Commitments and Contingencies (Details) - Sharecare [Member] $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) Installment
Contractual Commitment [Abstract]
Period over which payments are to be made to joint venture	5 years
Remaining payment obligation responsibility percentage	66.70%
Contractual obligations in respect of purchase price to be paid in connection with Sharecare's acquisition of additional membership interest in Gallup Joint Venture	$ 4.2
Number of quarterly installments | Installment	5
Payment obligation included in accrued liabilities	$ 1.6