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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in accumulated balances of other comprehensive loss (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Beginning balance
$
(3,787
)
 
$
(3,908
)
 
$
(2,602
)
Other comprehensive income (loss) due to foreign currency translation, net of tax
190

 
121

 
(1,306
)
Ending balance
$
(3,597
)
 
$
(3,787
)
 
$
(3,908
)