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Revenue - Composition of Revenue (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net revenue	$ 62,902,935	$ 49,649,659	$ 170,689,680	$ 137,683,217
Audio [Member]
Disaggregation of Revenue [Line Items]
Net revenue	54,043,650	44,159,807	146,988,486	120,567,001
Digital [Member]
Disaggregation of Revenue [Line Items]
Net revenue	8,318,112	4,994,487	22,065,183	14,344,769
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 541,173	$ 495,365	$ 1,636,011	$ 2,771,447

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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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