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Inventories (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Inventories    
Finished goods $ 838 $ 593
Raw materials 5,738 5,412
Inventories 6,576 6,005
Inventory write-down:    
Balance at beginning of the year 0  
Additions (7)  
Inventories $ 6,569 $ 6,005