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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($) Customers	Jun. 30, 2025 USD ($) Customers	Jun. 30, 2026 USD ($) Customers	Jun. 30, 2025 USD ($) Customers	Dec. 31, 2025 USD ($) Customers
Significant Accounting Policies [Line Items]
Deferred revenue					$ 1,700,000
Contract with customer, liability, revenue recognized			$ 1,400,000
Advertising expenses	$ 138,189,000	$ 111,109,000	273,143,000	$ 230,881,000
Allowance for doubtful accounts	100,000		$ 100,000		$ 100,000
Common stock, terms of conversion			Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time.
Expected period of benefit of sales commissions, description			one year or less		one year or less
Asset transfers	0	0	$ 0	0
Liability transfers	$ 0	$ 0	$ 0	$ 0
ASU 2025-05 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2026		Jan. 01, 2026
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true		true
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Significant Accounting Policies [Line Items]
Money market funds	$ 15,500,000		$ 15,500,000		$ 15,300,000
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Number of major customers \| Customers	3	2	2	2
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer A [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	31.00%	35.00%	35.00%	39.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer B [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	12.00%	11.00%	11.00%	12.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer C [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	11.00%
Accounts Receivable [Member] \| Credit Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Number of major customers \| Customers			4		2
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Customer A [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage			27.00%		36.00%
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Customer B [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage			16.00%		11.00%
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Customer C [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage			12.00%
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Customer D [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage			11.00%