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Stock options plan (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Stock-based compensation expenses     $ 102 $ 1,067
Research and Development Expense [Member]        
Stock-based compensation expenses $ 26   47  
General and Administrative Expense [Member]        
Stock-based compensation expenses $ 23 $ 1,022 55 $ 1,022
Common Stock [Member]        
Stock-based compensation expenses      
Equity Option [Member]        
Number of option shares 8,762,843   8,762,843  
Share issued price per share $ 0.32   $ 0.32  
Number of option to vested, shares     6,069,579  
Stock Option One [Member]        
Number of option shares 480,000   480,000  
Share issued price per share $ 0.01   $ 0.01  
Stock Option Two [Member]        
Number of option shares 200,000   200,000  
Share issued price per share $ 0.64   $ 0.64  
Maximum [Member]        
Warrants and rights outstanding term 10 years   10 years  
Maximum [Member] | Common Stock [Member]        
Warrants and rights outstanding term 5 years   5 years  
Minimum [Member]        
Warrants and rights outstanding term 3 years   3 years  
Minimum [Member] | Common Stock [Member]        
Warrants and rights outstanding term 1 year   1 year  
Employees [Member] | Maximum [Member]        
Number of option to purchase shares     9,442,843