The Company and Significant Accounting Policies - Concentrations of Credit Risk and Trade Receivables - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2026 USD ($) Advertiser AdvertisingCustomer	Mar. 31, 2025 USD ($) AdvertisingCustomer	Dec. 31, 2025 Advertiser
Accounting Policies [Line Items]
Number of advertisers represent more than five percent of trade receivables \| Advertiser	0		0
Number of advertising customer represented more than five percent of revenue \| AdvertisingCustomer	0	0
Estimated losses for bad debts	$ (0.2)	$ 0.2
Bad debts actually charged off	$ 0.1	$ 0.1
Customer Concentration Risk \| Trade Receivables \| Largest Advertiser One
Accounting Policies [Line Items]
Concentration risk percentage	24.00%
Customer Concentration Risk \| Trade Receivables \| Largest Advertiser Two
Accounting Policies [Line Items]
Concentration risk percentage	6.00%

Accounting policies.

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

+ References

No definition available.

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

+ References

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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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- 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
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Paragraph 18
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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- Definition

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
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-Publisher FASB
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