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Acquisitions - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 19, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]            
Transaction costs incurred   $ 1,036,602 $ 3,769,425 $ 4,386,553 $ 5,269,854  
Lovoo, Inc.            
Business Acquisition [Line Items]            
Total consideration $ 86,148,750          
Contingent consideration 5,000,000          
Fair value of contingent consideration at the closing date $ 5,000,000          
Transaction costs incurred           $ 1,400,000