Description of Business and Basis of Presentation	6 Months Ended
Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Company Information Groupon, Inc. and subsidiaries (the "Company"), which commenced operations in October 2008, operates online local commerce marketplaces throughout the world that connect merchants to consumers by offering goods and services, generally at a discount. Consumers access those marketplaces through the Company's websites, primarily localized groupon.com sites in many countries, and its mobile applications. The Company's operations are organized into two segments: North America and International. See Note 13, Segment Information. Prior period amounts in the condensed consolidated financial statements have been adjusted to reflect discontinued operations presentation. See Note 2, Discontinued Operations, for additional information. Unaudited Interim Financial Information The Company has prepared the accompanying condensed consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC") for interim financial reporting. These condensed consolidated financial statements are unaudited and, in the Company's opinion, include all adjustments, consisting of normal recurring adjustments and accruals, necessary for a fair presentation of the Company's condensed consolidated balance sheets, statements of operations, comprehensive income (loss), cash flows and stockholders' equity for the periods presented. Operating results for the periods presented are not necessarily indicative of the results to be expected for the full year ending December 31, 2017. Certain information and disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") have been omitted in accordance with the rules and regulations of the SEC. These condensed consolidated financial statements and notes should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K, as amended, for the year ended December 31, 2016, and the Current Report on Form 8-K, dated May 17, 2017. Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The Company's condensed consolidated financial statements were prepared in accordance with U.S. GAAP and include the assets, liabilities, revenue and expenses of all wholly-owned subsidiaries and majority-owned subsidiaries over which the Company exercises control and variable interest entities for which the Company has determined that it is the primary beneficiary. Outside stockholders' interests in subsidiaries are shown on the condensed consolidated financial statements as "Noncontrolling interests." Equity investments in entities in which the Company does not have a controlling financial interest are accounted for under the equity method, the cost method, the fair value option or as available-for-sale securities, as appropriate. Adoption of New Accounting Standards The Company adopted the guidance in ASU 2015-11, Inventory (Topic 330) - Simplifying the Measurement of Inventory, on January 1, 2017. This ASU requires inventory to be measured at the lower of cost or net realizable value, rather than the lower of cost or market. The adoption of ASU 2015-11 did not have a material impact on the accompanying condensed consolidated financial statements. The Company adopted the guidance in ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (Topic 740), on January 1, 2017. This ASU requires immediate recognition of the income tax consequences of intercompany asset transfers other than inventory. The Company recorded a $3.2 million cumulative effect adjustment to increase its accumulated deficit as of January 1, 2017 to recognize the impact of that change in accounting policy. Reclassifications Certain reclassifications have been made to the condensed consolidated financial statements of prior periods and the accompanying notes to conform to the current period presentation. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, revenue and expenses, and the related disclosures of contingent liabilities in the condensed consolidated financial statements and accompanying notes. Estimates are used for, but not limited to, stock-based compensation, income taxes, valuation of acquired goodwill and intangible assets, investments, customer refunds, contingent liabilities and the useful lives of property, equipment and software and intangible assets. Actual results could differ materially from those estimates.

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Company Information

Groupon, Inc. and subsidiaries (the "Company"), which commenced operations in October 2008, operates online local commerce marketplaces throughout the world that connect merchants to consumers by offering goods and services, generally at a discount. Consumers access those marketplaces through the Company's websites, primarily localized groupon.com sites in many countries, and its mobile applications.

The Company's operations are organized into two segments: North America and International. See Note 13, Segment Information.

Prior period amounts in the condensed consolidated financial statements have been adjusted to reflect discontinued operations presentation. See Note 2, Discontinued Operations, for additional information.

Unaudited Interim Financial Information

The Company has prepared the accompanying condensed consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC") for interim financial reporting. These condensed consolidated financial statements are unaudited and, in the Company's opinion, include all adjustments, consisting of normal recurring adjustments and accruals, necessary for a fair presentation of the Company's condensed consolidated balance sheets, statements of operations, comprehensive income (loss), cash flows and stockholders' equity for the periods presented. Operating results for the periods presented are not necessarily indicative of the results to be expected for the full year ending December 31, 2017. Certain information and disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") have been omitted in accordance with the rules and regulations of the SEC. These condensed consolidated financial statements and notes should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K, as amended, for the year ended December 31, 2016, and the Current Report on Form 8-K, dated May 17, 2017.

Principles of Consolidation

The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The Company's condensed consolidated financial statements were prepared in accordance with U.S. GAAP and include the assets, liabilities, revenue and expenses of all wholly-owned subsidiaries and majority-owned subsidiaries over which the Company exercises control and variable interest entities for which the Company has determined that it is the primary beneficiary. Outside stockholders' interests in subsidiaries are shown on the condensed consolidated financial statements as "Noncontrolling interests." Equity investments in entities in which the Company does not have a controlling financial interest are accounted for under the equity method, the cost method, the fair value option or as available-for-sale securities, as appropriate.

Adoption of New Accounting Standards

The Company adopted the guidance in ASU 2015-11, Inventory (Topic 330) - Simplifying the Measurement of Inventory, on January 1, 2017. This ASU requires inventory to be measured at the lower of cost or net realizable value, rather than the lower of cost or market. The adoption of ASU 2015-11 did not have a material impact on the accompanying condensed consolidated financial statements.

The Company adopted the guidance in ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (Topic 740), on January 1, 2017. This ASU requires immediate recognition of the income tax consequences of intercompany asset transfers other than inventory. The Company recorded a $3.2 million cumulative effect adjustment to increase its accumulated deficit as of January 1, 2017 to recognize the impact of that change in accounting policy.

Reclassifications

Certain reclassifications have been made to the condensed consolidated financial statements of prior periods and the accompanying notes to conform to the current period presentation.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, revenue and expenses, and the related disclosures of contingent liabilities in the condensed consolidated financial statements and accompanying notes. Estimates are used for, but not limited to, stock-based compensation, income taxes, valuation of acquired goodwill and intangible assets, investments, customer refunds, contingent liabilities and the useful lives of property, equipment and software and intangible assets. Actual results could differ materially from those estimates.