v3.25.4
Property, plant and equipment (Details) - CHF (SFr)
SFr in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period SFr 4,198  
Property, plant and equipment at end of period SFr 5,229 SFr 4,198
Lease Facilities, Schlieren    
Disclosure of detailed information about property, plant and equipment [line items]    
Lease, extension term 2 years  
Property, plant and equipment | Lab equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period SFr 1,344  
Property, plant and equipment at end of period 1,405 1,344
Property, plant and equipment | Office equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 119  
Property, plant and equipment at end of period 65 119
Property, plant and equipment | IT hardware    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 206  
Property, plant and equipment at end of period 83 206
Property, plant and equipment | Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 128  
Property, plant and equipment at end of period 63 128
Right-of-use assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 2,401  
Property, plant and equipment at end of period 3,614 2,401
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 22,463 22,023
Additions 3,128 705
Disposals (488) (265)
Property, plant and equipment at end of period 25,103 22,463
Cost | Property, plant and equipment | Lab equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 10,002 9,740
Additions 662 356
Disposals (61) (94)
Property, plant and equipment at end of period 10,602 10,002
Cost | Property, plant and equipment | Office equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 764 723
Additions 0 145
Disposals 0 (104)
Property, plant and equipment at end of period 764 764
Cost | Property, plant and equipment | IT hardware    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 1,448 1,311
Additions 52 204
Disposals (427) (67)
Property, plant and equipment at end of period 1,074 1,448
Cost | Property, plant and equipment | Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 633 633
Additions 0 0
Disposals 0 0
Property, plant and equipment at end of period 633 633
Cost | Right-of-use assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 9,616 9,616
Additions 2,414 0
Disposals 0 0
Property, plant and equipment at end of period 12,030 9,616
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (18,265) (16,342)
Depreciation charge for the year (2,097) (2,188)
Disposals 488 265
Property, plant and equipment at end of period (19,874) (18,265)
Accumulated depreciation | Property, plant and equipment | Lab equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (8,658) (8,068)
Depreciation charge for the year (601) (684)
Disposals 61 94
Property, plant and equipment at end of period (9,198) (8,658)
Accumulated depreciation | Property, plant and equipment | Office equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (645) (700)
Depreciation charge for the year (54) (49)
Disposals 0 104
Property, plant and equipment at end of period (699) (645)
Accumulated depreciation | Property, plant and equipment | IT hardware    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (1,242) (1,125)
Depreciation charge for the year (176) (184)
Disposals 427 67
Property, plant and equipment at end of period (991) (1,242)
Accumulated depreciation | Property, plant and equipment | Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (504) (434)
Depreciation charge for the year (66) (70)
Disposals 0 0
Property, plant and equipment at end of period (570) (504)
Accumulated depreciation | Right-of-use assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (7,215) (6,015)
Depreciation charge for the year (1,201) (1,200)
Disposals 0 0
Property, plant and equipment at end of period SFr (8,416) SFr (7,215)