Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 06, 2020
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	Jun. 30, 2020
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		44,674,910
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2