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Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2017
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 

 

  Three months ended September 30,     Nine months ended September 30,  
 

 

  2016     2017     2016     2017  
 

Net loss

$ (5,947,722 ) $ (4,202,753 ) $ (10,519,521 ) $ (10,024,349 )
 

 

                       
 

Weighted average shares used in basic and diluted computation (note)

  17,339,426     26,334,918     17,284,632     22,174,315  
 

 

                       
 

Loss per share

$ (0.34 ) $ (0.16 ) $ (0.61 ) $ (0.45 )