Document and Entity Information
9 Months Ended
Sep. 30, 2013
Oct. 25, 2013
Document and Entity Information [Abstract]    
Entity Registrant Name ENDOLOGIX INC /DE/  
Entity Central Index Key 0001013606  
Document Type 10-Q  
Document Period End Date Sep. 30, 2013  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   63,536,561
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q3