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Summary of significant accounting policies, Leases (Details) - USD ($)
$ in Millions
Apr. 20, 2021
Feb. 28, 2020
Dec. 31, 2021
Minimum [Member]      
Leases [Abstract]      
Remaining lease terms     1 year
Maximum [Member]      
Leases [Abstract]      
Remaining lease terms     5 years
Facility in Ithaca, New York [Member]      
Leases [Abstract]      
Increase (decrease) in right-of-use-asset   $ 1.5  
Increase (decrease) in operating lease liability   $ 1.5  
Extension period for leases     4 years
Facility in Hamden, Connecticut [Member]      
Leases [Abstract]      
Increase (decrease) in right-of-use-asset $ (0.3)    
Increase (decrease) in operating lease liability $ (0.3)