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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING REVENUES      
Sales Revenue Net $ 6,875 $ 6,645 $ 7,101
Type of Revenue [Extensible List]     gigm:DigitalEntertainmentServiceRevenuesMember
COSTS OF REVENUES      
Cost of goods and services sold (2,956) (3,064) $ (3,585)
Type of Cost, Good or Service [Extensible List]     gigm:DigitalEntertainmentServiceRevenuesMember
GROSS PROFIT 3,919 3,581 $ 3,516
OPERATING EXPENSES      
Product development and engineering expenses (1,327) (1,186) (1,091)
Selling and marketing expenses (1,618) (1,995) (3,297)
General and administrative expenses (3,121) (3,182) (3,684)
Impairment loss on property, plant and equipment (Note 4)   (109)  
Impairment loss on intangible assets (Note 4)   (15)  
Impairment loss on prepaid licensing and royalty fees (Notes 3 and 4) 0 (85) (244)
Bad debt expense (Note 6) (5) (24) (23)
Operating Expenses (6,071) (6,596) (8,339)
LOSS FROM OPERATIONS (2,152) (3,015) (4,823)
NON-OPERATING INCOME (EXPENSES)      
Interest income 613 1,483 1,302
Foreign exchange gain (loss), net 199 (68) 267
Other 47 (59) 61
Nonoperating Income (Expense), Total 859 1,356 1,630
LOSS BEFORE INCOME TAXES (1,293) (1,659) (3,193)
NET LOSS ATTRIBUTABLE TO SHAREHOLDERS OF GIGAMEDIA $ (1,293) $ (1,659) $ (3,193)
LOSS PER SHARE ATTRIBUTABLE TO GIGAMEDIA      
Basic and Diluted: $ (0.12) $ (0.15) $ (0.29)
WEIGHTED AVERAGE SHARES USED TO COMPUTE LOSS PER SHARE ATTRIBUTABLE TO GIGAMEDIA SHAREHOLDERS (Note 2)      
Basic 11,052 11,052 11,052
Diluted 11,052 11,052 11,052