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Deferred Subscription Solicitation and Commission Costs	12 Months Ended
Deferred Subscription Solicitation and Commission Costs	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Subscription Solicitation and Commission Costs	Deferred Subscription Solicitation and Commission Costs Total deferred subscription solicitation and commission costs included in the accompanying consolidated balance sheets as of December 31, 2017 and 2016 was $1.7 million and $5.1 million, respectively. Amortization of deferred subscription solicitation and commission costs, which is included in either marketing or commission expense in our consolidated statements of operations, for the years ended December 31, 2017 and 2016 were $10.3 million and $12.6 million, respectively. Marketing costs for the years ended December 31, 2017 and 2016, which are included in marketing expenses in our consolidated statements of operations as they did not meet the criteria for deferral, were $1.8 million and $1.5 million, respectively. Upon adoption of ASU 2014-09, "Revenue from Contracts with Customers," on January 1, 2018, we will no longer defer and amortize direct-response advertising costs.