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Leases (Tables)
6 Months Ended
Jun. 30, 2019
Leases [Abstract]  
Schedule of undiscounted cash flows for the operating leases [Table Text Block]
      Operating Leases  
         
  2019 Remainder $  74  
  2020   149  
  2021   151  
  2022   155  
  2023   156  
  2024   160  
  Thereafter   187  
  Total undiscounted lease payments   1,032  
  Less: Interest   309  
  Present value of lease liabilities $ 723  
 
Current portion of operating lease liability $135
Operating lease liability $588