XML 212 R194.htm IDEA: XBRL DOCUMENT
v3.24.1.1.u2

FAIR VALUE MEASUREMENT - Change in the Fair Value of the Warrant Liabilities (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023
Changes in the fair value of the warrant |  |  |  |  |
Change in fair value of warrants subject to forfeiture | $ 4,626,000 |  |  |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) |  |  | Interest Expense
CONCORD ACQUISITION CORP III |  |  |  |  |
Changes in the fair value of the warrant |  |  |  |  |
Public Warrants reclassified to level 1 |  |  | $ (2,383,000) | $ (1,812,200) | $ (2,383,000)
Change in fair value of warrants subject to forfeiture |  |  | 2,913,800 | $ (21,332,800) |
Extinguishment of debt |  |  | $ (3,343,000) |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Change in fair value of warrants subject to forfeiture | Change in fair value of warrants subject to forfeiture |
CONCORD ACQUISITION CORP III | Public And Private Placement Warrants | Level 3 |  |  |  |  |
Changes in the fair value of the warrant |  |  |  |  |
Fair value as of beginning of period | $ 658,000 | $ 639,200 | $ 639,200 | $ 18,655,000 | 18,655,000
Public Warrants reclassified to level 1 |  |  |  | (6,727,500) |
Change in fair value of warrants subject to forfeiture |  |  | (191,760) | (11,288,300) |
Change in fair value of convertible promissory notes |  |  | 210,560 |  |
Fair value as of end of period |  |  | 658,000 | 639,200 | 658,000
CONCORD ACQUISITION CORP III | Sponsor Loans | Level 3 |  |  |  |  |
Changes in the fair value of the warrant |  |  |  |  |
Fair value as of beginning of period |  | $ 1,000,000 | 1,000,000 | 5,490,000 | $ 5,490,000
Change in fair value of warrants subject to forfeiture |  |  |  | (4,490,000) |
Change in fair value of convertible promissory notes |  |  | 2,343,000 |  |
Extinguishment of debt |  |  | $ (3,343,000) |  |
Fair value as of end of period |  |  |  | $ 1,000,000 |

X
- Definition Amount of increase (decrease) in equity for freestanding written call option classified as equity from modification recognized as debt extinguishment or troubled debt restructuring related to debt modification. Includes, but is not limited to, exchange by issuer and holder. Excludes share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 35 -Paragraph 17 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480299/815-40-35-17 + Details
Name: | us-gaap_EquityClassifiedWrittenCallOptionModificationDebtModificationIncreaseDecreaseInEquityAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 25 -Paragraph 13 -SubTopic 10 -Topic 480 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481766/480-10-25-13 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indicates line item in statement in which net income is reported that includes gain (loss) from liability measured at fair value using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value of shares that would be issued, determined under the conditions specified in the contract if the settlement were to occur at the reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481648/480-10-50-2 + Details
Name: | us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsFairValueOfShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=gcts_ConcordAcquisitionCorpIiiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=gcts_PublicAndPrivatePlacementWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=gcts_SponsorLoanWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |