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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
(US $ in thousands)

         
Charges
    
Charges
              
         
to
    
to
              
   
Beginning
    
Costs and
    
other
          
End of
  
   
of year
    
Expenses
    
accounts
    
Deductions
    
Year
  
                               
Allowance for doubtful accounts (1):
                          
Year ended December 31, 2018
  
$
103
      
303
      
(166
)
    
-
     $
240
  
Year ended December 31, 2019
   $
240
      
261
      
(83
)
    
-
     $
418
  
Year ended December 31, 2020
  
$
418
      
710
      
(438
)
    
-
     $
690
  
                                         
Allowance for net deferred tax assets:
                                  
Year ended December 31, 2018
  
$
15,901
      
-
      
2,577
      
-
     $
18,478
  
Year ended December 31, 2019
   $
18,478
      
-
      
2,568
      
-
     $
21,046
  
Year ended December 31, 2020
  
$
21,046
      
-
      
-
      
(3,601
)
   $
17,445
  
                                         
(1) Write-off net of recoveries for the allowance for doubtful accounts.