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Lease Arrangements - Schedule of Future Minimum Lease Payments Under Lease Agreements (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
Not later than 1 year	$ 450
Later than 1 year and not later than 5 years	504
Balance at end of year	$ 954

X

- Definition

Operating leases future minimum lease payments due in later than one year and not later than five years.

+ References

No definition available.

+ Details

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X

- Definition

Operating leases future minimum lease payments due in not later than one year.

+ References

No definition available.

+ Details

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Namespace Prefix:	gigm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41502-112717

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=121580752&loc=d3e38371-112697

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