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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
(US $ in thousands)

         
Charges
                    
         
(credit)
    
Charges
              
         
to
    
to
              
   
Beginning
    
Costs and
    
other
          
End of
  
   
of year
    
Expenses
    
accounts
    
Deductions
    
Year
  
                               
Allowance for doubtful accounts (1):
                          
Year ended December 31, 2017
  
$
84
    
$
97
    
$
(78
)
  
$
-
    
$
103
  
Year ended December 31, 2018
    
103
      
303
      
(166
)
    
-
      
240
  
Year ended December 31, 2019
    
240
      
261
      
(83
)
    
-
      
418
  
                                         
Allowance for net deferred tax assets:
                                  
Year ended December 31, 2017
  
$
21,269
    
$
-
    
$
-
    
$
(5,368
)
  
$
15,901
  
Year ended December 31, 2018
    
15,901
      
-
      
2,577
      
-
      
18,478
  
Year ended December 31, 2019
    
18,478
      
-
      
2,568
      
-
      
21,046
  

(1) Write-off net of recoveries for the allowance for doubtful accounts.