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Financial Assets at Amortized Cost (Tables)
12 Months Ended
Dec. 31, 2018
Financial Assets At Amortized Cost [Abstract]  
Disclosure of detailed information about financial assets at amortized cost [Text Block]
 
 
January 1,
2017
 
 
December 31,
2017
 
 
December 31,
2018
 
 
 
(in thousands)
 
Time deposit with original maturities more than three months
 
$
5,140
 
 
 
10,358
 
 
 
11,229