Description of Business, Basis of Presentation and Operating Segment	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business, Basis of Presentation, and Operating Segment	Description of Business, Basis of Presentation, and Operating Segment (a)Description of Business Endologix^®, Inc. (the “Company”) is a Delaware corporation with corporate headquarters located in Irvine, California and production facilities located in Irvine, California and Santa Rosa, California. The Company develops, manufactures, markets and sells innovative medical devices for the treatment of aortic disorders. The Company’s products are intended for the minimally-invasive endovascular treatment of abdominal aortic aneurysms (“AAA”). The Company’s AAA products are built on one of two platforms: (i) traditional minimally-invasive endovascular aneurysm repair (“EVAR”); or (ii) endovascular aneurysm sealing (“EVAS”), the Company’s innovative solution for sealing the aneurysm sac while maintaining blood flow. The Company’s current EVAR products include the AFX^® Endovascular AAA System, the VELA^® Proximal Endograft and the Ovation^® Abdominal Stent Graft System. The Company’s current EVAS product is the Nellix^® Endovascular Aneurysm Sealing System (the “Nellix EVAS System”). The Company derives all of its reported revenue from sales of its EVAR and EVAS products (including extensions and accessories) to hospitals and third party distributors. (b) Basis of Presentation The accompanying consolidated financial statements in this Annual Report on Form 10-K have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and with the rules and regulations of the United States Securities and Exchange Commission (“SEC”). These financial statements include the financial position, results of operations and cash flows of the Company, including its subsidiaries, all of which are wholly-owned. All inter-company accounts and transactions have been eliminated in consolidation. For the years ended December 31, 2019, 2018 and 2017, there were no related party transactions. (c) Operating Segment The Company has one operating and reporting segment that is focused exclusively on the development, manufacture, marketing and sale of EVAR and EVAS products for the treatment of aortic disorders. For the year ended December 31, 2019, all of the Company’s revenue and related expenses were solely attributable to these activities. Substantially all of the Company’s long-lived assets are located in the United States. (d) Reverse Stock Split At a special meeting of stockholders held on February 22, 2019, the Company’s stockholders approved a proposal to amend the Amended and Restated Certificate of Incorporation, as amended, to effect a reverse stock split of the Company’s issued and outstanding common stock at a ratio not less than 1-for-5 and not greater than 1-for-10 (inclusive), with the exact ratio to be set as a whole number within that range at the discretion of the board of directors (the “Board”) before February 22, 2020 without further approval or authorization of our stockholders. On February 26, 2019, the Board approved the reverse stock split at a ratio of 1-for-10. On March 5, 2019, the Company filed a Certificate of Amendment of Amended and Restated Certificate of Incorporation, as Amended, with the Secretary of State of the State of Delaware to effect the reverse stock split. Unless stated otherwise, all share and per share amounts in this Annual Report on Form 10-K have been retroactively adjusted to reflect the reverse stock split.