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Commitments and Contingencies - Other (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) item	Dec. 31, 2022 USD ($) item
Commitments and Contingencies
Restricted cash pledged for letter of credit	$ 5.6	$ 6.8
Number of Months from start of lease for adjustments to Letter of Credit | item	37
Adjustment rate of Letter of Credit (as a percent)	20.00%
Amount of Letter of Credit outstanding after adjustments	$ 2.0
Number of other irrevocable letters of credit outstanding | item	1	1
Restricted cash pledged for office lease agreement	$ 0.2	$ 0.2
Deferred compensation plan liability	10.3	8.2
Deferred Compensation Plan Assets	$ 10.4	$ 8.4

X

- Definition

Represents the adjustment percentage to the letters of credit balance outstanding.

+ References

No definition available.

+ Details

Name:	gkos_AdjustmentPercentageOfLettersOfCreditBalanceOutstanding
Namespace Prefix:	gkos_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the minimal amount of letters of credit balance outstanding after all adjustments.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of months from the start of the lease for adjustments to the letters of credit balance outstanding to begin.

+ References

No definition available.

+ Details

Name:	gkos_NumberOfMonthsOfLeaseTermForAdjustmentsOfLettersOfCreditBalanceOutstandingToBegin
Namespace Prefix:	gkos_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of other irrevocable letters of credit outstanding.

+ References

No definition available.

+ Details

Name:	gkos_NumberOfOtherIrrevocableLettersOfCreditOutstanding
Namespace Prefix:	gkos_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the amount of restricted cash pledged for letter of credit.

+ References

No definition available.

+ Details

Name:	gkos_RestrictedCashPledgedForLetterOfCredit
Namespace Prefix:	gkos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of restricted cash pledged for office lease agreement.

+ References

No definition available.

+ Details

Name:	gkos_RestrictedCashPledgedForOfficeLeaseAgreement
Namespace Prefix:	gkos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DeferredCompensationPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant