Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregation of Revenue (Details)

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]    
Net revenue $ 73,330,642 $ 79,554,493
Percentage of total revenue 100.00% 100.00%
Mobile    
Disaggregation of Revenue [Line Items]    
Net revenue $ 50,785,680 $ 49,216,065
Desktop    
Disaggregation of Revenue [Line Items]    
Net revenue 21,398,065 29,392,347
Other    
Disaggregation of Revenue [Line Items]    
Net revenue 1,146,897 946,081
Partners    
Disaggregation of Revenue [Line Items]    
Net revenue $ 52,087,368 $ 59,745,179
Percentage of total revenue 71.00% 75.10%
Owned Sites    
Disaggregation of Revenue [Line Items]    
Net revenue $ 21,243,274 $ 19,809,314
Percentage of total revenue 29.00% 24.90%