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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
 
December 31,
 
2017
 
2016
Unrealized loss on investments
$
(2
)
 
$
(89
)
Loss on foreign currency translation adjustments
(15,552
)
 
(36,113
)
Total accumulated other comprehensive loss
$
(15,554
)
 
$
(36,202
)