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Inventories, Net
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
INVENTORIES, NET

NOTE 4. INVENTORIES, NET

 

Inventories consisted of the following:

 

   December 31,
2021		   March 31,
2022		 
Work in process  $20,760   $23,124 
Raw materials   25,266    26,128 
Finished goods   7,398    8,829 
Total  $53,424   $58,081 

 

Provision for obsolete inventories at $218 and $471 were recognized for the three months ended March 31, 2021 and 2022, respectively.

5. INVENTORIES, NET

 

Inventories consisted of the following:

 

   December 31, 2020   December 31, 2021 
Work in process  $22,167   $20,760 
Raw materials   17,451    25,266 
Finished goods   5,350    7,398 
Total  $44,968   $53,424 

 

Provision for obsolete inventory at $4,233, $1,343 and $18,295 were recognized for the years ended December 31, 2019, 2020 and 2021, respectively, primarily related to the obsolete inventory as a result of technology development or product upgrade.