DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	6 Months Ended
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	Jun. 30, 2020
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 its subsidiaries, which commenced operations in October 2008, is a global scaled two-sided marketplace that connect merchants to consumers by offering goods and services, generally at a discount. Customers access those marketplaces through our mobile applications and our websites, primarily localized groupon.com sites in many countries. Our operations are organized into two segments: North America and International. See Note 13, Segment Information. Reverse Stock Split On June 10, 2020, we effectuated a reverse stock split of our common stock at a ratio of 1-for-20. See Note 7, Stockholders' Equity and Compensation Arrangements, for additional information. As a result, the number of shares and income (loss) per share disclosed throughout this Quarterly Report on Form 10-Q have been retrospectively adjusted to reflect the reverse stock split. COVID-19 Pandemic The outbreak of the novel coronavirus ("COVID-19") in the first quarter 2020 and the preventive and protective actions that governments and our merchants and consumers have taken in response to the pandemic have resulted in significant disruption of our operations and have had an adverse impact on our financial condition, results of operations and cash flows. We rely on customers' purchases of vouchers for local experiences, including events and activities, beauty and wellness, travel and dining. The temporary closure of businesses, including restaurants and bars, event venues, and spas, resulted in a significant deterioration in our performance beginning in March 2020. The negative impact of COVID-19 on our business is expected to continue at least as long as customer and merchant behavior remains impacted by COVID-19, including the implementation of governmental measures to control the spread of the virus, including quarantines, travel restrictions, business shutdowns and restrictions on the movement of people in the United States and abroad. In light of the impact of COVID-19 on our business, we expect a net loss and negative operating cash flows for the year ending December 31, 2020. We plan to continue to actively manage and optimize our cash balances and liquidity, working capital and operating expenses, although there can be no assurances that we will be able to do so. We have taken several steps to reduce costs and preserve cash in the near-term, including, among others: reducing our workforce and furloughing staff; continuing to sell Goods on our platform instead of quickly exiting the category; reducing marketing expense by significantly shortening payback thresholds and delaying brand marketing investments; continuing to transition merchants to redemption payment terms, instead of fixed payment terms; implementing a hiring freeze; eliminating broad-based merit increases for employees; replacing cash compensation with equity compensation in 2020 for all members of our Board of Directors (the "Board"); and amending our Credit Agreement (as defined below) to, among other things, provide covenant relief through the first quarter of 2021. The future impact of COVID-19 on our business, results of operations, financial condition and liquidity is highly uncertain and will ultimately depend on future developments, including the magnitude and duration of the pandemic and the protective measures associated with reducing its spread. In the first quarter 2020, we determined the significant deterioration in our financial performance due to the disruption in our operations from COVID-19 and the sustained decrease in our stock price required us to evaluate our long-lived assets and goodwill for impairment, which resulted in the impairment of our long-lived assets and goodwill. See Note 2, Goodwill and Long-Lived Assets. Additionally, the economic impacts of COVID-19 resulted in an impairment or a reduction in the fair value of certain of our investments during the first quarter 2020. See Note 3, Investments. In April 2020, the Board approved multi-phase restructuring actions relating to our previously announced strategic shift and as part of the cost reduction measures we are implementing in response to the impact of COVID-19. We expect to incur total pre-tax charges of up to $105.0 million in connection with these multi-phase restructuring actions. See Note 9, Restructuring and Related Charges, for additional information about restructuring charges incurred during the second quarter 2020, which included employee severance and compensation benefits expenses, facilities-related costs and impairment charges and professional advisory fees. Unaudited Interim Financial Information We have prepared the accompanying condensed consolidated financial statements pursuant to the rules and regulations of the SEC for interim financial reporting. These condensed consolidated financial statements are unaudited and, in our opinion, include all adjustments, consisting of normal recurring adjustments and accruals, necessary for a fair presentation of the condensed consolidated balance sheets, statements of operations and comprehensive income (loss), cash flows and stockholders' equity for the periods presented. These condensed consolidated financial statements and notes should be read in conjunction with the audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2019. Principles of Consolidation The condensed consolidated financial statements include the accounts of Groupon, Inc. and its wholly-owned subsidiaries, majority-owned subsidiaries over which we exercise control and variable interest entities for which we are the primary beneficiary. All intercompany accounts and transactions have been eliminated in consolidation. Outside stockholders' interests in subsidiaries are shown on the condensed consolidated financial statements as Noncontrolling interests. Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Estimates in our financial statements include, but are not limited to, the following: variable consideration from unredeemed vouchers, income taxes, leases, initial valuation and subsequent impairment testing of goodwill, other intangible assets and long-lived assets, investments, receivables, customer refunds and other reserves, contingent liabilities, and the useful lives of property, equipment and software and intangible assets. Actual results could differ materially from those estimates. Adoption of New Accounting Standards We adopted the guidance in ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses of Financial Instruments ("CECL") on January 1, 2020. This ASU requires entities to measure credit losses for financial assets measured at amortized cost based on expected losses over the lifetime of the asset rather than incurred losses. The adoption of ASU 2016-13 did not have a material impact on the condensed consolidated financial statements. See Note 8, Revenue Recognition, for additional information. We adopted the guidance in ASU 2017-04, Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment on January 1, 2020. This ASU eliminates Step 2 of the goodwill impairment test and requires a goodwill impairment to be measured as the amount by which a reporting unit's carrying amount exceeds its fair value, not to exceed the carrying amount of its goodwill. During the first quarter 2020, we determined a triggering event occurred that required us to evaluate our goodwill for impairment, and we recorded an impairment charge as a result of that assessment. See Note 2, Goodwill and Long-Lived Assets, for additional information. We adopted the guidance in ASU 2018-13, Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement on January 1, 2020. This ASU modifies the disclosure requirements in Topic 820, Fair Value Measurements, by removing, modifying, or adding certain disclosures. The adoption of ASU 2018-13 did not have a material impact on the condensed consolidated financial statements.