Redeemable Convertible Preferred Shares - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended	6 Months Ended
	Jun. 01, 2021	Feb. 28, 2021	Nov. 30, 2020	Dec. 31, 2019	Mar. 31, 2020	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Temporary Equity [Line Items]
Payment of stock issuance costs	$ 17,000
IPO [Member]
Temporary Equity [Line Items]
Issuance of incentive shares	11,500,000					11,500,000
Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Common stock shares issued as a result of conversion of temporary equity into permanent equity						32,489,398
Temporary Equity, Shares Outstanding							0
Series A Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary equity stock issued during the period shares new issues				10,348,507
Temporary equity issue price per share				$ 2.899
Proceeds from redeemable convertible preferred stock				$ 30,000
Payment of accrued interest				2,100
Payment of stock issuance costs				$ 95,000
Temporary equity shares issued upon conversion of notes payable				2,154,245
Derivative liability at fair value									$ 1,500
Series A Redeemable Convertible Preferred Stock [Member] | Milestone Achieved [Member]
Temporary Equity [Line Items]
Temporary equity stock issued during the period shares new issues			10,348,505
Proceeds from redeemable convertible preferred stock			$ 30,000
Payment of stock issuance costs			$ 22,000
Derivative liability at fair value								$ 0
Series A Redeemable Convertible Preferred Stock [Member] | Temporary Equity Related Tranche Liability [Member]
Temporary Equity [Line Items]
Unrealized gain loss due to change in fair value of derivatives					$ 200
Series A Redeemable Convertible Preferred Stock [Member] | Milestone Achievement [Member]
Temporary Equity [Line Items]
Temporary equity issue price per share									$ 2.899
Temporary equity shares subscribed but not issued									10,348,505
Series B Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary equity stock issued during the period shares new issues		9,638,141
Temporary equity issue price per share		$ 13.488
Payment of stock issuance costs		$ 243,000
Series B Redeemable Convertible Preferred Stock [Member] | Gross Proceeds [Member]
Temporary Equity [Line Items]
Proceeds from redeemable convertible preferred stock		$ 130,000