Cover - shares	3 Months Ended
	Mar. 31, 2020	Aug. 04, 2020
Cover [Abstract]
Document Type	10-Q/A
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	000-28440
Entity Registrant Name	ENDOLOGIX INC /DE/
Entity Central Index Key	0001013606
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	68-0328265
Entity Address, Address Line One	2 Musick
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92618
City Area Code	949
Local Phone Number	595-7200
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock
No Trading Symbol Flag	false
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		20,657,178