Revenue - Schedule of Disaggregation of Revenue and Schedule of Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total	$ 203,829	$ 125,842	$ 531,182	$ 331,668
United States
Disaggregation of Revenue [Line Items]
Total	193,053	113,533	499,653	294,295
North America (outside of United States)
Disaggregation of Revenue [Line Items]
Total	4,187	5,824	14,468	16,127
Pacific Rim
Disaggregation of Revenue [Line Items]
Total	5,703	5,595	14,131	17,416
Europe
Disaggregation of Revenue [Line Items]
Total	882	890	2,704	3,781
Other
Disaggregation of Revenue [Line Items]
Total	4	0	226	49
Power Systems
Disaggregation of Revenue [Line Items]
Total	169,370	84,111	432,980	219,160
Industrial
Disaggregation of Revenue [Line Items]
Total	28,105	32,774	81,492	93,031
Transportation
Disaggregation of Revenue [Line Items]
Total	$ 6,354	$ 8,957	$ 16,710	$ 19,477