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Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Comprehensive Income [Abstract] |  |  |
Fair value adjustment, tax | $ (803) | $ 347 | $ 38
Net (loss) income arising from retirement benefit obligations, tax | (259) | (251) | 93
Amortization of loss included in net income, tax | $ 52 | $ 34 | $ 23

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