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Property, plant and equipment - Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | $ 116,325 |
Impairment |  | $ (967)
Property, plant and equipment including right-of-use assets at end of period | 30,424 | 116,325
Cost |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | 167,933 | 127,999
Property, plant and equipment including right-of-use assets at beginning of period | 166,997 |
Additions | 25,342 | 41,214
Disposals | (376) | (111)
Reclass | (990) | (1,171)
Effect of movements in exchange rates | (6) | (2)
Property, plant and equipment including right-of-use assets at end of period |  | 167,933
Property, plant and equipment including right-of-use assets at end of period | 190,967 | 166,997
Cost | Building |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | 936 | 0
Property, plant and equipment including right-of-use assets at beginning of period | 0 |
Additions | 852 | 936
Disposals | 0 | 0
Reclass | (852) | 0
Effect of movements in exchange rates | 0 | 0
Property, plant and equipment including right-of-use assets at end of period |  | 936
Property, plant and equipment including right-of-use assets at end of period | 0 | 0
Cost | Computer equipment |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | 7,356 | 6,741
Additions | 178 | 745
Disposals | 0 | 0
Reclass | 0 | (130)
Effect of movements in exchange rates | 0 | 0
Property, plant and equipment including right-of-use assets at end of period | 7,534 | 7,356
Cost | Furniture and fixtures |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | 2,764 | 2,406
Additions | 10 | 328
Disposals | (376) | 0
Reclass | 3,101 | 0
Effect of movements in exchange rates | (3) | (30)
Property, plant and equipment including right-of-use assets at end of period | 5,496 | 2,764
Cost | Leasehold improvements |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | 10,780 | 9,650
Additions | 1,227 | 1,103
Disposals | 0 | 0
Reclass | 2,335 | 0
Effect of movements in exchange rates | 7 | (27)
Property, plant and equipment including right-of-use assets at end of period | 14,349 | 10,780
Cost | Production and test equipment |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | 146,097 | 109,202
Additions | 23,075 | 38,102
Disposals | 0 | (111)
Reclass | (5,574) | (1,041)
Effect of movements in exchange rates | (10) | 55
Property, plant and equipment including right-of-use assets at end of period | 163,588 | 146,097
Accumulated depreciation |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | (65,727) | (57,655)
Property, plant and equipment including right-of-use assets at beginning of period | 64,791 |
Depreciation |  | 8,299
Depreciation | 7,264 |
Disposals |  | 23
Disposals | (113) |
Impairment | 111,020 | 967
Reclass | (990) | (1,171)
Effect of movements in exchange rates | 5 | 0
Property, plant and equipment including right-of-use assets at end of period |  | (65,727)
Property, plant and equipment including right-of-use assets at end of period | 181,967 | 64,791
Accumulated depreciation | Building |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | (936) | 0
Property, plant and equipment including right-of-use assets at beginning of period | 0 |
Depreciation |  | 0
Depreciation | 0 |
Disposals |  | 0
Disposals | 0 |
Impairment | 852 | 936
Reclass | (852) | 0
Effect of movements in exchange rates |  | 0
Property, plant and equipment including right-of-use assets at end of period |  | (936)
Property, plant and equipment including right-of-use assets at end of period | 0 | 0
Accumulated depreciation | Computer equipment |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | (5,951) | (5,534)
Depreciation |  | 491
Depreciation | 455 |
Disposals |  | 0
Disposals | 0 |
Impairment | 585 | 0
Reclass | 0 | (73)
Effect of movements in exchange rates | 2 | 1
Property, plant and equipment including right-of-use assets at end of period | (6,989) | (5,951)
Accumulated depreciation | Furniture and fixtures |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | (1,328) | (1,083)
Depreciation |  | 245
Depreciation | 474 |
Disposals |  | 0
Disposals | (200) |
Impairment | 458 | 0
Reclass | 140 | (12)
Effect of movements in exchange rates | 4 | (12)
Property, plant and equipment including right-of-use assets at end of period | (2,196) | (1,328)
Accumulated depreciation | Leasehold improvements |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | (8,535) | (8,100)
Depreciation |  | 431
Depreciation | 1,171 |
Disposals |  | 0
Disposals | 87 |
Impairment | 850 | 0
Reclass | 109 | 4
Effect of movements in exchange rates | 3 | 0
Property, plant and equipment including right-of-use assets at end of period | (10,749) | (8,535)
Accumulated depreciation | Production and test equipment |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | (48,977) | (42,938)
Depreciation |  | 7,132
Depreciation | 6,714 |
Disposals |  | 23
Disposals | 0 |
Impairment | 13,199 | 31
Reclass | (387) | (1,090)
Effect of movements in exchange rates | (4) | 11
Property, plant and equipment including right-of-use assets at end of period | (68,507) | (48,977)
Accumulated depreciation | Impairment reserve |  |
Property, Plant and Equipment [Roll Forward] |  |
Property, plant and equipment including right-of-use assets at beginning of period | 0 |
Depreciation | (1,550) |
Disposals | 0 |
Impairment | 95,076 |
Reclass | 0 |
Effect of movements in exchange rates | 0 |
Property, plant and equipment including right-of-use assets at end of period | $ (93,526) | $ 0

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