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Summary of significant accounting policies, Leases (Details) - USD ($)
$ in Millions
Apr. 26, 2022
Dec. 31, 2023
Minimum [Member]    
Leases [Abstract]    
Remaining lease terms   1 year
Maximum [Member]    
Leases [Abstract]    
Remaining lease terms   4 years
Facility in Las Vegas, Nevada [Member]    
Leases [Abstract]    
Increase in right-of-use-asset $ 0.8  
Increase in operating lease liability $ 0.8