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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]  
Forward Contracts and Related Fair Values

The dollar equivalent of the U.S. dollar forward contracts and related fair values as of June 30, 2019 and December 31, 2018 were as follows:

 

 

 

June 30,

2019

 

 

December 31,

2018

 

Notional amount

 

$

1,978

 

 

$

6,746

 

Fair value of liability

 

$

(38

)

 

$

(32

)