For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Contract payment term related to advertising arrangements.

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Disposal group, including discontinued operation revenue and income from operations.

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Estimated weighted average life of product.

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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Discontinued online game revenue and income from operations		$ 900,000	$ 1,300,000
Changes in revenue from adjustments of prior period deferred revenue		$ 0
Discontinued game revenue from adjustments of prior period deferred revenue	$ 0		$ 0
Current deferred revenue recognized	$ 191,300,000
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 [Member]
Disaggregation Of Revenue [Line Items]
Estimated weighted average life of product	9 months	9 months	8 months
Sales Revenue, Net [Member] \| Product Concentration Risk [Member] \| Consumable Virtual Items [Member]
Disaggregation Of Revenue [Line Items]
Percentage of online game revenue	26.00%	43.00%	44.00%
Sales Revenue, Net [Member] \| Product Concentration Risk [Member] \| Durable Virtual Items [Member]
Disaggregation Of Revenue [Line Items]
Percentage of online game revenue	74.00%	57.00%	56.00%