Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		Three months ended June 30,						Six months ended June 30,
		2016			2017			2016			2017
Net loss	$	(2,668,641	)	$	(3,753,380	)	$	(4,571,799	)	$	(5,821,596	)
Weighted average shares used in basic and diluted computation (note)		17,284,432			20,402,083			17,256,932			20,059,236
Loss per share	$	(0.15	)	$	(0.18	)	$	(0.26	)	$	(0.29	)