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Summary of significant accounting policies (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
segment
$ / shares
Dec. 31, 2021
USD ($)
Segment information    
Number of operating segments | segment 1  
Pensions    
Current investment securities $ 124,831,000  
Current and non-current classification    
Operating cycle period 12 months  
Pension benefits | Lexington    
Pensions    
Amount of employer matching contribution for every employee dollar contributed $ 0.50  
Lexington. | Pension benefits    
Pensions    
Amount contributed to plan (in dollars per share) | $ / shares $ 1.00  
Cash and Cash Equivalents    
Pensions    
Current investment securities $ 21,200,000 $ 0
Maximum | Pension benefits | Lexington    
Pensions    
Percent of employee gross pay for which the employer makes a matching contribution 6.00%  
Leasehold improvements | Minimum    
Property, plant and equipment, net    
Estimated useful life (in years) 10 years  
Leasehold improvements | Maximum    
Property, plant and equipment, net    
Estimated useful life (in years) 15 years  
Laboratory equipment    
Property, plant and equipment, net    
Estimated useful life (in years) 5 years  
Office equipment | Minimum    
Property, plant and equipment, net    
Estimated useful life (in years) 3 years  
Office equipment | Maximum    
Property, plant and equipment, net    
Estimated useful life (in years) 5 years