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Deferred Revenue - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Deferred Revenue [Abstract]
Breakage amount recognized as revenue	$ 51	$ 63
Cumulative breakage amount recognized as revenue			$ 346

X

- Definition

Breakage amount recognized as revenue.

+ References

No definition available.

+ Details

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

X

- Definition

Cumulative breakage amount recognized as revenue.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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