SHARE BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2019

Share Based Compensation

Stock and stock option-based compensation expense

In Thousands of US Dollars
Functional Expense Category	2019		2018		2017
General and administrative expense	$	1,839	$	2,064	$	3,708
Research and development expense		1,172		1,819		2,589
Total	$	3,011	$	3,883	$	6,297