v3.26.1
Segment information - Financial information by business segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Revenue $ 2,717 $ 12,498 $ 5,002 $ 19,821
Cost of revenue 2,584 11,656 4,353 17,444
Gross profit 133 842 649 2,377
Research and development 1,211 1,574 2,434 2,867
General and administrative 4,174 4,106 7,008 6,778
Sales and marketing 224 290 431 733
Depreciation and amortization 45 106 155 214
Operating expenses, including depreciation and amortization 5,654 6,076 10,028 10,592
Add back: Depreciation and amortization 255 219 467 397
Segment EBITDA (2,010) (7,981) (5,339) (12,820)
Equity loss (1,283) (3,686) (2,664) (7,570)
Operating Segments        
Segment Reporting [Line Items]        
Revenue 29,788 24,518 54,322 48,640
Cost of revenue 25,841 25,602 48,283 47,674
Gross profit 3,947 (1,084) 6,039 966
Research and development 1,972 3,462 4,400 7,757
General and administrative 3,530 3,112 6,344 6,223
Sales and marketing 752 348 1,108 791
Depreciation and amortization 910 919 1,869 1,705
Operating expenses, including depreciation and amortization 7,164 7,841 13,721 16,476
Add back: Depreciation and amortization 1,207 944 2,343 2,690
Segment EBITDA (2,010) (7,981) (5,339) (12,820)
Equity loss 0 0 0 0
Operating Segments | High-Pressure Controls        
Segment Reporting [Line Items]        
Revenue 2,717 2,896 5,002 4,786
Cost of revenue 2,584 2,791 4,353 4,168
Gross profit 133 105 649 618
Research and development 790 1,552 1,738 2,734
General and administrative 561 386 1,112 705
Sales and marketing 131 23 226 150
Depreciation and amortization 11 59 96 115
Operating expenses, including depreciation and amortization 1,493 2,020 3,172 3,704
Add back: Depreciation and amortization 221 172 408 298
Segment EBITDA (1,139) (1,743) (2,115) (2,788)
Operating Segments | Heavy-Duty OEM        
Segment Reporting [Line Items]        
Revenue   9,602   15,035
Cost of revenue   8,865   13,276
Gross profit   737   1,759
Research and development   22   133
General and administrative   34   99
Sales and marketing   3   23
Depreciation and amortization   0   0
Operating expenses, including depreciation and amortization   59   255
Add back: Depreciation and amortization   0   0
Segment EBITDA   678   1,504
Consolidation, Eliminations        
Segment Reporting [Line Items]        
Revenue (27,071) (12,020) (49,320) (28,819)
Cost of revenue (23,257) (13,946) (43,930) (30,230)
Gross profit (3,814) 1,926 (5,390) 1,411
Research and development (1,182) (1,888) (2,662) (4,890)
General and administrative (2,969) (2,692) (5,232) (5,419)
Sales and marketing (621) (322) (882) (618)
Depreciation and amortization (899) (860) (1,773) (1,590)
Operating expenses, including depreciation and amortization (5,671) (5,762) (10,549) (12,517)
Add back: Depreciation and amortization (986) (772) (1,935) (2,392)
Segment EBITDA 871 6,916 3,224 11,536
Equity loss 0 0
Corporate        
Segment Reporting [Line Items]        
Revenue 0 0 0 0
Cost of revenue 0 0 0 0
Gross profit 0 0 0 0
Research and development 421 0 696 0
General and administrative 3,613 3,686 5,896 5,974
Sales and marketing 93 264 205 560
Depreciation and amortization 34 47 59 99
Operating expenses, including depreciation and amortization 4,161 3,997 6,856 6,633
Equity loss $ (1,283) $ (3,686) $ (2,664) $ (7,570)