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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities carried at fair value on a recurring basis
 September 30, 2020 December 31, 2019
 (U.S. $ in thousands)
Assets:   
Foreign exchange forward contracts not designated as hedging instruments$100  $63 
Foreign exchange forward contracts designated as hedging instruments 220   315 
    
Liabilities:   
Foreign exchange forward contracts not designated as hedging instruments (534  (388
Foreign exchange forward contracts designated as hedging instruments (552  (326
 $(766$(336