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Revenue - Composition of Revenue (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net revenue	$ 48,212,040	$ 57,650,426
Audio [Member]
Disaggregation of Revenue [Line Items]
Net revenue	41,729,602	50,912,978
Digital [Member]
Disaggregation of Revenue [Line Items]
Net revenue	5,763,728	5,284,025
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 718,710	$ 1,453,423

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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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