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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive 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
)

There were no amounts reclassified from accumulated other comprehensive income (loss) for the years ended December 31, 2017, 2016 and 2015. Accumulated other comprehensive income (loss) consists of foreign currency translation gain or loss.