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Share-Based Payments - Summary of Share-Based Payments Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payments	$ (1,551)	$ 74	$ (4,078)	$ 2,965
Research & Development expenses [Member] | Employee Stock Option Member
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payments	(273)	(6)	(952)	1,144
Research & Development expenses [Member] | Restricted Stock Units [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payments	(660)	(102)	(795)	(628)
Sales & Marketing expenses [Member] | Employee Stock Option Member
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payments	(60)	186	(172)	2,063
Sales & Marketing expenses [Member] | Restricted Stock Units [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payments	(27)	(4)	(75)	(12)
General & Administrative expenses [Member] | Employee Stock Option Member
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payments	(439)	25	(1,791)	609
General & Administrative expenses [Member] | Restricted Stock Units [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payments	$ (92)	$ (24)	$ (293)	$ (211)

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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+ References

No definition available.

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