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The components of inventories are summarized below: (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 1,834 $ 1,719
Work in process 2,262 1,420
Provision for excess and obsolete inventory (783) (736)
Total inventories $ 3,313 $ 2,403