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Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Carried at Fair Value on a Recurring Basis

The following tables summarize the Company’s financial assets and liabilities that are carried at fair value on a recurring basis, on its consolidated balance sheets:

      December 31, 2018 December 31, 2017
(U.S. $ in thousands)
Assets:      
Foreign exchange forward contracts not designated as hedging instruments $                374 $                90
Foreign exchange forward contracts designated as hedging instruments - 263
 
Liabilities:
Foreign exchange forward contracts not designated as hedging instruments (196 ) (921 )
Foreign exchange forward contracts designated as hedging instruments   (628 )   -  
$ (450 ) $ (568 )