Summary of significant accounting policies - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2024 USD ($) segment asset_group	Dec. 31, 2023 asset_group
Accounting Policies [Abstract]
Number of operating segments \| segment	1
Number of reportable segments \| segment	1
Restricted cash	$ 9.3
Restricted cash, bank guarantee for future recycling services	5.2
Security deposit	2.8
Cash collateral for borrowed securities	$ 1.3
Finite-lived intangible asset, useful life	3 years
Number of asset groups \| asset_group	2	2

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Restricted Cash, Bank Guarantee For Future Recycling Services

+ References

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Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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