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Fair value measurement - Narrative (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jul. 18, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investment in convertible promissory note |  | $ 2,000 | $ 0
Convertible Promissory Note |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investment in convertible promissory note | $ 2,000 |  |
Debt instrument, face amount |  | $ 2,000 |

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- Definition The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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