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Related-party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Related party transactions [abstract]  
Disclosure of detailed information about transactions between related parties [Text Block]
The Company made an interest-free loan to VST and Emza for their short-term funding needs. The information is summarized as follows:
 
 
 
January 1,
2017
 
 
December 31,
2017
 
 
December 31,
2018
 
 
 
(in thousands)
 
 
 
 
 
VST
 
$
7,150
 
 
 
2,750
 
 
 
2,780
 
Emza
 
 
-
 
 
 
500
 
 
 
-
 
 
 
$
7,150
 
 
 
3,250
 
 
 
2,780
 
Disclosure of detailed information about key management personnel services provided by separate management entities [Text Block]
The compensation to key management personnel for the years ended December 31, 2017 and 2018 were as follows:
 
  
Year ended December 31,
 
  
2017
  
2018
 
  
(in thousands)
 
Short-term employee benefits $829   855 
Post-employment benefits  7   7 
Share-based compensation  226   41 
  $
1,062
   
903