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Fair Value Measurements - Transfers (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair Value Measurements
Amount of transfers of assets and liabilities measured on a recurring basis between Levels 1, 2 and 3 of the fair value hierarchy	$ 0	$ 0

X

- Definition

Amount of transfers of assets and liabilities measured on a recurring basis between Levels 1, 2 and 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	gkos_FairValueAssetsAndLiabilitiesLevel1Level2AndLevel3TransfersAmount
Namespace Prefix:	gkos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration