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Document and Entity Information
 12 Months Ended
Dec. 31, 2024
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2024
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Trading Symbol GIGM
Security Exchange Name NASDAQ
Entity Registrant Name GIGAMEDIA Ltd
Entity Incorporation, State or Country Code U0
Entity Central Index Key 0001105101
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company false
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Common Stock, Shares Outstanding 11,052,235
Title of 12(b) Security Ordinary Shares
Entity File Number 000-30540
Entity Address, Address Line One 8 TH FLOOR, NO. 22
Entity Address, Address Line Two LANE 407
Entity Address, Address Line Three SECTION 2 TIDING BOULEVARD
Entity Address, City or Town TAIPEI
Entity Address, Country TW
Entity Address, Postal Zip Code 114-740
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard U.S. GAAP
Auditor Firm ID 1060
Auditor Name Deloitte & Touche
Auditor Location Taipei, Taiwan
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of GigaMedia Limited and subsidiaries (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of operations and comprehensive income (loss), changes in shareholders’ equity, and cash flows for each of the three years in the period ended December 31, 2024, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the result of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 8 TH FLOOR, NO. 22
Entity Address, Address Line Two LANE 407
Entity Address, Address Line Three SECTION 2 TIDING BOULEVARD
Entity Address, City or Town TAIPEI
Entity Address, Country TW
Entity Address, Postal Zip Code 114-740
Contact Personnel Name CHENG-MING HUANG
City Area Code 886
Local Phone Number 2-2656-8000
Contact Personnel Fax Number 2-2656-8003