Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) AdvertisingCustomer Advertiser Market Agreement shares	Dec. 31, 2020 USD ($) Advertiser shares	Dec. 31, 2019 USD ($) shares
Accounting Policies [Line Items]
Cash and cash equivalents	$ 185,094	$ 119,162	$ 33,123
Restricted cash	$ 749	749	734
Available for sale debt securities		27,988
Number of advertisers represent more than five percent of trade receivables | Advertiser	0
Number of advertising customer represented more than five percent of revenue | AdvertisingCustomer	0
Estimated losses for bad debts	$ 3,500	2,500	2,300
Bad debts actually charged off	900	1,500	2,800
Long term debt fair value	$ 209,100	210,500
Percentage of tax benefit recognized	50.00%
Advertising expense	$ 100	100	500
Net revenue	760,192	344,026	273,575
Broadcast trade cost	$ 400	$ 200	$ 500
Stock options granted | shares	0	0	0
Shares of dilutive securities not included in computation of diluted earnings per share | shares	465,993	892,720	1,117,216
Other comprehensive income (loss), net of tax	$ 79	$ (925)	$ 1,281
Trade Receivables | Customer Concentration Risk | Largest Advertisers
Accounting Policies [Line Items]
Number of largest advertisers | Advertiser	5	5
Concentration risk percentage	3.00%	10.00%
Revenue | Customer Concentration Risk | Commercial Partner
Accounting Policies [Line Items]
Concentration risk percentage	55.00%	24.00%
Revenue | Customer Concentration Risk | Largest Advertisers
Accounting Policies [Line Items]
Concentration risk percentage	13.00%	3.00%
Broadcast Equipment
Accounting Policies [Line Items]
Net revenue	$ 400	$ 200	$ 500
TelevisaUnivision
Accounting Policies [Line Items]
Number of marketing and sales agreements | Agreement	2
Number of markets involved in sales and marketing | Market	6
Accounting Standards Update 2019-12
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2021
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Outside the United States
Accounting Policies [Line Items]
Cash and cash equivalents	$ 53,700	$ 34,500