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The components of inventories are summarized below (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 1,840	$ 1,719
Work in process	2,457	1,420
Provision for excess and obsolete inventory	(797)	(736)
Total inventories	$ 3,500	$ 2,403

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