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Share-Based Payments - Compensation expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-Based Compensation
Share-based compensation expenses	$ 3,408	$ 2,362	$ 2,069
Warrants
Share-Based Compensation
Compensation for arranging investors to subscribe for shares	100
Research and development
Share-Based Compensation
Share-based compensation expenses	1,496	1,021	896
General and administrative
Share-Based Compensation
Share-based compensation expenses	$ 1,912	$ 1,341	$ 1,173

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The amount of warrants issued as compensation for arranging investors to subscribe for shares.

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- Definition

The amount of expense from share-based payment transactions with employees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2020-01-01
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