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Lease Arrangements - Summary of Right of Use Assets Carrying Amount (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Lessee Lease Description [Line Items] |  |
Right of use assets carrying amount | $ 1,971 |
Office Premise |  |
Lessee Lease Description [Line Items] |  |
Right of use assets carrying amount | $ 1,971 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Right of use assets carrying amount | Right of use assets carrying amount

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

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Indicates line item in statement of financial position that includes operating lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918631-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=gigm_OfficePremisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |