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OTHER INCOME (LOSS), NET
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
OTHER INCOME (LOSS), NET
OTHER INCOME (LOSS), NET:
Other income (loss), net, is summarized in the following table:
 
Year ended December 31,
 
2017
 
2016
 
2015
 
(in thousands)
Interest income and gains (losses) on short-term investments, net
$
3,748

 
$
2,244

 
$
2,998

Foreign exchange loss, net
(596
)
 
(840
)
 
(186
)
Impairment of investment in a privately-held company
—

 
—

 
(3,189
)
Other
(37
)
 
(314
)
 
(147
)
Total other income (loss), net
$
3,115

 
$
1,090

 
$
(524
)