SHARE BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2020

Summary of stock option-based compensation expense

In Thousands of US Dollars
Functional Expense Category	2020		2019		2018
General and administrative expense	$	702	$	1,839	$	2,064
Research and development expense		1,046		1,172		1,819
Total	$	1,748	$	3,011	$	3,883