Description of Business, Basis of Presentation, and Operating Segment	12 Months Ended
Dec. 31, 2014
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 and production facilities located in Irvine, 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 treatment of abdominal aortic aneurysms ("AAA"). The Company's AAA products are built on one of two platforms: (1) traditional minimally-invasive endovascular repair ("EVAR") or (2) endovascular sealing (“EVAS”), the Company's innovative solution for sealing the aneurysm sac while maintaining blood flow through two blood flow lumens. The Company's current EVAR products include the Endologix AFX Endovascular AAA System (“AFX”), the VELA Proximal Endograft (“VELA”) and the Endologix Intuitrak Endovascular AAA System (“Intuitrak”). The Company's current EVAS product is the Nellix Endovascular Aneurysm Sealing System (“Nellix EVAS System”). Sales of the Company's EVAR and EVAS platforms (including extensions and accessories) to hospitals in the U.S. and Europe, and to third-party international distributors, provide the sole source of the Company's reported revenue. The Company's EVAR products consist of (i) a cobalt chromium alloy stent covered by polytetrafluoroethylene (commonly referred to as "ePTFE") graft material (“Stent Graft”) and (ii) an accompanying delivery system. Once fixed in its proper position within the abdominal aorta, the Company's EVAR device provides a conduit for blood flow, thereby relieving pressure within the weakened or “aneurysmal” section of the vessel wall, which greatly reduces the potential for the AAA to rupture. The Company's EVAS product consists of (i) bilateral covered stents with endobags, (ii) a biocompatible polymer injected into the endobags to seal the aneurysm and (iii) a delivery system and polymer dispenser. The Company's EVAS product seals the entire aneurysm sac effectively excluding the aneurysm sac reducing the likelihood of future aneurysm rupture. Additionally, it has the potential to reduce post procedural re-interventions. (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 of America ("GAAP") and with the rules and regulations of the U.S. 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 years ended December 31, 2014, 2013, and 2012 there were no related party transactions. On May 28, 2014, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU ") No. 2014-09, "Revenue from Contracts with Customers", which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for the Company on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting. (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, 2014, 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 U.S.

Description of Business, Basis of Presentation, and Operating Segment

(a)Description of Business

Endologix, Inc. (the "Company") is a Delaware corporation with corporate headquarters and production facilities located in Irvine, 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 treatment of abdominal aortic aneurysms ("AAA"). The Company's AAA products are built on one of two platforms: (1) traditional minimally-invasive endovascular repair ("EVAR") or (2) endovascular sealing (“EVAS”), the Company's innovative solution for sealing the aneurysm sac while maintaining blood flow through two blood flow lumens. The Company's current EVAR products include the Endologix AFX Endovascular AAA System (“AFX”), the VELA Proximal Endograft (“VELA”) and the Endologix Intuitrak Endovascular AAA System (“Intuitrak”). The Company's current EVAS product is the Nellix Endovascular Aneurysm Sealing System (“Nellix EVAS System”). Sales of the Company's EVAR and EVAS platforms (including extensions and accessories) to hospitals in the U.S. and Europe, and to third-party international distributors, provide the sole source of the Company's reported revenue.

The Company's EVAR products consist of (i) a cobalt chromium alloy stent covered by polytetrafluoroethylene (commonly referred to as "ePTFE") graft material (“Stent Graft”) and (ii) an accompanying delivery system. Once fixed in its proper position within the abdominal aorta, the Company's EVAR device provides a conduit for blood flow, thereby relieving pressure within the weakened or “aneurysmal” section of the vessel wall, which greatly reduces the potential for the AAA to rupture.

The Company's EVAS product consists of (i) bilateral covered stents with endobags, (ii) a biocompatible polymer injected into the endobags to seal the aneurysm and (iii) a delivery system and polymer dispenser. The Company's EVAS product seals the entire aneurysm sac effectively excluding the aneurysm sac reducing the likelihood of future aneurysm rupture. Additionally, it has the potential to reduce post procedural re-interventions.

(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 of America ("GAAP") and with the rules and regulations of the U.S. 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 years ended December 31, 2014, 2013, and 2012 there were no related party transactions.

On May 28, 2014, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU ") No. 2014-09, "Revenue from Contracts with Customers", which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for the Company on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting.

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, 2014, 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 U.S.