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Income (Loss) Before Income Taxes by Geographic Location (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting [Abstract]      
Taiwan operations $ (1,129) $ (2,191) $ (3,146)
Non-Taiwan operations (164) 532 (47)
LOSS BEFORE INCOME TAXES $ (1,293) $ (1,659) $ (3,193)