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Derivative Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Derivative Financial Instruments [Abstract]  
Gains (Losses) Related to Derivative Instruments Not Designated as Hedging Instruments
The following table summarizes gains (losses) related to derivative instruments not designated as hedging instruments during the years ended December 31, 2018 and 2017 (U.S. dollars in thousands):

 
Derivatives not designated as
hedging instruments:
   
Location of
Gain (Loss)
Recognized in
Income
   
Amount of Gain (Loss)
Recognized in Income
   
Year Ended December 31,
2018
  2017  
2016
            
Foreign currency contracts
 
Other income (expense)
 $
  
$
(485
)
 
$
39
 
Gains (Losses) Related to Derivative Instruments Designated as Cash Flow Hedges
The following table summarizes gains (losses) related to derivative instruments recorded in other comprehensive income (loss) during the years ended December 31, 2018, 2017 and 2016 (U.S. dollars in thousands):

Derivatives designated as hedging instruments:
 
Amount of Gain (Loss)
Recognized in Other
Comprehensive Loss
 
 
Year Ended December 31,
 
 
2018
  
2017
  
2016
 
          
Foreign currency forward contracts related to intercompany license fee, product sales, and selling expense hedges
 
$
(160
)
 
$
(152
)
 
$
(1,423
)

The following table summarizes gains (losses) relating to derivative instruments reclassified from accumulated other comprehensive loss into income during the years ended December 31, 2018, 2017 and 2016 (U.S. dollars in thousands):

Derivatives designated as hedging instruments:
   
Location of
Gain (Loss)
Reclassified from
Accumulated
Other
Comprehensive
Loss into Income
 
Amount of Gain (Loss) Reclassified
from Accumulated Other
Comprehensive Loss into Income
 
 
Year Ended December 31,
 
 
2018
  
2017
  
2016
 
            
Foreign currency forward contracts related to intercompany license fees and product sales hedges
 
Revenue
 
$
18
  
$
119
  
$
(1,088
)
Foreign currency forward contracts related to intercompany selling expense hedges
 
Selling expenses
 
  
$
358
  
$
(1,544
)