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Trade and Other Receivables - Summary of Loss Allowance and Impairment Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Trade and Other Receivables [Line Items]      
Beginning balance $ (341) $ (807)  
Decrease / (Increase) in loss allowance for trade receivables (33) (232)  
Reversals for decrease in loss rate 52 698  
Ending balance (322) (341) $ (807)
Net impairment (loss)/gain on financial assets $ (33) $ 808 $ (807)