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Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 11,636 $ 11,456 $ (77,800) $ 20,979
Retirement benefit reserves 37 4 29 6
Foreign currency translation adjustments (3,957) 1,695 (5,296) 2,702
Comprehensive income (loss) $ 7,716 $ 13,155 $ (83,067) $ 23,687