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Lease Arrangements - Summary of Right of Use Assets (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Recognition of Right-of-Use Assets
Lessee Lease Description [Line Items]
Cost	$ 1,056
Net	1,056
Recognition of Impairment
Lessee Lease Description [Line Items]
Cost	(1,056)
Net	$ (1,056)

X

- Definition

Right of use assets cost.

+ References

No definition available.

+ Details

Name:	gigm_RightOfUseAssetsCost
Namespace Prefix:	gigm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Right of use assets net.

+ References

No definition available.

+ Details

Name:	gigm_RightOfUseAssetsNet
Namespace Prefix:	gigm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

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

X

- Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=gigm_RecognitionOfRightOfUseAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=gigm_RecognitionOfImpairmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: