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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Major classes of inventories
The major classes of inventories were as follows:
March 31, 2022December 31, 2021
Raw materials$28,550 $27,474 
Work in process1,359 582 
Finished goods703 363 
Inventory reserve(3,414)(2,613)
$27,198 $25,806