Stock-based compensation - Weighted average fair value of options at the date of grant and the intrinsic value of options exercised (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Stock-based compensation
Total intrinsic value of options exercised	$ 109,868	$ 2,482	$ 104,559
Below Market Price
Stock-based compensation
Options granted with an weighted average exercise price	$ 9.59	$ 2.58	$ 12.21
Below Market Price \| Employees \| Preferred stock
Stock-based compensation
Options granted with an weighted average exercise price	9.59	2.58	12.21
At Market Price
Stock-based compensation
Options granted with an weighted average exercise price	10.1	8.5	8.29
At Market Price \| Management employees
Stock-based compensation
Options granted with an weighted average exercise price	0	0	0
At Market Price \| Employees \| Common stock
Stock-based compensation
Options granted with an weighted average exercise price	10.1	8.5	8.29
Above Market Price
Stock-based compensation
Options granted with an weighted average exercise price	0	0	0
Above Market Price \| Management employees
Stock-based compensation
Options granted with an weighted average exercise price	0	0	0
Above Market Price \| Employees \| Preferred stock
Stock-based compensation
Options granted with an weighted average exercise price	$ 0	$ 0	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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