Annual report pursuant to Section 13 and 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories      
Finished goods $ 10,403 $ 9,194  
Work in process 730 454  
Raw materials 2,728 2,334  
Inventories 13,861 11,982  
Inventory write-downs $ 1,887 $ 1,343 $ 1,438