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OTHER INCOME, NET: (Tables)
 3 Months Ended
Mar. 31, 2017
Other Income and Expenses [Abstract]  
Schedule of other income, net
Other income, net is summarized in the following table:
 
Three Months Ended March 31,
 
2017
 
2016
 
(in thousands)
Interest income and gains (losses) on short-term investments, net
$
878

 
$
115

Foreign exchange loss, net
(162
)
 
(9
)
Other
(33
)
 
(45
)
Other income, net
$
683

 
$
61