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Segment information - Financial information by business segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Revenue $ 12,498 $ 14,109 $ 19,821 $ 28,537
Cost of revenue 11,656 11,750 17,444 26,720
Gross profit 842 2,359 2,377 1,817
Research and development 1,574 3,460 2,867 7,809
Research and development 1,657      
General and administrative 4,106 5,720 6,778 12,915
Sales and marketing 290 962 733 2,083
Depreciation and amortization 106 98 214 456
Operating expenses 6,159 10,240 10,592 23,263
Add back: Depreciation & amortization 219 169 397 1,867
Segment EBITDA (8,087) (4,478) (12,829) (10,714)
Equity income (loss) (3,686) (1,102) (7,570) (1,102)
Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 24,518 18,168 48,640 32,596
Cost of revenue 25,602 15,651 47,674 30,621
Gross profit (1,084) 2,517 966 1,975
Research and development   4,581 7,757 8,930
Research and development 3,545      
General and administrative 3,112 2,174 6,223 4,130
Sales and marketing 348 551 791 1,280
Depreciation and amortization 919 312 1,705 471
Operating expenses 7,924 7,618 16,476 14,811
Add back: Depreciation & amortization 921 623 2,681 2,122
Segment EBITDA (8,087) (4,478) (12,829) (10,714)
Equity income (loss) 0 0 0 0
Operating Segments | High-Pressure Controls & Systems        
Segment Reporting Information [Line Items]        
Revenue 2,896 3,562 4,786 6,049
Cost of revenue 2,791 2,453 4,168 4,413
Gross profit 105 1,109 618 1,636
Research and development 1,635 1,408 2,734 2,951
General and administrative 386 303 705 496
Sales and marketing 23 130 150 362
Depreciation and amortization 59 43 115 85
Operating expenses 2,103 1,884 3,704 3,894
Add back: Depreciation & amortization 149 118 289 226
Segment EBITDA (1,849) (657) (2,797) (2,032)
Operating Segments | Heavy-Duty OEM        
Segment Reporting Information [Line Items]        
Revenue 9,602 10,547 15,035 22,488
Cost of revenue 8,865 9,297 13,276 22,307
Gross profit 737 1,250 1,759 181
Research and development 22 2,052 133 4,858
General and administrative 34 1,156 99 2,919
Sales and marketing 3 352 23 849
Depreciation and amortization 0 4 0 121
Operating expenses 59 3,564 255 8,747
Add back: Depreciation & amortization 0 0 0 1,391
Segment EBITDA 678 (2,314) 1,504 (7,175)
Operating Segments | Cespira        
Segment Reporting Information [Line Items]        
Revenue 12,020 4,059 28,819 4,059
Cost of revenue 13,946 3,901 30,230 3,901
Gross profit (1,926) 158 (1,411) 158
Research and development 1,888 1,121 4,890 1,121
General and administrative 2,692 715 5,419 715
Sales and marketing 322 69 618 69
Depreciation and amortization 860 265 1,590 265
Operating expenses 5,762 2,170 12,517 2,170
Add back: Depreciation & amortization 772 505 2,392 505
Segment EBITDA (6,916) (1,507) (11,536) (1,507)
Consolidation, Eliminations        
Segment Reporting Information [Line Items]        
Revenue (12,020) (4,059) (28,819) (4,059)
Cost of revenue (13,946) (3,901) (30,230) (3,901)
Gross profit 1,926 (158) 1,411 (158)
Research and development (1,888) (1,121) (4,890) (1,121)
General and administrative (2,692) (715) (5,419) (715)
Sales and marketing (322) (69) (618) (69)
Depreciation and amortization (860) (265) (1,590) (265)
Operating expenses (5,762) (2,170) (12,517) (2,170)
Equity income (loss) 0 0 0 0
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Cost of revenue 0 0 0 0
Gross profit 0 0 0 0
Research and development 0 0 0 0
General and administrative 3,686 4,261 5,974 9,500
Sales and marketing 264 480 560 872
Depreciation and amortization 47 51 99 250
Operating expenses 3,997 4,792 6,633 10,622
Equity income (loss) $ (3,686) $ (1,102) $ (7,570) $ (1,102)