v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
May 06, 2019
Document and Entity Information [Abstract]    
Entity Registrant Name ENDOLOGIX INC /DE/  
Entity Central Index Key 0001013606  
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   16,787,032
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Entity Emerging Growth Company false  
Entity Small Business false