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Revenue - Composition of Revenue (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net revenue	$ 49,649,659	$ 66,114,701	$ 137,683,217	$ 189,461,003
Commercial Advertising [Member]
Disaggregation of Revenue [Line Items]
Net revenue	42,168,479	57,312,548	114,014,198	164,470,136
Digital Advertising [Member]
Disaggregation of Revenue [Line Items]
Net revenue	4,994,487	4,908,072	14,344,768	13,162,700
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 2,486,693	$ 3,894,081	$ 9,324,251	$ 11,828,167

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