v3.26.3
Debt - Short-term and Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Total debt, net $ 197,836 $ 340,083 $ 343,144
Current debt, net 1,473 715 14,397
Non-current debt, net 196,363 339,368 328,747
HMH Holding BV And Subsidiaries [Member]      
Debt Instrument [Line Items]      
Total debt, net   300,000  
Current debt, net   715 14,397
Nine Point Eight Seven Five Senior Secured Bonds due 2026 [Member]      
Debt Instrument [Line Items]      
Total debt, net   0 196,837
Seven Point Eight Seven Five Senior Secured Bonds due 2028 [Member]      
Debt Instrument [Line Items]      
Total debt, net 196,363 195,636  
Seven Point Eight Seven Five Senior Secured Bonds due 2028 [Member] | HMH Holding BV And Subsidiaries [Member]      
Debt Instrument [Line Items]      
Total debt, net   195,636 0
Shareholder Loans      
Debt Instrument [Line Items]      
Total debt, net 0 143,732 131,910
Line of Credit | Revolving Credit Facility      
Debt Instrument [Line Items]      
Total debt, net 0 0 14,397
Credit Line in China      
Debt Instrument [Line Items]      
Total debt, net $ 1,473 $ 715 $ 0