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2. Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 1,678 $ 2,566
Work-in-progress 1,365 1,455
Finished goods 1,773 2,497
Total inventories $ 4,816 $ 6,518