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Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]      
Fair value adjustment, tax $ (190) $ (246) $ 803
Net (loss) income arising from retirement benefit obligations, tax (359) (64) 259
Amortization of loss included in net income, tax $ (39) $ (45) $ (52)