Organization and Basis of Presentation	9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of XO Group Inc. (“XO Group” or the “Company”) and its wholly-owned subsidiaries. The Condensed Consolidated Financial Statements included in this report have been prepared by the Company pursuant to the rules and regulations of the Securities Exchange Commission (“SEC”). Certain information and disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) have been condensed or omitted pursuant to such SEC rules and regulations. The Company believes that the disclosures are adequate to make the information presented not misleading. The financial statements contained herein should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2017. In the opinion of the Company's management, the accompanying unaudited Condensed Consolidated Financial Statements contain all normal and recurring adjustments necessary to present fairly the consolidated financial condition, results of operations and changes in cash flows of the Company for the interim periods presented. The results of operations for the three and nine months ended September 30, 2018 are not necessarily indicative of results to be expected for the entire calendar year. Certain prior-period financial statement amounts have been reclassified to conform to the current-period presentation. Recently Issued Accounting Pronouncements In May 2014, the FASB and the International Accounting Standards Board jointly issued a new revenue recognition standard that is designed to improve financial reporting by creating common revenue recognition guidance for U.S. GAAP and International Financial Reporting Standards. The new guidance issued under Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (“Topic 606”, “ASU 2014-09”) provides a more robust framework for addressing revenue issues, improves the comparability of revenue recognition practices across industries, provides more useful information to users of financial statements through improved disclosure requirements and simplifies the presentation of financial statements. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance permits the use of either of the following transition methods: (i) a full retrospective method reflecting the application of the standard in each prior reporting period with the option to elect certain practical expediencies, or (ii) a modified retrospective approach with the cumulative effect of initially adopting the standard recognized at the date of adoption, with additional footnote disclosures. The original effective date of the new standard was for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. In August 2015, the FASB issued an ASU that deferred by one year the effective date of this new revenue recognition standard. As a result, the new standard was effective for annual reporting periods beginning after December 15, 2017, although companies could have adopted the standard as early as the original effective date. Early application prior to the original effective date was not permitted. In the first quarter of 2018, the Company adopted the standard utilizing the full retrospective adoption method in order to provide for comparative results in all periods presented. See Note 3 for more information regarding the effects of the adoption of ASU 2014-09 on its Condensed Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, Leases, an accounting standards update that replaces existing lease accounting standards. The new standard requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The guidance also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. Treatment of lease payments in the statement of operations and statement of cash flows is relatively unchanged from previous guidance. The new standard is required to be applied with a modified retrospective approach to each prior reporting period presented with various optional practical expedients. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, that provides an additional transition method at the adoption date through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Both standards are effective for annual reporting periods beginning after December 15, 2018, with early adoption permitted. Based on ongoing evaluations, the Company currently expects the most significant changes will be related to the recognition of new right-of-use assets and lease liabilities on the Company's Consolidated Balance Sheets for real estate operating leases. In August 2018, FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The new ASU is designed to reduce complexity for accounting for costs of implementing a cloud computing service arrangement. This standard aligns the accounting for implementation costs of hosting arrangements, regardless of whether they convey a license to the hosted software. The standard will be effective for the first interim period within annual reporting periods beginning after December 15, 2019 and early adoption is permitted. The Company is currently evaluating the impact of the new guidance on its Condensed Consolidated Financial Statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation – Stock Compensation: Scope of Modification Accounting (“ASU 2017-09”). ASU 2017-09 provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718, Compensation – Stock Compensation. Specifically, an entity would not apply modification accounting if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. ASU 2017-09 is effective for annual and interim periods beginning after December 15, 2017, and early adoption was permitted. The adoption of ASU 2017-09 did not have a material impact on the Company's Condensed Consolidated Financial Statements.

Organization and Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of XO Group Inc. (“XO Group” or the “Company”) and its wholly-owned subsidiaries. The Condensed Consolidated Financial Statements included in this report have been prepared by the Company pursuant to the rules and regulations of the Securities Exchange Commission (“SEC”). Certain information and disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) have been condensed or omitted pursuant to such SEC rules and regulations. The Company believes that the disclosures are adequate to make the information presented not misleading. The financial statements contained herein should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2017.

In the opinion of the Company's management, the accompanying unaudited Condensed Consolidated Financial Statements contain all normal and recurring adjustments necessary to present fairly the consolidated financial condition, results of operations and changes in cash flows of the Company for the interim periods presented. The results of operations for the three and nine months ended September 30, 2018 are not necessarily indicative of results to be expected for the entire calendar year. Certain prior-period financial statement amounts have been reclassified to conform to the current-period presentation.

Recently Issued Accounting Pronouncements

In May 2014, the FASB and the International Accounting Standards Board jointly issued a new revenue recognition standard that is designed to improve financial reporting by creating common revenue recognition guidance for U.S. GAAP and International Financial Reporting Standards. The new guidance issued under Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (“Topic 606”, “ASU 2014-09”) provides a more robust framework for addressing revenue issues, improves the comparability of revenue recognition practices across industries, provides more useful information to users of financial statements through improved disclosure requirements and simplifies the presentation of financial statements. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance permits the use of either of the following transition methods: (i) a full retrospective method reflecting the application of the standard in each prior reporting period with the option to elect certain practical expediencies, or (ii) a modified retrospective approach with the cumulative effect of initially adopting the standard recognized at the date of adoption, with additional footnote disclosures. The original effective date of the new standard was for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. In August 2015, the FASB issued an ASU that deferred by one year the effective date of this new revenue recognition standard. As a result, the new standard was effective for annual reporting periods beginning after December 15, 2017, although companies could have adopted the standard as early as the original effective date. Early application prior to the original effective date was not permitted. In the first quarter of 2018, the Company adopted the standard utilizing the full retrospective adoption method in order to provide for comparative results in all periods presented. See Note 3 for more information regarding the effects of the adoption of ASU 2014-09 on its Condensed Consolidated Financial Statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases, an accounting standards update that replaces existing lease accounting standards. The new standard requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The guidance also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. Treatment of lease payments in the statement of operations and statement of cash flows is relatively unchanged from previous guidance. The new standard is required to be applied with a modified retrospective approach to each prior reporting period presented with various optional practical expedients. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, that provides an additional transition method at the adoption date through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Both standards are effective for annual reporting periods beginning after December 15, 2018, with early adoption permitted. Based on ongoing evaluations, the Company currently expects the most significant changes will be related to the recognition of new right-of-use assets and lease liabilities on the Company's Consolidated Balance Sheets for real estate operating leases.

In August 2018, FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The new ASU is designed to reduce complexity for accounting for costs of implementing a cloud computing service arrangement. This standard aligns the accounting for implementation costs of hosting arrangements, regardless of whether they convey a license to the hosted software. The standard will be effective for the first interim period within annual reporting periods beginning after December 15, 2019 and early adoption is permitted. The Company is currently evaluating the impact of the new guidance on its Condensed Consolidated Financial Statements.

In May 2017, the FASB issued ASU No. 2017-09, Compensation – Stock Compensation: Scope of Modification Accounting (“ASU 2017-09”). ASU 2017-09 provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718, Compensation – Stock Compensation. Specifically, an entity would not apply modification accounting if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. ASU 2017-09 is effective for annual and interim periods beginning after December 15, 2017, and early adoption was permitted. The adoption of ASU 2017-09 did not have a material impact on the Company's Condensed Consolidated Financial Statements.