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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
Foreign currency translation adjustment
 
Unrealized gain (loss) on available-for-sale debt securities
 
Accumulated Other Comprehensive Income (Loss)
Beginning balance at December 31, 2017
$
(1,818
)
 
$
(3
)
 
$
(1,821
)
Change during January - June 2018
(188
)
 
4

 
(184
)
Balance at June 30, 2018
$
(2,006
)
 
$
1

 
$
(2,005
)