Debt instruments maturity date.

No definition available.

Name:	gcts_DebtInstrumentsMaturityDate
Namespace Prefix:	gcts_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Topic 835
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
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Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=gcts_KyeonghoLeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=gcts_MujinElectronicsCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

Subsequent Events - Additional Information (Details) $ in Millions, ₩ in Billions	1 Months Ended																	6 Months Ended
	Aug. 31, 2026 USD ($)	Jul. 31, 2026 USD ($)	Jul. 31, 2026 KRW (₩)	Apr. 30, 2026	Dec. 31, 2025	Nov. 30, 2025	Oct. 31, 2025	Jul. 31, 2025	Jun. 30, 2025	May 31, 2025	Dec. 31, 2024 USD ($)	Nov. 30, 2024	Oct. 31, 2024	Jul. 31, 2024 USD ($)	May 31, 2024	May 31, 2022 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2026	Aug. 31, 2026 KRW (₩)	Jul. 31, 2026 KRW (₩)	Dec. 31, 2024 KRW (₩)	Jul. 31, 2024 KRW (₩)	May 31, 2022 KRW (₩)	Jul. 31, 2016 KRW (₩)
Term loan and security agreement, one \| Kyeongho Lee
Subsequent Event [Line Items]
Principal amount											$ 0.7										₩ 1.0
Term loan and security agreement, one \| Mujin Electronics Co., Ltd.
Subsequent Event [Line Items]
Debt instrument, maturity date				2026-10	2026-04		2025-12		2025-10				2025-06	2025-01
Principal amount														$ 3.7								₩ 5.0
Annual interest rate (as a percent)																		6.80%
Term loan and security agreement, one \| Anapass, Inc [Member]
Subsequent Event [Line Items]
Debt instrument, maturity date								2026-07						2025-07			2024-07
Principal amount																	$ 4.5							₩ 6.0
Annual interest rate (as a percent)																	5.50%							5.50%
Term loan and security agreement, one \| Anapass, Inc [Member] \| Related Party
Subsequent Event [Line Items]
Debt instrument, maturity date																		2026-07
Term loan and security agreement, two \| Kyeongho Lee
Subsequent Event [Line Items]
Debt instrument, maturity date											2025-01	2024-12
Term loan and security agreement, two \| Anapass, Inc [Member]
Subsequent Event [Line Items]
Debt instrument, maturity date						2026-11				2025-11					2025-05	2024-05
Principal amount																$ 2.2							₩ 3.0
Annual interest rate (as a percent)						7.00%										5.50%							5.50%
Term loan and security agreement, two \| Anapass, Inc [Member] \| Related Party
Subsequent Event [Line Items]
Debt instrument, maturity date																		2026-08
Subsequent Event \| i Best Investment Co., Ltd. [Member]
Subsequent Event [Line Items]
Repayment of short term loan		$ 0.6	₩ 1.0
Subsequent Event \| Term loan and security agreement, one \| KEB Hana Bank
Subsequent Event [Line Items]
Debt instrument, maturity date		2027-07	2027-07
Principal amount		$ 5.2																		₩ 8.0
Annual interest rate (as a percent)		5.30%																		5.30%
Subsequent Event \| Term loan and security agreement, one \| Anapass, Inc [Member]
Subsequent Event [Line Items]
Repayment of short term loan		$ 1.3	₩ 2.0
Debt instrument, maturity date		2027-07	2027-07
Principal amount		$ 2.1																		₩ 3.0
Annual interest rate (as a percent)		7.00%																		7.00%
Subsequent Event \| Term loan and security agreement, one \| Anapass, Inc [Member] \| Related Party
Subsequent Event [Line Items]
Repayment of short term loan		$ 1.3	₩ 2.0
Debt instrument, maturity date		2027-07	2027-07
Principal amount		$ 2.6																		₩ 4.0
Subsequent Event \| Term loan and security agreement, one \| Anapass, Inc [Member] \| Maximum \| Related Party
Subsequent Event [Line Items]
Annual interest rate (as a percent)		7.00%																		7.00%
Subsequent Event \| Term loan and security agreement, one \| Anapass, Inc [Member] \| Minimum \| Related Party
Subsequent Event [Line Items]
Annual interest rate (as a percent)		5.50%																		5.50%
Subsequent Event \| Term loan and security agreement, two \| Anapass, Inc [Member]
Subsequent Event [Line Items]
Principal amount	$ 1.4																		₩ 2.0
Subsequent Event \| Term loan and security agreement, two \| Anapass, Inc [Member] \| Related Party
Subsequent Event [Line Items]
Debt instrument, maturity date	2027-08
Subsequent Event \| Term loan and security agreement, two \| Anapass, Inc [Member] \| Maximum
Subsequent Event [Line Items]
Annual interest rate (as a percent)	7.00%																		7.00%
Subsequent Event \| Term loan and security agreement, two \| Anapass, Inc [Member] \| Minimum
Subsequent Event [Line Items]
Annual interest rate (as a percent)	6.50%																		6.50%
Subsequent Event \| Amendment to term loan and security agreement, nine \| Anapass, Inc [Member] \| Maximum
Subsequent Event [Line Items]
Annual interest rate (as a percent)		7.00%																		7.00%
Subsequent Event \| Amendment to term loan and security agreement, nine \| Anapass, Inc [Member] \| Minimum
Subsequent Event [Line Items]
Annual interest rate (as a percent)		6.50%																		6.50%