Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT, NET

6. PROPERTY, PLANT AND EQUIPMENT, NET

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

	December 31, 2019			December 31, 2020
Machineries and equipment	$	73,535		$	123,889
Buildings		37,479			39,988
Leasehold improvements		22,571			26,627
Fixtures and electronic equipment		7,459			9,086
Motor vehicles		4,641			8,073
Total		145,685			207,663
Less: accumulated depreciation		(46,243	)		(67,043	)
Construction in progress		91,881			57,397
Property, plant and equipment, net	$	191,323		$	198,017

The Group recorded depreciation expenses of $12,180, $14,676 and $16,097 for the years ended December 31, 2018, 2019 and 2020, respectively. $1,239, $2,908 and $567 impairment losses were recognized for the years ended December 31, 2018, 2019 and 2020, respectively, primarily related to the obsolete machineries and equipment as a result of technology development or product upgrade.