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Revenue - Composition of Revenue (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net revenue	$ 206,143,861	$ 261,554,114
Commercial Advertising [Member]
Disaggregation of Revenue [Line Items]
Net revenue	171,830,152	224,314,435
Digital Advertising [Member]
Disaggregation of Revenue [Line Items]
Net revenue	21,605,742	19,815,489
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 12,707,967	$ 17,424,190

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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