v3.26.1
PROPERTY, PLANT AND EQUIPMENT - Schedule of Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance $ 438,255 $ 501,876  
Additions (Note a) 65,527 134,110 $ 149,293
Depreciation expenses 77,022 82,495 84,785
Ending balance 419,965 438,255 501,876
Property, plant and equipment 419,965 438,255 501,876
Losses on disposal on property, plant and equipment 4,365 2,646 1,642
Write-downs of property, plant and equipment 1,732 31,963 1,387
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 892,688 885,416 755,838
Additions (Note a) 65,527 134,110 149,293
Disposals (62,489) (32,819) (22,565)
Reclassifications (7,633) 0 0
Exchange differences on translation 37,392 (94,019) 2,850
Ending balance 925,485 892,688 885,416
Property, plant and equipment 925,485 892,688 885,416
Accumulated depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (421,100) (382,153) (312,869)
Depreciation expenses 77,022 82,495 84,785
Disposals 34,467 17,320 17,865
Exchange differences on translation (17,929) 26,228 (2,364)
Ending balance (481,584) (421,100) (382,153)
Property, plant and equipment (481,584) (421,100) (382,153)
Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (33,333) (1,387)  
Disposals 10,095    
Impairment loss (Note c) 1,732 31,963 1,387
Exchange differences on translation 1,034 17  
Ending balance (23,936) (33,333) (1,387)
Property, plant and equipment (23,936) (33,333) (1,387)
Batteries      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 357,842 380,273  
Ending balance 360,853 357,842 380,273
Property, plant and equipment 360,853 357,842 380,273
Batteries | Other operating expense      
Reconciliation of changes in property, plant and equipment [abstract]      
Losses on disposals of property, plant and equipment 13,200 11,500 2,600
Batteries | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 605,737 602,886 530,113
Additions (Note a) 56,281 71,964 78,511
Disposals (30,147) (28,743) (9,365)
Reclassifications 0 0 204
Exchange differences on translation 26,640 (40,370) 3,423
Ending balance 658,511 605,737 602,886
Property, plant and equipment 658,511 605,737 602,886
Batteries | Accumulated depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (246,591) (222,613) (170,240)
Depreciation expenses 52,863 53,536 54,361
Disposals 13,725 14,001 5,031
Exchange differences on translation (10,687) 15,557 (3,043)
Ending balance (296,416) (246,591) (222,613)
Property, plant and equipment (296,416) (246,591) (222,613)
Batteries | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (1,304) 0  
Disposals 0    
Impairment loss (Note c) 0 1,304 0
Exchange differences on translation 62 0  
Ending balance (1,242) (1,304) 0
Property, plant and equipment (1,242) (1,304) 0
Undeployed battery packs and related battery cells | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 27,700 37,400  
Ending balance 20,000 27,700 37,400
Property, plant and equipment 20,000 27,700 37,400
Machinery equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 38,134 63,083  
Ending balance 27,061 38,134 63,083
Property, plant and equipment 27,061 38,134 63,083
Machinery equipment | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 138,297 138,831 131,541
Additions (Note a) 2,760 9,955 18,369
Disposals (13,607) (2,715) (10,436)
Reclassifications 0 557 190
Exchange differences on translation 6,993 (8,331) (833)
Ending balance 134,443 138,297 138,831
Property, plant and equipment 134,443 138,297 138,831
Machinery equipment | Accumulated depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (87,008) (74,394) (66,866)
Depreciation expenses 16,630 20,016 18,635
Disposals 3,277 2,295 10,398
Exchange differences on translation (3,552) 5,107 709
Ending balance (103,913) (87,008) (74,394)
Property, plant and equipment (103,913) (87,008) (74,394)
Machinery equipment | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (13,155) (1,354)  
Disposals 9,894    
Impairment loss (Note c) 0 11,816 1,354
Exchange differences on translation (208) 15  
Ending balance (3,469) (13,155) (1,354)
Property, plant and equipment (3,469) (13,155) (1,354)
Transportation equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 876 1,479  
Ending balance 540 876 1,479
Property, plant and equipment 540 876 1,479
Transportation equipment | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 11,329 11,560 11,292
Additions (Note a) 104 765 197
Disposals (178) (252) (219)
Reclassifications 0 0 281
Exchange differences on translation 475 (744) 9
Ending balance 11,730 11,329 11,560
Property, plant and equipment 11,730 11,329 11,560
Transportation equipment | Accumulated depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (10,353) (10,081) (7,641)
Depreciation expenses 477 1,169 2,560
