v3.26.1
Property, plant and equipment
 12 Months Ended
Dec. 31, 2025
Property, plant and equipment [abstract]  
Property, plant and equipment Property, plant and equipment
Property, plant and equipment include:
Leasehold
improvements		Plant and
equipment		IT and office
equipment		Right of useTotal
 (in thousands)
Cost:
At January 1, 2023$1,417 $32,380 $4,387 7,079 $45,263 
Additions75 1,812 220 767 2,874 
Disposals— (2)(3)(414)(419)
Exchange difference10 107 16 — 133 
At December 31, 20231,502 34,297 4,620 7,432 47,851 
Additions— 772 70 462 1,304 
Disposals(77)(727)(275)(705)(1,784)
Exchange difference(4)(22)(19)— (45)
At December 31, 20241,421 34,320 4,396 7,189 47,326 
Additions20 304 162 1,255 1,741 
Acquisition of ACP Advanced Circuit Pursuit AG— 951 — — 951 
Disposals(38)(88)(459)(302)(887)
Exchange difference30 235 160 — 425 
At December 31, 2025$1,433 $35,722 $4,259 $8,142 $49,556 
Depreciation and impairment:
At January 1, 20231,333 26,971 3,993 4,477 36,774 
Depreciation charge for the year41 2,421 198 1,223 3,883 
Impairment— 711 — — 711 
Disposals— (2)— (414)(416)
Exchange difference7 69 8 — 84 
At December 31, 20231,381 30,170 4,199 5,286 41,036 
Depreciation charge for the year21 1,656 225 1,201 3,103 
Impairment— 251 — — 251 
Disposals(23)(606)(224)(483)(1,336)
Exchange difference(4)(15)(17)— (36)
At December 31, 20241,375 31,456 4,183 6,004 43,018 
Depreciation charge for the year14 1,571 192 980 2,757 
Disposals(37)(88)(448)(304)(877)
Exchange difference208 262 (112)— 358 
At December 31, 2025$1,422 $33,111 $4,044 6,680 $45,257 
Net book value:
At January 1, 2023$84 $5,409 $394 2,602 $8,489 
At December 31, 2023121 4,127 421 2,146 6,815 
At December 31, 202446 2,864 213 1,185 4,308 
At December 31, 2025$11 $2,611 $215 1,462 $4,299 
Right-of-use assets as of December 31, 2025 relate to real-estate leases ($7,921,000, gross, $6,969,000, gross as of December 31, 2024 and $7,212,000, gross as of December 31, 2023) as well as IT and office equipment leases ($220,000, gross, $220,000, gross as of December 31, 2024 and 2023).
Increases related to the acquisition of ACP Advanced Circuit Pursuit AG represent the fair value of fixed assets acquired as part of the integration of this company into the Company’s scope of consolidation. Accumulated depreciation represents the depreciation recognized on these assets at the acquisition date.
In the year ended December 31, 2024, the Company recognized an impairment loss of $251,000 related to the decision to discontinue the development of the 5G broadband platform. In the year ended December 31, 2023, the Company recognized an impairment loss of $707,000 related to a production equipment with a carrying amount is not recoverable.

Following the sale and license back of the Monarch 2 and Calliope 2 intellectual property as described in Note 4, the Company reassessed the remaining useful lives of equipment related to these two products, extending the useful lives until the end of 2029 to be consistent with the estimated useful life of the license back.