The Company and Significant Accounting Policies - Concentrations of Credit Risk and Trade Receivables - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2024 USD ($) Advertiser	Mar. 31, 2023 USD ($)	Dec. 31, 2023 Advertiser
Accounting Policies [Line Items]
Number of advertisers represent more than five percent of trade receivables	0
Number of advertising customer represented more than five percent of revenue	0
Estimated losses for bad debts \| $	$ 1.3	$ 0.9
Bad debts actually charged off \| $	$ 0.2	$ 0.2
Customer Concentration Risk \| Trade Receivables \| Largest Advertisers
Accounting Policies [Line Items]
Number of largest advertisers	5		5
Concentration risk percentage	9.00%		7.00%
Customer Concentration Risk \| Revenue \| Largest Advertisers
Accounting Policies [Line Items]
Concentration risk percentage	12.00%	12.00%

Accounting policies.

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

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

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Number of largest advertisers.

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- Definition

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

+ References

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-Topic 326
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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