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Deferred Subscription Solicitation and Commission Costs	3 Months Ended
Deferred Subscription Solicitation and Commission Costs	Mar. 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 condensed consolidated balance sheets as of March 31, 2017 and December 31, 2016 were $6.0 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 condensed consolidated statements of operations, for the three months ended March 31, 2017 and 2016 was $3.1 million and $3.9 million, respectively. Marketing costs expensed as incurred, which are included in marketing expenses in our condensed consolidated statements of operations as they did not meet the criteria for deferral, for the three months ended March 31, 2017 and 2016 were $576 thousand and $953 thousand, respectively.