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

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.