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Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2019
Nov. 05, 2019
Document and Entity Information    
Entity Registrant Name GLAUKOS Corp  
Entity Central Index Key 0001192448  
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2019  
Entity File Number 001-37463  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 33-0945406  
Entity Address, Address Line One 229 Avenida Fabricante  
Entity Address, City or Town San Clemente  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92672  
City Area Code 949  
Local Phone Number 367-9600  
Title of 12(b) Security Common Stock  
Trading Symbol GKOS  
Security Exchange Name NYSE  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   36,927,816
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3