Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
3. Property, Plant and Equipment
Property, plant and equipment as of June 30, 2022 and December 31, 2021 are comprised of the following (in thousands):
 
    
June 30,
2022
     
December 31,
2021
  
Buildings and related structures
    $ 22,663      $ 24,273  
Machinery and equipment
      97,397        105,300  
Finance lease
right-of-use
assets
      289        316  
Others
      30,554        32,396  
    
 
 
     
 
 
  
       150,903        162,285  
Less: accumulated depreciation
      (92,527 )       (94,119 ) 
Land
      12,744        13,898  
Construction in progress
      25,712        25,818  
    
 
 
     
 
 
  
Property, plant and equipment, net
    $ 96,832      $ 107,882  
    
 
 
     
 
 
  
Aggregate depreciation expenses totaled $7,239 thousand and $6,626 thousand for the six months ended June 30, 2022 and 2021, respectively.