series A-1 Redeemable Convertible Preferred Stock [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Shares Issued						7,537,879
Class of warrants or rights number of shares covered by warrants or rights					447,426
Class of warrants or right exercise price per share | $ / shares					$ 2.794
Conversion of convertible preferred stock into common stock upon initial public offering, Shares	7,985,305
Temporary Equity, Shares Outstanding					7,985,305	7,537,879
Series A Convertible Preferred Stock [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Shares Issued			0	0		477,297
Temporary equity par or stated value per share | $ / shares			$ 0.0001	$ 0.0001		$ 0.0001
Conversion of convertible preferred stock into common stock upon initial public offering, Shares	477,297		(477,297)	(477,297)
Temporary Equity, Shares Outstanding			0	0		477,297
Convertible Preferred Stock [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Temporary Equity, Shares Outstanding			0	0
Prospective Conversion of Temporary Equity into Permanent Equity [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Number of times the redeemable convertible preferred stock equal to the share issue price			2	2
Sale of stock issue price per share | $ / shares			$ 7.60	$ 7.60
Percentage of votes in terms of shareholding needed for conversion into permanent equity			67.00%	67.00%
Prospective Conversion of Temporary Equity into Permanent Equity [Member] | Minimum [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Proceeds from initial public offer | $				$ 75,000,000
Private Placement [Member] | Series B Redeemable Convertible Preferred Stock [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Shares Issued							19,770,070
Temporary equity par or stated value per share | $ / shares							$ 0.0001
Temporary equity issue price per share | $ / shares							$ 3.80
Private Placement [Member] | Series B Redeemable Convertible Preferred Stock [Member] | Closing of Milestone [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Temporary equity issue price per share | $ / shares		$ 3.80
Temporary equity shares issued during the period shares		7,908,027
Proceeds from convertible preferred stock | $		$ 30,000,000.0
Private Placement [Member] | Series B Redeemable Convertible Preferred Stock [Member] | Initial Closing [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Shares Issued							11,862,043
Private Placement [Member] | Series B Redeemable Convertible Preferred Stock [Member] | Achievement of Milestone [Member]
Convertible Preferred Stock Tranche Liability And Warrant Liability [Line Items]
Temporary equity milestone shares							7,908,027