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Loss in Equity Interests	9 Months Ended
Loss in Equity Interests	Sep. 30, 2018
Loss in Equity Interests [Abstract]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	Loss in Equity Interests During the nine months ended September 30, 2017, the Company determined that impairment indicators existed in its investment in Jetaport, Inc., a hotel room block marketplace technology company. As of June 30, 2017, Jetaport, Inc. had not yet raised additional capital, and based upon Jetaport, Inc.'s financial condition, XO Group recorded an other-than-temporary impairment of $1.0 million to reduce its carrying value of Jetaport, Inc. to zero during the second quarter of 2017. The impairment is included in “Loss in equity interests” within the Condensed Consolidated Statements of Operations. There were no impairment losses recorded for the three and nine months ended September 30, 2018.