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Other Financial Statement Information - Summary of Depreciation and Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disclosure Details Of Depreciation And Amortization [Line Items]
Depreciation and amortization expenses	$ 3,775	$ 4,415	$ 11,604	$ 14,162
Cost of revenue
Disclosure Details Of Depreciation And Amortization [Line Items]
Depreciation and amortization expenses	1,403	1,904	4,479	5,796
Sales and marketing
Disclosure Details Of Depreciation And Amortization [Line Items]
Depreciation and amortization expenses	1,401	1,377	4,199	4,988
Technology and development
Disclosure Details Of Depreciation And Amortization [Line Items]
Depreciation and amortization expenses	538	656	1,709	1,973
General and administrative
Disclosure Details Of Depreciation And Amortization [Line Items]
Depreciation and amortization expenses	$ 433	$ 478	$ 1,217	$ 1,405

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- Definition

Disclosure details of depreciation and amortization.

+ References

No definition available.

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: 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=121586364&loc=d3e3602-108585

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