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Marketable Securities - Noncurrent - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares
Investments Debt And Equity Securities [Abstract]
Gains on disposal of marketable securities	$ 125
Gain loss on disposal of marketable security that have been fully impaired	79
Gain on deemed disposal arising from partial conversion of promissory note into preferred shares	$ 46
Conversion price | $ / shares	$ 3.00

X

- Definition

Gain loss on disposal of marketable security that have been fully impaired.

+ References

No definition available.

+ Details

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Namespace Prefix:	gigm_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Gain on deemed disposal arising from partial conversion of promissory note into preferred shares.

+ References

No definition available.

+ Details

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

X

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

+ Details

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Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration