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Summary of significant accounting policies - Tangible Asset Impairment and Losses (Gains) on Transactions, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Asset impairment and losses (gains) on transactions    
Gain (loss) on sale of fixed assets   $ (4,298)
Tangible asset impairment   1,486
Gain on lease terminations   2,179
South Plainfield, New Jersey office    
Asset impairment and losses (gains) on transactions    
Tangible asset impairment $ 1,300 1,500
Early-stage gene therapy program assets    
Asset impairment and losses (gains) on transactions    
Gain (loss) on sale of fixed assets   4,400
Other fixed assets    
Asset impairment and losses (gains) on transactions    
Gain (loss) on sale of fixed assets $ (500) $ 100