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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of components of accumulated other comprehensive loss
The components of accumulated other comprehensive loss were as follows (in thousands):
 
Currency
Translation
Adjustments
 
Net Unrealized Gains
(Losses) on Available-
for-Sale Securities
 
Accumulated Other
Comprehensive
Loss
Balance, December 31, 2017
$
(323
)
 
$
(78
)
 
$
(401
)
Other comprehensive (loss) income before reclassifications
(66
)
 
10

 
(56
)
Net current-period other comprehensive (loss) income
(66
)
 
10


(56
)
Balance, March 31, 2018
$
(389
)
 
$
(68
)

$
(457
)
Balance, December 31, 2018
$
(347
)
 
$
(4
)
 
$
(351
)
Other comprehensive (loss) income before reclassifications
(9
)
 
(200
)
 
(209
)
Net current-period other comprehensive (loss) income
(9
)
 
(200
)
 
(209
)
Balance, March 31, 2019
$
(356
)
 
$
(204
)
 
$
(560
)