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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