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Shareholders' Equity - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2024 Vote
Equity [Abstract] |
Number of votes per share | 1

X
- Definition Number of votes per share. + References No definition available. + Details
Name: | gigm_NumberOfVotesPerShare
Namespace Prefix: | gigm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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