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Summary of significant accounting policies - Manufacturing Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenue recognition          
Revenue $ 186,704,000 $ 213,808,000 $ 396,822,000 $ 434,190,000  
Remaining performance obligations 0   0   $ 800,000
Manufacturing revenue          
Revenue recognition          
Revenue 301,000 $ 2,363,000 1,661,000 $ 4,351,000  
Contract with customer, asset 0   0   200,000
Remaining performance obligations $ 0   $ 0   $ 800,000