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Fair value measurements (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Marketable securities:    
Available-for-sale securities, Debt Securities, Current, Total $ 2,979,000 $ 2,947,000
Recurring basis    
Marketable securities:    
Available-for-sale securities, Debt Securities, Current, Total 2,979,000  
Recurring basis | Corporate debt securities    
Marketable securities:    
Available-for-sale securities, Debt Securities, Current, Total 2,979,000  
Recurring basis | Level 1    
Marketable securities:    
Available-for-sale securities, Debt Securities, Current, Total 2,979,000  
Recurring basis | Level 1 | Corporate debt securities    
Marketable securities:    
Available-for-sale securities, Debt Securities, Current, Total $ 2,979,000