XML 103 R89.htm IDEA: XBRL DOCUMENT v3.22.1

Reconciliation of Beginning and Ending Amounts of Valuation Allowance on Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation Allowance [Abstract]
Balance at beginning of year	$ 13,046	$ 12,732	$ 11,765
Subsequent reversal and utilization of valuation allowance	(81)	(87)	(17)
Changes to valuation allowance	575	1,585	723
Expirations	(221)	(1,720)
Exchange differences	288	536	261
Balance at end of year	$ 13,607	$ 13,046	$ 12,732

X

- 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

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

Name:	gigm_ReversalOfDeferredTaxAssetValuationAllowance
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ 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

Name:	us-gaap_ValuationAllowanceAbstract
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

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