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The Company and Significant Accounting Policies - Concentrations of Credit Risk and Trade Receivables - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) Advertiser	Sep. 30, 2023 USD ($) Advertiser	Sep. 30, 2024 USD ($) Advertiser	Sep. 30, 2023 USD ($) Advertiser	Dec. 31, 2023 Advertiser
Accounting Policies [Line Items]
Number of advertisers represent more than five percent of trade receivables | Advertiser	0		0		0
Number of advertising customer represented more than five percent of revenue | Advertiser	0	0	0	0
Estimated losses for bad debts | $	$ 0.2	$ 0.2	$ 0.8	$ 0.3
Bad debts actually charged off | $	$ 0.1		$ 0.3	$ 0.5

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- Definition

Accounting policies.

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- Definition

Number of advertisers represent more than five percent of trade receivables.

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- Definition

Number of advertising customer represented more than five percent of revenue.

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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