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Equity - Stock options - Compensation cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based compensation
Compensation cost, Effect on loss	$ 748,000	$ 568,000
Effect on net loss per share (in dollars per share)	$ 0.03	$ 0.02
Research and development
Share-based compensation
Compensation cost, Effect on loss	$ 83,000	$ 174,000
General and administrative
Share-based compensation
Compensation cost, Effect on loss	$ 665,000	$ 394,000

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- Definition

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