Related party transactions - Schedule Of Allocations Are Reflected Statements Of Operations (Details) - USD ($) |
3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Feb. 25, 2026 |
Jun. 30, 2026 |
Jun. 30, 2026 |
Dec. 31, 2024 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Schedule Of Allocations Are Reflected In Statements Of Operations [Line Items] | ||||||||||
| General and administrative expenses | $ 33,697 | $ 184,418 | $ 249,667 | |||||||
| OHB Pediatrics Ltd [Member] | ||||||||||
| Schedule Of Allocations Are Reflected In Statements Of Operations [Line Items] | ||||||||||
| General and administrative expenses | $ 15,000 | $ 2,813,000 | $ 710,000 | $ 1,297,000 | $ 15,000 | |||||
| Research and development costs | [1] | 34,000 | 6,000 | 23,000 | $ 0 | |||||
| Subsidiary of Common Parent [Member] | OHB Pediatrics Ltd [Member] | ||||||||||
| Schedule Of Allocations Are Reflected In Statements Of Operations [Line Items] | ||||||||||
| General and administrative expenses | 0 | 543,000 | 34,000 | 113,000 | ||||||
| Research and development costs | $ 0 | $ 955,000 | $ 301,000 | $ 708,000 | ||||||
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