The number of shares of private placement warrant issuable at closing.

No definition available.

Name:	gcts_BusinessAcquisitionPrivatePlacementWarrantsIssuableAtClosingNumberOfShares
Namespace Prefix:	gcts_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum threshold period during which a written notice is required for redemption of warrants, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	gcts_ClassOfWarrantOrRightMinimumThresholdWrittenNoticePeriodForRedemptionOfWarrants
Namespace Prefix:	gcts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of the entity's common stock which would be required to be attained to trigger the redemption of warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	gcts_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Threshold number of specified trading days for stock price trigger considered for redemption of warrants.

+ References

No definition available.

+ Details

Name:	gcts_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsThresholdTradingDays
Namespace Prefix:	gcts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Redemption price per share or per unit of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	gcts_ClassOfWarrantOrRightRedemptionPriceOfWarrantsOrRights
Namespace Prefix:	gcts_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of trading days on which fair market value of shares is reported.

+ References

No definition available.

+ Details

Name:	gcts_CommonStockTradingDaysOnWhichFairMarketValueOfSharesIsReported
Namespace Prefix:	gcts_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The period of time after filing within which the registration statement filed with the SEC is expected to become effective.

+ References

No definition available.

+ Details

Name:	gcts_PeriodOfTimeWithinWhichRegistrationStatementIsExpectedToBecomeEffective
Namespace Prefix:	gcts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The value represents the redemption period.

+ References

No definition available.

+ Details

Name:	gcts_RedemptionPeriod
Namespace Prefix:	gcts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of business days before sending notice of redemption to warrant holders.

+ References

No definition available.

+ Details

Name:	gcts_ThresholdNumberOfBusinessDaysBeforeSendingNoticeOfRedemptionToWarrantHolders
Namespace Prefix:	gcts_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

In the event of dilution of the warrant, the multiple to be applied to the higher of the market price or the price of newly issued shares in order to obtain the adjusted exercise price.

+ References

No definition available.

+ Details

Name:	gcts_WarrantExercisePriceAdjustmentMultiple
Namespace Prefix:	gcts_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum trading price for the reporting entity's stock which must be achieved as a condition for redemption of the warrant.

+ References

No definition available.

+ Details

Name:	gcts_WarrantRedemptionConditionMinimumSharePrice
Namespace Prefix:	gcts_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfWarrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=gcts_ConcordAcquisitionCorpIiiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=gcts_SponsorEarnoutSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
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STOCKHOLDERS' DEFICIT - Warrants (Details) - CONCORD ACQUISITION CORP III		12 Months Ended
	Nov. 02, 2023 USD ($) shares	Dec. 31, 2023 D $ / shares shares	Nov. 08, 2021 $ / shares
STOCKHOLDERS' DEFICIT
Purchase price, per unit		$ 10.20	$ 10.00
Sponsor Earnout Shares
STOCKHOLDERS' DEFICIT
Number of shares to be private placement warrants issued at closing \| shares	2,820,000	2,820,000
Gain on Warrants \| $	$ 169,200
Class A common stock
STOCKHOLDERS' DEFICIT
Number of shares issuable per warrant \| shares		1
Warrants
STOCKHOLDERS' DEFICIT
Threshold trading days for redemption of public warrants		20 days
Period of time within which registration statement is expected to become effective		60 days
Warrants \| Class A common stock
STOCKHOLDERS' DEFICIT
Purchase price, per unit		$ 11.50
Warrants \| Redemption of warrants when the price per share of Class A common stock equals or exceeds $18.00
STOCKHOLDERS' DEFICIT
Threshold trading days for redemption of public warrants		20 days
Stock price trigger for redemption of public warrants		$ 18.00
Redemption price per public warrant (in dollars per share)		$ 0.01
Minimum threshold written notice period for redemption of public warrants		30 days
Redemption period		30 days
Threshold number of business days before sending notice of redemption to warrant holders \| D		30
Warrants \| Redemption of warrants when the price per share of Class A common stock equals or exceeds $10.00
STOCKHOLDERS' DEFICIT
Stock price trigger for redemption of public warrants		$ 10.00
Redemption price per public warrant (in dollars per share)		$ 0.10
Redemption period		30 days
Warrant redemption condition minimum share price		$ 10.00
Number of trading days on which fair market value of shares is reported \| D		30
Warrant exercise price adjustment multiple		0.361