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Reconciliation of Beginning and Ending Amounts of Valuation Allowance on Deferred Tax Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Valuation Allowance [Abstract] |  |  |
Balance at beginning of year | $ 11,064 | $ 11,880 | $ 13,607
Subsequent reversal and utilization of valuation allowance | (663) | (263) | (94)
Changes to valuation allowance | 396 | 405 | 1,158
Expirations | (1,175) | (942) | (1,731)
Exchange differences | (506) | (16) | (1,060)
Balance at end of year | $ 9,116 | $ 11,064 | $ 11,880

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- Definition Deferred tax assets expirations. + References No definition available. + Details
Name: | gigm_DeferredTaxAssetsExpirations
Namespace Prefix: | gigm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Deferred Tax Assets Valuation Allowances Currency Translation Increase Decrease + References No definition available. + Details
Name: | gigm_DeferredTaxAssetsValuationAllowancesCurrencyTranslationIncreaseDecrease
Namespace Prefix: | gigm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reversal of deferred tax asset valuation allowance. + References No definition available. + Details
Name: | gigm_ReversalOfDeferredTaxAssetValuationAllowance
Namespace Prefix: | gigm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ValuationAllowanceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration