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INVENTORIES, NET
12 Months Ended
Dec. 31, 2022
Inventory Disclosure [Abstract]  
INVENTORIES, NET
5. INVENTORIES, NET
Inventories consisted of the following:
December 31,
2021
December 31,
2022
Work in process$20,760 $48,747 
Raw materials25,266 29,331 
Finished goods7,398 6,174 
Total$53,424 $84,252 
Provision for obsolete inventory of $1,343, $18,295 and $4,789 were recognized for the years ended December 31, 2020, 2021 and 2022, respectively, primarily related to inventory becoming obsolete as a result of technology development or product upgrade.