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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
(US $in thousands)
 
   
Beginning
of year
    
Charges
to
Costs and
Expenses
    
Charges
to
other
accounts
    
Deductions
    
End of
Year
  
                               
Allowance for doubtful accounts (1):
                              
Year ended December 31, 2019      
 
$
240
      
261
      
(83
)
    
-
    
$
418
  
Year ended December 31, 2020      
 
$
418
      
710
      
(438
)
    
-
    
$
690
  
Year ended December 31, 2021      
 
$
690
      
864
      
(563
)
    
-
    
$
991
  
                                         
Allowance for net deferred tax assets:
                                        
Year ended December 31, 2019      
 
$
18,478
      
-
      
2,568
      
-
    
$
21,046
  
Year ended December 31, 2020      
 
$
21,046
      
-
      
-
      
(3,601
)
  
$
17,445
  
Year ended December 31, 2021      
 
$
17,445
      
-
      
-
      
(5,815
)
  
$
11,630
  
 
(1) Write-off net of recoveries for the allowance for doubtful accounts.