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Property, plant and equipment - Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period $ 82,361  
Impairment (967)  
Property, plant and equipment including right-of-use assets at end of period 116,325 $ 82,361
Cost    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 127,999 95,860
Additions 41,214 33,932
Disposals (111)  
Impairment   (7)
Transfers (1,171) (1,792)
Effect of movements in exchange rates 2 (6)
Property, plant and equipment including right-of-use assets at end of period 167,933 127,999
Accumulated amortization    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period (57,655) (52,005)
Disposals 23  
Depreciation 8,299 7,434
Impairment 967  
Transfers (1,171) (1,792)
Effect of movements in exchange rates 0 (8)
Property, plant and equipment including right-of-use assets at end of period (65,727) (57,655)
Building | Cost    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 0  
Additions 936  
Disposals 0  
Transfers 0  
Effect of movements in exchange rates 0  
Property, plant and equipment including right-of-use assets at end of period 936 0
Building | Accumulated amortization    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 0  
Disposals 0  
Depreciation 0  
Impairment 936  
Transfers 0  
Effect of movements in exchange rates 0  
Property, plant and equipment including right-of-use assets at end of period (936) 0
Computer equipment    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 1,207  
Property, plant and equipment including right-of-use assets at end of period 1,405 1,207
Computer equipment | Cost    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 6,741 6,852
Additions 745 181
Disposals 0  
Impairment   0
Transfers (130) (290)
Effect of movements in exchange rates 0 2
Property, plant and equipment including right-of-use assets at end of period 7,356 6,741
Computer equipment | Accumulated amortization    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period (5,534) (5,253)
Disposals 0  
Depreciation 491 574
Impairment 0  
Transfers (73) (290)
Effect of movements in exchange rates 1 3
Property, plant and equipment including right-of-use assets at end of period (5,951) (5,534)
Furniture and fixtures    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 1,323  
Property, plant and equipment including right-of-use assets at end of period 1,436 1,323
Furniture and fixtures | Cost    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 2,406 1,914
Additions 328 700
Disposals 0  
Impairment   0
Transfers 0 (208)
Effect of movements in exchange rates 30 0
Property, plant and equipment including right-of-use assets at end of period 2,764 2,406
Furniture and fixtures | Accumulated amortization    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period (1,083) (1,152)
Disposals 0  
Depreciation 245 139
Impairment 0  
Transfers (12) (208)
Effect of movements in exchange rates (12) 0
Property, plant and equipment including right-of-use assets at end of period (1,328) (1,083)
Leasehold improvements    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 1,550  
Property, plant and equipment including right-of-use assets at end of period 2,245 1,550
Leasehold improvements | Cost    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 9,650 9,450
Additions 1,103 388
Disposals 0  
Impairment   0
Transfers 0 (185)
Effect of movements in exchange rates 27 3
Property, plant and equipment including right-of-use assets at end of period 10,780 9,650
Leasehold improvements | Accumulated amortization    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period (8,100) (7,932)
Disposals 0  
Depreciation 431 353
Impairment 0  
Transfers 4 (185)
Effect of movements in exchange rates 0 0
Property, plant and equipment including right-of-use assets at end of period (8,535) (8,100)
Production and test equipment    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 66,264  
Property, plant and equipment including right-of-use assets at end of period 97,120 66,264
Production and test equipment | Cost    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period 109,202 77,644
Additions 38,102 32,663
Disposals (111)  
Impairment   (7)
Transfers (1,041) (1,109)
Effect of movements in exchange rates (55) (11)
Property, plant and equipment including right-of-use assets at end of period 146,097 109,202
Production and test equipment | Accumulated amortization    
Property, Plant and Equipment [Roll Forward]    
Property, plant and equipment including right-of-use assets at beginning of period (42,938) (37,668)
Disposals 23  
Depreciation 7,132 6,368
Impairment 31  
Transfers (1,090) (1,109)
Effect of movements in exchange rates 11 (11)
Property, plant and equipment including right-of-use assets at end of period $ (48,977) $ (42,938)