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Organization and Business - Customer Concentration (Details) - Customer Concentration Risk - Net Revenue | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Yahoo! and Google |  |
Concentration Risk [Line Items] |  |
Percentage of concentration risk (as percent) | 85.30% | 80.00%
Yahoo! |  |
Concentration Risk [Line Items] |  |
Percentage of concentration risk (as percent) | 73.60% | 70.50%
Google |  |
Concentration Risk [Line Items] |  |
Percentage of concentration risk (as percent) | 11.70% | 9.50%

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