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INTEREST AND OTHER, NET
 12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
INTEREST AND OTHER, NET INTEREST AND OTHER, NET:
Interest and other, net, is summarized in the following table:
 
Year ended December 31,
 
2019
 
2018
 
2017
 
(in thousands)
Interest expense
$
(149
)
 
$
(2,185
)
 
$
(7,937
)
Interest income and gains on short-term investments, net
15,588

 
5,629

 
3,748

Foreign exchange loss, net
(7,070
)
 
(1,256
)
 
(596
)
Gain on investments in privately-held companies
9,569

 
—

 
—

Impairment of investments in privately-held companies
(1,755
)
 
(1,494
)
 
—

Other
(174
)
 
(557
)
 
(37
)
Interest and other, net
$
16,009

 
$
137

 
$
(4,822
)