Operating Segments - Summary of Reconciliation of Information on Reportable Segments with Amounts Reported In Financial Statements (Detail) - EUR (€) |
6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
||||||
| Disclosure of operating segments [line items] | ||||||||
| Sales of Goods | € 42,862,000 | € 64,225,000 | ||||||
| Sales of Services | 10,756,000 | 11,706,000 | ||||||
| Changes in inventories and raw | [1] | (33,462,000) | (47,090,000) | |||||
| Employee benefits | [1] | (19,427,000) | (28,136,000) | |||||
| Other operating expenses | [1] | (15,028,000) | (21,153,000) | |||||
| Amortization and depreciation | [1] | (10,110,000) | (20,286,000) | |||||
| Impairment of assets | [1] | 0 | 2,449,000 | |||||
| Impairment of goodwill | 0 | (2,449,000) | ||||||
| Other income | 1,685,000 | (120,000) | ||||||
| Operating Loss | [1] | (22,724,000) | (38,405,000) | |||||
| Total Assets | 242,320,000 | [2] | 316,488,000 | € 239,517,000 | ||||
| Total Liabilities | 301,961,000 | [2] | 280,350,000 | € 270,978,000 | ||||
| Operating segments [member] | ||||||||
| Disclosure of operating segments [line items] | ||||||||
| Sales of Goods | 44,590,000 | 68,558,000 | ||||||
| Sales of Services | 10,823,000 | 11,868,000 | ||||||
| Changes in inventories and raw | (35,190,000) | (51,423,000) | ||||||
| Employee benefits | (19,427,000) | (28,136,000) | ||||||
| Other operating expenses | (15,095,000) | (21,315,000) | ||||||
| Amortization and depreciation | (10,110,000) | (20,286,000) | ||||||
| Impairment of goodwill | (2,449,000) | |||||||
| Other income | 1,685,000 | (120,000) | ||||||
| Operating Loss | (22,724,000) | (38,405,000) | ||||||
| Total Assets | 430,256,000 | 496,615,000 | ||||||
| Total Liabilities | 432,502,000 | 399,494,000 | ||||||
| Operating segments [member] | EMEA [member] | ||||||||
| Disclosure of operating segments [line items] | ||||||||
| Sales of Goods | 37,957,000 | 53,425,000 | ||||||
| Sales of Services | 4,618,000 | 3,324,000 | ||||||
| Changes in inventories and raw | (26,746,000) | (35,636,000) | ||||||
| Employee benefits | (16,694,000) | (23,611,000) | ||||||
| Other operating expenses | (12,848,000) | (17,111,000) | ||||||
| Amortization and depreciation | (8,947,000) | (19,049,000) | ||||||
| Impairment of goodwill | (2,449,000) | |||||||
| Other income | 1,443,000 | (122,000) | ||||||
| Operating Loss | (21,217,000) | (36,331,000) | ||||||
| Total Assets | 365,684,000 | 452,274,000 | ||||||
| Total Liabilities | 367,877,000 | 359,798,000 | ||||||
| Operating segments [member] | NORAM [member] | ||||||||
| Disclosure of operating segments [line items] | ||||||||
| Sales of Goods | 6,633,000 | 14,917,000 | ||||||
| Sales of Services | 6,155,000 | 8,382,000 | ||||||
| Changes in inventories and raw | (8,388,000) | (15,634,000) | ||||||
| Employee benefits | (2,620,000) | (4,394,000) | ||||||
| Other operating expenses | (2,206,000) | (4,114,000) | ||||||
| Amortization and depreciation | (1,162,000) | (1,237,000) | ||||||
| Other income | 242,000 | (47,000) | ||||||
| Operating Loss | (1,346,000) | (2,127,000) | ||||||
| Total Assets | 62,542,000 | 42,821,000 | ||||||
| Total Liabilities | 62,479,000 | 38,685,000 | ||||||
| Operating segments [member] | APAC [member] | ||||||||
| Disclosure of operating segments [line items] | ||||||||
| Sales of Goods | 216,000 | |||||||
| Sales of Services | 50,000 | 162,000 | ||||||
| Changes in inventories and raw | (56,000) | (153,000) | ||||||
| Employee benefits | (113,000) | (131,000) | ||||||
| Other operating expenses | (41,000) | (90,000) | ||||||
| Amortization and depreciation | (1,000) | |||||||
| Other income | 49,000 | |||||||
| Operating Loss | (161,000) | 53,000 | ||||||
| Total Assets | 2,030,000 | 1,520,000 | ||||||
| Total Liabilities | 2,146,000 | 1,011,000 | ||||||
| Consolidated adjustments and eliminations [member] | ||||||||
| Disclosure of operating segments [line items] | ||||||||
| Sales of Goods | (1,728,000) | (4,333,000) | ||||||
| Sales of Services | (67,000) | (162,000) | ||||||
| Changes in inventories and raw | 1,728,000 | 4,333,000 | ||||||
| Other operating expenses | 67,000 | 162,000 | ||||||
| Total Assets | (187,936,000) | (180,127,000) | ||||||
| Total Liabilities | € (130,541,000) | € (119,144,000) | ||||||
| ||||||||