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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income, Net of Related Taxes
The following table shows the components of accumulated other comprehensive income (loss), net of taxes, as of December 31, 2018 and 2017 (in thousands): 
 
December 31, 
2018
 
December 31, 
2017
Foreign currency translation adjustments
$
(6,897
)
 
$
567

Unrealized loss on available-for-sale securities
—

 
(1
)
Defined benefit pension plan adjustment
(229
)
 
(168
)
 
$
(7,126
)
 
$
398