Goodwill and Acquired Intangible Assets - Additional Information (Detail) $ in Thousands	6 Months Ended
Jun. 30, 2023 USD ($) Units
Indefinite-Lived Intangible Assets [Line Items]
Impairment loss	$ 0
Number of Reporting Units \| Units	1
Changes to goodwill	$ 0
Purchase Agreement [Member] \| Eversurance, LLC [Member]
Indefinite-Lived Intangible Assets [Line Items]
Long-lived assets	$ 1,100

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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- Definition

Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

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