Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT, NET

7. PROPERTY, PLANT AND EQUIPMENT, NET

Property, plant and equipment, net consisted of the following:

	December 31, 2020			December 31, 2021
Machineries and equipment	$	123,889		$	150,519
Buildings		39,988			41,920
Leasehold improvements		26,627			30,035
Fixtures and electronic equipment		9,086			13,848
Motor vehicles		8,073			8,507
Total		207,663			244,829
Less: accumulated depreciation		(67,043	)		(88,745	)
Construction in progress		57,397			96,973
Property, plant and equipment, net	$	198,017		$	253,057

The Group recorded depreciation expenses of $14,676, $16,097 and $19,975 for the years ended December 31, 2019, 2020 and 2021, respectively. $2,908, $567 and $2,443 impairment losses were recognized for the years ended December 31, 2019, 2020 and 2021, respectively, primarily related to the obsolete machineries and equipment as a result of technology development or product upgrade.