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Other income, net (Tables)
 6 Months Ended
Jun. 30, 2019
Other Income and Expenses [Abstract]  
Schedule of Other Income, Net
 
 
THREE MONTHS ENDED

JUNE 30,
 
 
SIX MONTHS ENDED

JUNE 30,
 
(in thousands)
 
 
2019
 
 
2018
 
 
2019
 
 
2018
 
Interest income
 
$
436
 
 
$
376
 
 
$
886
 
 
$
624
 
Foreign exchange losses
 
 
(9
)
 
 
(30
)
 
 
(7
)
 
 
(31
)
Miscellaneous expenses
 
 
—
 
 
 
(118
)
 
 
(1
)
 
 
(171
)
 
 
$
427
 
 
$
228
 
 
$
878
 
 
$
422