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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	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024
Asset impairment and losses (gains) on transactions
Gain (loss) on sale of fixed assets		$ (3,772)
Tangible asset impairment	$ 200	168
Gain on lease terminations	2,200	2,179
Early-stage gene therapy program assets
Asset impairment and losses (gains) on transactions
Gain (loss) on sale of fixed assets	4,200	4,200
Other fixed assets
Asset impairment and losses (gains) on transactions
Gain (loss) on sale of fixed assets	$ 400	$ 400

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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-Name Accounting Standards Codification
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Amount of gain (loss) on termination of lease before expiration of lease term.

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-Topic 842
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-Name Accounting Standards Codification
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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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