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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 USD ($) Advertiser AdvertisingCustomer | Jun. 30, 2025 USD ($) AdvertisingCustomer | Jun. 30, 2026 USD ($) Advertiser AdvertisingCustomer | Jun. 30, 2025 USD ($) AdvertisingCustomer | Dec. 31, 2025 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 | AdvertisingCustomer | 0 | 0 | 0 | 0 |
Estimated losses for bad debts | $ (0.6) | $ 0.7 | $ 0.8 | $ 0.5 |
Bad debts actually charged off | $ 0.1 | $ 0.4 | $ 0.2 | $ 0.5 |
Customer Concentration Risk | Trade Receivables | Largest Advertiser One |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 21.00% |  |
Customer Concentration Risk | Trade Receivables | Largest Advertiser Two |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 6.00% |  |
Customer Concentration Risk | Trade Receivables | Largest Advertiser Three |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 5.00% |  |
Customer Concentration Risk | Revenue | Largest Advertiser One |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage | 40.00% |  | 38.00% |  |
Customer Concentration Risk | Revenue | Largest Advertiser Two |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage | 5.00% |  | 5.00% |  |

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