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Concentrations - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 Entity Agency Distributor	Mar. 31, 2018 Entity Agency Distributor	Dec. 31, 2018
Concentration Risk [Line Items]
Number of financial institutions | Entity	2	2
Number of distribution partners that were paid revenue | Distributor	0	0
Minimum
Concentration Risk [Line Items]
Percentage of revenue as criteria for major distribution partners	10.00%	10.00%
Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Number of advertising agencies | Agency	1	1
Concentration risk, percentage	14.00%	20.00%
Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	29.00%		23.00%

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- Definition

Number of advertising agencies.

+ References

No definition available.

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- Definition

The number of financial institutions.

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- Definition

Number of distribution partners.

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- Definition

Percentage of revenue as criteria for major distribution partners.

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- 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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