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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Cash flows from operating activities        
Net income (loss) $ (1,144,000) $ 15,646,000    
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Share-based compensation expense 22,800,000      
Provision for inventory write-down 2,000,000 3,000,000    
HMH Holding BV And Subsidiaries [Member]        
Cash flows from operating activities        
Net income (loss) (1,144,000) 15,646,000 $ 46,123,000 $ 51,956,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Depreciation and amortization 21,719,000 20,993,000 42,460,000 39,402,000
Share-based compensation expense 22,775,000 0    
Amortization of borrowing costs 727,000 975,000 1,789,000 1,858,000
Restructuring and other expenses 0 1,800,000 1,828,000 0
Deferred tax expense (benefit) (6,725,000) 846,000 2,390,000 7,033,000
Payment-in-kind interest 2,908,000 5,421,000 11,055,000 9,964,000
Provision for bad debt expense 468,000 480,000 11,136,000 1,965,000
Provision for inventory write-down 1,989,000 3,034,000 4,064,000 4,964,000
Loss on debt extinguishment     1,449,000 0
Changes in operating assets and liabilities        
Accounts receivable and related party accounts receivable (16,371,000) (6,569,000) 20,041,000 (16,614,000)
Contract assets 11,419,000 18,196,000 34,516,000 (3,267,000)
Inventories, net (956,000) 1,307,000 29,464,000 (47,232,000)
Other current receivables (5,083,000) 13,412,000 16,019,000 (5,733,000)
Prepaid and other current assets (1,636,000) (7,582,000) (6,245,000) 2,383,000
Accounts payable and accounts payable—related party 7,858,000 (38,875,000) (57,451,000) 2,535,000
Accrued expenses (12,427,000) (22,192,000) (41,513,000) 11,473,000
Contract liabilities 7,504,000 (295,000) (22,031,000) (16,409,000)
Other current and long-term liabilities (9,915,000) (8,957,000) (6,194,000) (12,092,000)
Other, net 2,046,000 (5,192,000) (590,000) 2,675,000
Net cash provided by (used in) operating activities 25,156,000 (7,552,000) 88,310,000 34,861,000
Cash flows from investing activities        
Purchase of property, plant and equipment (2,086,000) (4,840,000) (9,617,000) (16,096,000)
Purchase of property, plant and equipment     338,000 213,000
Purchase of intangible asset     (715) (192)
Development costs (5,896,000) (1,073,000) (6,649,000) (2,244,000)
Acquisition of business, net of cash (770,000) 0 (4,457,000) (19,624,000)
Net cash provided by (used in) investing activities (8,752,000) (5,913,000) (21,100,000) (37,943,000)
Cash flows from financing activities        
Issuance of common stock in initial public offering (IPO), net of underwriting discount 210,670,000 0    
Purchase of HMH B.V. voting shares from Principal Stockholders (39,480,000) 0    
Redemption under exchange agreement with Principal Stockholders (12,894,000) 0    
IPO issuance costs (10,380,000) 0    
Proceeds from issuance of long-term loans—bonds     200,000 0
Proceeds from issuance of long-term loans—revolving credit facilities 719,000 90,000,000 125,702,000 90,000,000
Repayment of long-term loans—bonds     (206,584) 0
Repayment of revolving credit facilities 0 (92,000,000) (140,000,000) (97,984,000)
Proceeds from sale to non-controlling interests     0 2,291,000
Repayment of long-term debt, net—related party (137,099,000) 0    
Purchase of treasury shares (4,888,000) 0    
Payment of borrowing costs     (3,378,000) (1,615,000)
Net cash provided by (used in) financing activities 6,648,000 (2,000,000) (24,260,000) (7,308,000)
Effect of foreign exchange rate on cash and cash equivalents 68,000 4,966,000 4,723,000 (3,222,000)
Net increase (decrease) in cash and cash equivalents 23,120,000 (10,499,000) 47,673,000 (13,612,000)
Cash and cash equivalents beginning of period 96,585,000 48,912,000 48,912,000 62,524,000
Cash and cash equivalents end of period 119,705,000 38,413,000 96,585,000 48,912,000
Supplemental cash flow information:        
Cash paid for income taxes, net 13,020,000 9,175,000 18,334,000 17,218,000
Cash paid for interest 9,195,000 13,700,000 28,024,000 23,284,000
Supplemental non-cash financing activities:        
Deferred IPO cost netted with IPO proceeds 15,809,000 0    
Settlement of long-term debt, net —related party and related party notes receivable $ 9,541,000 $ 0    
Contingent Consideration In Connection With Acquisition     $ 2,017,000 $ 3,700,000