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Schedules of Concentration of Risk Based on Revenue (Detail) - Customer Concentration Risk - Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Advertiser A
Concentration Risk [Line Items]
Concentration risk, percentage	25.00%	29.00%	26.00%	27.00%
Advertiser B
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%		16.00%	12.00%

X

- Definition

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.

+ References

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- Definition

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.

+ References

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