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Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Prepaid expenses and other current assets    
Prepayments and accrued income $ 5,294 $ 5,887
Employee retention and payroll tax credit 53 48
Lease incentive receivable   1,770
Others 549 563
Total $ 5,896 $ 8,268