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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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