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Segment information - Financial information by business segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenue $ 1,617 $ 4,877 $ 21,438 $ 33,414
Cost of revenue 1,145 4,214 18,589 30,934
Gross profit 472 663 2,849 2,480
Research and development 2,319 628 5,186 8,437
Research and development 2,319      
General and administrative 4,130 3,416 10,908 16,331
Sales and marketing 305 367 1,038 2,450
Depreciation and amortization 146 103 360 559
Operating expenses 6,900 4,514 17,492 27,777
Add back: Depreciation and amortization 172 225 569 2,092
Segment EBITDA (6,597) (4,381) (18,527) (15,095)
Equity loss (3,197) (3,002) (10,767) (4,104)
Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 20,945 21,086 69,585 53,682
Cost of revenue 21,509 20,588 69,183 51,209
Gross profit (564) 498 402 2,473
Research and development   2,458 11,211 11,388
Research and development 3,454      
General and administrative 2,928 2,290 9,151 6,420
Sales and marketing 463 415 1,254 1,694
Depreciation and amortization 941 975 2,646 1,447
Operating expenses 7,786 6,138 24,262 20,949
Add back: Depreciation and amortization 1,753 1,259 5,333 3,381
Segment EBITDA (6,597) (4,381) (18,527) (15,095)
Equity loss 0 0 0 0
Operating Segments | High-Pressure Controls & Systems        
Segment Reporting Information [Line Items]        
Revenue 1,606 1,764 6,392 7,813
Cost of revenue 1,145 1,352 5,313 5,766
Gross profit 461 412 1,079 2,047
Research and development 2,293 1,257 5,027 4,208
General and administrative 484 292 1,189 788
Sales and marketing 103 44 253 404
Depreciation and amortization 108 27 223 112
Operating expenses 2,988 1,620 6,692 5,512
Add back: Depreciation and amortization 143 145 432 372
Segment EBITDA (2,384) (1,063) (5,181) (3,093)
Operating Segments | Heavy-Duty OEM        
Segment Reporting Information [Line Items]        
Revenue 11 3,113 15,046 25,601
Cost of revenue 0 2,862 13,276 25,168
Gross profit 11 251 1,770 433
Research and development 26 (629) 159 4,229
General and administrative 34 55 133 2,974
Sales and marketing 3 36 26 886
Depreciation and amortization 0 4 0 126
Operating expenses 63 (534) 318 8,215
Add back: Depreciation and amortization 0 8 0 1,399
Segment EBITDA (52) 793 1,452 (6,383)
Operating Segments | Cespira        
Segment Reporting Information [Line Items]        
Revenue 19,328 16,209 48,147 20,268
Cost of revenue 20,364 16,374 50,594 20,275
Gross profit (1,036) (165) (2,447) (7)
Research and development 1,135 1,830 6,025 2,951
General and administrative 2,410 1,943 7,829 2,658
Sales and marketing 357 335 975 404
Depreciation and amortization 833 944 2,423 1,209
Operating expenses 4,735 5,052 17,252 7,222
Add back: Depreciation and amortization 1,610 1,106 4,901 1,610
Segment EBITDA (4,161) (4,111) (14,798) (5,619)
Consolidation, Eliminations        
Segment Reporting Information [Line Items]        
Revenue (19,328) (16,209) (48,147) (20,268)
Cost of revenue (20,364) (16,374) (50,594) (20,275)
Gross profit 1,036 165 2,447 7
Research and development (1,135) (1,830) (6,025) (2,951)
General and administrative (2,410) (1,943) (7,829) (2,658)
Sales and marketing (357) (335) (975) (404)
Depreciation and amortization (833) (944) (2,423) (1,209)
Operating expenses (4,735) (5,052) (17,252) (7,222)
Equity 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 3,612 3,069 9,586 12,569
Sales and marketing 199 287 759 1,160
Depreciation and amortization 38 72 137 321
Operating expenses 3,849 3,428 10,482 14,050
Equity loss $ (3,197) $ (3,002) $ (10,767) $ (4,104)