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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total	$ 125,842	$ 115,884	$ 331,668	$ 354,218
United States
Disaggregation of Revenue [Line Items]
Total	113,533	96,899	294,295	285,761
North America (outside of United States)
Disaggregation of Revenue [Line Items]
Total	5,824	4,484	16,127	16,605
Pacific Rim
Disaggregation of Revenue [Line Items]
Total	5,595	9,485	17,416	36,036
Europe
Disaggregation of Revenue [Line Items]
Total	890	4,273	3,781	11,238
Other
Disaggregation of Revenue [Line Items]
Total	0	743	49	4,578
Power Systems
Disaggregation of Revenue [Line Items]
Total	84,111	60,405	219,160	159,491
Industrial
Disaggregation of Revenue [Line Items]
Total	32,774	40,354	93,031	128,819
Transportation
Disaggregation of Revenue [Line Items]
Total	$ 8,957	$ 15,125	$ 19,477	$ 65,908