Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Discontinued online game revenue and income from operations	$ 1,900,000
Discontinued game revenue from adjustments of prior period deferred revenue			$ 0
Current deferred revenue recognized	$ 389,300	$ 389,300
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Contract payment term related to advertising arrangements	30 days
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Contract payment term related to advertising arrangements	60 days
Durable Virtual Items
Disaggregation Of Revenue [Line Items]
Estimated weighted average life of product	10 months			10 months