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Inventories
 3 Months Ended
Mar. 31, 2023
Inventories [Abstract]  
Inventories
2. Inventories


Inventories as of March 31, 2023 and December 31, 2022 consist of the following (in thousands):

   
March 31,
2023
    
December 31,
2022
  
Finished goods
  
$
5,523
    
$
6,799
  
Semi-finished goods and work-in-process
    
39,427
      
40,265
  
Raw materials
    
6,351
      
7,460
  
Materials in-transit
    
—
      
36
  
Less: inventory reserve
    
(14,941
)
    
(14,677
)
Inventories, net
  
$
36,360
    
$
39,883
  



Changes in inventory reserve for the three months ended March 31, 2023 and 2022 are as follows (in thousands):


  
Three Months Ended
  
   
March 31,
2023
    
March 31,
2022
  
Beginning balance
  
$
(14,677
)
  
$
(5,730
)
Change in reserve
                
Inventory reserve charged to costs of sales
    
(2,584
)
    
(1,607
)
Sale of previously reserved inventory
    
1,476
      
1,452
  
     
(1,108
)
    
(155
)
Write off
    
415
      
211
  
Translation adjustments
    
429
      
119
  
Ending balance
  
$
(14,941
)
  
$
(5,555
)



Inventory reserve represents the Company’s best estimate in value lost due to excessive inventory level, physical deterioration, obsolescence, changes in price levels, or other causes based on individual facts and circumstances. Inventory reserve relates to inventory items including finished goods, semi-finished goods, work-in-process and raw materials. Write off of this reserve is recognized only when the related inventory has been disposed or scrapped.