Acquisitions - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
	Oct. 19, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Transaction costs incurred		$ 3,349,951	$ 1,500,429
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