Leases - Schedule of the components of lease expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Lessee, Lease, Description [Line Items] | ||||||
| Operating lease cost | $ 2,700 | $ 2,700 | $ 5,500 | $ 5,500 | ||
| HMH Holding BV And Subsidiaries [Member] | ||||||
| Lessee, Lease, Description [Line Items] | ||||||
| Operating lease cost | $ 11,261 | $ 9,708 | ||||
| Sublease income | 0 | 544 | ||||
| Net lease cost | $ 11,261 | $ 9,164 | ||||