Inventories
 6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Inventories
2. Inventories
Inventories as of June 30, 2022 and December 31, 2021 consist of the following (in thousands):
 
 
  
June 30,
2022
 
  
December 31,
2021
 
Finished goods
    $ 5,397      $ 9,594  
Semi-finished goods and
work-in-process
      30,443        25,968  
Raw materials
      10,305        9,443  
Materials
in-transit
      229        95  
Less: inventory reserve
      (10,206 )       (5,730 ) 
    
 
 
     
 
 
  
Inventories, net
    $ 36,168      $ 39,370  
    
 
 
     
 
 
  
Changes in inventory reserve for the three and six months ended June 30, 2022 and 2021 are as follows (in thousands):
 
 
  
Three Months
Ended
 
  
Six Months
Ended
 
  
Three Months
Ended
 
  
Six Months
Ended
 
 
  
 
 
  
 
 
  
 
 
  
 
 
 
  
June 30, 2022
 
  
June 30, 2021
 
Beginning balance
    $ (5,555 )     $ (5,730 )     $ (6,281 )     $ (5,901 ) 
Change in reserve
                                    
Inventory reserve charged to costs of sales
      (6,093 )       (7,700 )       (3,186 )       (5,350 ) 
Sale of previously reserved inventory
      872        2,324        1,343        1,977  
    
 
 
     
 
 
     
 
 
     
 
 
  
       (5,221 )       (5,376 )       (1,843 )       (3,373 ) 
Write off
      84        295        28        930  
Translation adjustments
      486        605        (5 )       243  
    
 
 
     
 
 
     
 
 
     
 
 
  
Ending balance
    $ (10,206 )     $ (10,206 )     $ (8,101 )     $ (8,101 ) 
    
 
 
     
 
 
     
 
 
     
 
 
  
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.