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Inventories - Net loss incurred on valuation of inventory (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Inventories        
Net loss incurred on valuation of inventory at lower of cost or market value and write-off of obsolete inventory $ 27 $ 307 $ 27 $ 682