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Fair Value Measurements - Transfers (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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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