Acquisitions - Consideration Transferred (Details) - Lovoo, Inc.	Oct. 19, 2017 USD ($)
Business Acquisition [Line Items]
Cash consideration	$ 65,000,000
Contingent consideration	5,000,000
Net working capital adjustment	16,148,750
Total estimated consideration	86,148,750
Period one
Business Acquisition [Line Items]
Cash held in escrow	$ 6,500,000
Cash held in escrow, period from acquisition date to be paid	24 months
Period two
Business Acquisition [Line Items]
Cash held in escrow	$ 4,000,000
Cash held in escrow, period from acquisition date to be paid	36 months