Document and Entity Information (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	May 01, 2012	Jun. 30, 2011
Document Information [Line Items]
Entity Registrant Name	ENDOLOGIX INC /DE/
Entity Central Index Key	0001013606
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		58,239,496
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 146,296,509