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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Major classes of inventories
The major classes of inventories were as follows:
December 31,
20212020
Raw materials$27,474 $27,157 
Work in process582 1,055 
Finished goods363 3,998 
Inventory reserve(2,613)(2,013)
$25,806 $30,197