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Fair Value Measurement - Summary of Fair Value of Redeemable Convertible Preferred Stock Warrants Liability and Derivative Liability (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Redeemable Convertible Preferred Stock Warrants
Schedule Of Fair Value Of Redeemable Convertible Preferred Stock Warrants Liability And Derivative Liability [Roll Forward]
Beginning balance	$ 0	$ 840
Change in fair value	0	1,024
Reclassification to APIC upon recapitalization	0	0
Ending balance	0	1,864	$ 0	$ 1,864
Derivative liability
Schedule Of Fair Value Of Redeemable Convertible Preferred Stock Warrants Liability And Derivative Liability [Roll Forward]
Beginning balance			0	135
Change in fair value			0	67
Ending balance	$ 0	$ 202	$ 0	$ 202

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- Definition

Fair Value Of Redeemable Convertible Preferred Stock Warrants Liability And Derivative Liability

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Fair value of warrant liability.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875

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