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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of changes in accumulated balances of other comprehensive loss
The following table summarizes the changes in accumulated other comprehensive loss (in thousands):
 
Three Months Ended
 
March 31,
 
2019
 
2018
Beginning balance
$
(4,214
)
 
$
(3,597
)
Other comprehensive loss due to foreign currency translation, net of tax
(89
)
 
(183
)
Ending balance
$
(4,303
)
 
$
(3,780
)