Disposals 174 236 52
Exchange differences on translation (439) 661 68
Ending balance (11,095) (10,353) (10,081)
Property, plant and equipment (11,095) (10,353) (10,081)
Transportation equipment | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (100) 0  
Disposals 0    
Impairment loss (Note c) 0 100 0
Exchange differences on translation 5 0  
Ending balance (95) (100) 0
Property, plant and equipment (95) (100) 0
Tooling equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 4,060 3,394  
Ending balance 4,661 4,060 3,394
Property, plant and equipment 4,661 4,060 3,394
Tooling equipment | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 47,606 43,392 40,934
Additions (Note a) 4,084 4,871 3,699
Disposals (13,125) (194) (1,273)
Reclassifications 0 2,412 0
Exchange differences on translation 1,753 (2,875) 32
Ending balance 40,318 47,606 43,392
Property, plant and equipment 40,318 47,606 43,392
Tooling equipment | Accumulated depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (40,926) (39,998) (37,561)
Depreciation expenses 3,532 3,676 3,676
Disposals 12,999 142 1,268
Exchange differences on translation (1,694) 2,606 (29)
Ending balance (33,153) (40,926) (39,998)
Property, plant and equipment (33,153) (40,926) (39,998)
Tooling equipment | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (2,620) 0  
Disposals 0    
Impairment loss (Note c) 0 2,621 0
Exchange differences on translation 116 1  
Ending balance (2,504) (2,620) 0
Property, plant and equipment (2,504) (2,620) 0
Office equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 86 750  
Ending balance 176 86 750
Property, plant and equipment 176 86 750
Office equipment | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 2,862 3,266 2,796
Additions (Note a) 73 117 561
Disposals (818) (330) (96)
Reclassifications 0 0 0
Exchange differences on translation 127 (191) 5
Ending balance 2,244 2,862 3,266
Property, plant and equipment 2,244 2,862 3,266
Office equipment | Accumulated depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (2,553) (2,483) (2,306)
Depreciation expenses 206 359 270
Disposals 826 127 96
Exchange differences on translation (113) 162 (3)
Ending balance (2,046) (2,553) (2,483)
Property, plant and equipment (2,046) (2,553) (2,483)
Office equipment | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (223) (33)  
Disposals 201    
Impairment loss (Note c) 0 190 33
Exchange differences on translation 0 0  
Ending balance (22) (223) (33)
Property, plant and equipment (22) (223) (33)
Leasehold improvements      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 7,291 6,672  
Ending balance 6,080 7,291 6,672
Property, plant and equipment 6,080 7,291 6,672
Leasehold improvements | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 41,145 39,256 36,956
Additions (Note a) 1,381 1,984 2,524
Disposals (4,614) (539) (1,091)
Reclassifications 1,542 3,027 828
Exchange differences on translation 1,780 (2,583) 39
Ending balance 41,234 41,145 39,256
Property, plant and equipment 41,234 41,145 39,256
Leasehold improvements | Accumulated depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (33,669) (32,584) (28,255)
Depreciation expenses 3,314 3,739 5,283
Disposals 3,466 519 1,020
Exchange differences on translation (1,444) 2,135 (66)
Ending balance (34,961) (33,669) (32,584)
Property, plant and equipment (34,961) (33,669) (32,584)
Leasehold improvements | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (185) 0  
Disposals 0    
Impairment loss (Note c) 0 186 0
Exchange differences on translation (8) 1  
Ending balance (193) (185) 0
Property, plant and equipment (193) (185) 0
Construction in progress      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 29,966 46,225  
Ending balance 20,594 29,966 46,225
Property, plant and equipment 20,594 29,966 46,225
Construction in progress | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 45,712 46,225 2,206
Additions (Note a) 844 44,454 45,432
Disposals 0 (46) (85)
Reclassifications (9,175) (5,996) (1,503)
Exchange differences on translation (376) (38,925) 175
Ending balance 37,005 45,712 46,225
Property, plant and equipment 37,005 45,712 46,225
Construction in progress | Accumulated depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 0 0 0
Depreciation expenses 0 0 0
Disposals 0 0 0
Exchange differences on translation 0 0 0
Ending balance 0 0 0
Property, plant and equipment 0 0 0
Construction in progress | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (15,746) 0  
Disposals 0    
Impairment loss (Note c) 1,732 15,746 0
Exchange differences on translation 1,067 0  
Ending balance (16,411) (15,746) 0
Property, plant and equipment $ (16,411) $ (15,746) $ 0