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Reconciliation of Beginning and Ending Amounts of Valuation Allowance on Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Valuation Allowance [Abstract]
Balance at beginning of year	$ 11,880	$ 13,607	$ 13,046
Subsequent reversal and utilization of valuation allowance	(263)	(94)	(81)
Changes to valuation allowance	405	1,158	575
Expirations	(942)	(1,731)	(221)
Exchange differences	(16)	(1,060)	288
Balance at end of year	$ 11,064	$ 11,880	$ 13,607

X

- Definition

Deferred tax assets expirations.

+ References

No definition available.

+ Details

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Namespace Prefix:	gigm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- Definition

Reversal of deferred tax asset valuation allowance.

+ References

No definition available.

+ Details

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Namespace Prefix:	gigm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

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

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration