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, 2018
Dec. 31, 2017
Dec. 31, 2016
Inventories      
Finished goods $ 9,194 $ 5,489  
Work in process 454 470  
Raw materials 2,334 1,357  
Inventories 11,982 7,316  
Inventory write-downs $ 1,343 $ 1,438 $ 788