Related parties (Details)		3 Months Ended	6 Months Ended
	Jun. 14, 2026 USD ($) tranche $ / shares shares	Jun. 30, 2026 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Mar. 18, 2026 USD ($)
Related Party Transaction [Line Items]
Proceeds from working capital note			$ 11,750,000	$ 0
Sale of stock, number of tranches | tranche	3
Sale of stock price, (usd per share) | $ / shares	$ 3.89
PIPE subscription deposit		$ 8,500,000	8,500,000
Apeiron Investment Group Limited | Sale of Stock, Tranche Two
Related Party Transaction [Line Items]
PIPE subscription deposit		8,500,000	8,500,000
Related Party | Apeiron Investment Group Limited
Related Party Transaction [Line Items]
Number of shares issued (in shares) | shares	5,141,388
Aggregate consideration	$ 20,000,000.0
Chief Executive Officer
Related Party Transaction [Line Items]
Number of shares issued (in shares) | shares	1,285,347
Aggregate consideration	$ 5,000,000.0
Working Capital Note | Line of Credit | Related Party
Related Party Transaction [Line Items]
Line of credit maximum commitment amount					$ 20,000,000.0
Line of credit, interest rate					5.00%
Trust account threshold requiring mandatory prepayment of outstanding borrowings					$ 20,000,000.0
Proceeds from working capital note		11,800,000
Amount outstanding		0	0
Interest expense		$ 79,760	$ 79,760