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Schedule of Valuation and Qualifying Accounts
12 Months Ended
Dec. 31, 2020
Schedule of Valuation and Qualifying Accounts
Column A
 
Column B
   
Column C
   
Column D
   
Column E
 
   
Balance at
beginning
of period
   
Charged to costs
and expenses
   
Charged to other
accounts
   
Deductions
   
Balance at end
of period
 
Allowance for doubtful accounts:
         
Year ended December 31, 2020
  $ 209     $ (11   $ 2     $       $ 200  
 
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Year ended December 31, 2019
  $ 232     $ (16   $ —       $ (7   $ 209  
 
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Year ended December 31, 2018
  $ 232     $ 13     $ (9   $ (4   $ 232  
 
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Allowance in respect of carryforward tax losses and deductions that may not be utilized:
         
Year ended December 31, 2020
  $ 1,974     $ 670     $ —       $ (97   $ 2,547  
 
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Year ended December 31, 2019
  $ 1,633     $ 555     $ —       $ (214   $ 1,974  
 
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Year ended December 31, 2018
  $ 1,504     $ 407     $ 5     $ (283   $ 1,633