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Restructuring Activities and COVID -19 Update - Summary of restructuring costs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 10.3
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 6.0
Lease Terminaion [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		4.3
Sales and marketing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		5.8
Sales and marketing [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1.5
Sales and marketing [Member] | Lease Terminaion [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 4.3
Operations and support [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2.9
Operations and support [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2.9
Research and development[Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.7
Research and development[Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.7
General and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.9
General and administrative [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0.9

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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+ References

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