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.