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Inventories
 3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
Inventory, net of write-downs, as of March 31, 2022 and December 31, 2021 were as follows (in thousands):

March 31, 2022December 31, 2021
(unaudited)
Raw materials$1,810 $1,544 
Work in-process2,432 2,447 
Finished goods12 94 
Total inventory, net$4,254 $4,085 

The Company's inventory as of March 31, 2022 and December 31, 2021 was written down by $966 and $1,122, respectively, in order to reduce inventory to the lower of cost or to its net realizable value.