Property, Plant and Equipment

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

6. Property, Plant and Equipment

Property, plant and equipment as of December 31, 2021 and 2020 are comprised of the following (in thousands):

	December 31,
	2021			2020
Buildings and related structures	$	24,273		$	24,882
Machinery and equipment		105,300			106,244
Finance lease right-of-use assets		316			344
Others		32,396			31,208
		162,285			162,678
Less: accumulated depreciation		(94,119	)		(90,370	)
Land		13,898			15,167
Construction in progress		25,818			8,908
Property, plant and equipment, net	$	107,882		$	96,383

Aggregate depreciation expenses totaled $13,495 thousand, $10,448 thousand and $9,720 thousand for the years ended December 31, 2021, 2020 and 2019, respectively.