Fair value measurement - Schedule of the Changes in Fair Value of Convertible Promissory Note (Details) - Convertible Promissory Note $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 2,000
Change in fair value, inclusive of accrued interest income, recognized in net income (loss) from continuing operations	41
Total	$ 2,041