Summary of significant accounting policies - Foreign Currency Translation and Transaction (Details)	Dec. 31, 2024 ¥ / $	Dec. 31, 2024 $ / $	Dec. 31, 2024 € / $	Dec. 31, 2024 ₨ / $	Dec. 31, 2023 ¥ / $	Dec. 31, 2023 $ / $	Dec. 31, 2023 € / $
Accounting Policies [Abstract]
Exchange rate on the balance sheet date	7.3094	1.4384	0.9600	85.4912	7.1006	1.3246	0.9059