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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current:    
Raw materials $ 847 $ 1,795
Finished goods 10,594 11,433
Total 11,441 13,228
Long-term:    
Raw materials 1,915 2,165
Finished goods 4,369 6,788
Total $ 6,284 $ 8,953