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Property and equipment (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]

  As of December 31, 
  2015  2014 
Computer hardware and software $38  $125 
Furniture and fixtures     12 
   38   137 
Less: Accumulated depreciation  (3)  (126)
Property and equipment, net $35  $11