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Prepaid and other current assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Prepaid and other current assets    
Prepayments and accrued income $ 5,887 $ 4,612
Value Added Tax receivable   705
Employee retention and payroll tax credit 48 150
Lease incentives receivable 1,770  
Others 563 995
Total $ 8,268 $ 6,462