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Concentrations (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue |
Schedules of Concentration of Risk, by Risk Factor | The advertisers representing more than 10% of revenue are as follows (in percentages):
|  | Three months ended March 31, |
|  | 2018 |  |  | 2019 |
Advertiser A |  |  | 18 | % |  |  | 27 | %
Advertiser B |  |  | 27 | % |  |  | 15 | %
Accounts Receivable |
Schedules of Concentration of Risk, by Risk Factor | The outstanding receivable balance for each advertiser representing more than 10% of accounts receivable is as follows (in percentages):
|  | At December 31, 2018 |  |  | At March 31, 2019 |
Advertiser A |  |  | 15 | % |  | * |
Advertiser B |  |  | 31 | % |  |  | 35 | %
* Less than 10% of accounts receivable.

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