Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 11,996	$ 28,051	$ 21,702	$ 36,116
Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenue	0	212	198	213
Desalination
Disaggregation of Revenue [Line Items]
Total revenue	11,483	25,500	20,390	33,259
Wastewater
Disaggregation of Revenue [Line Items]
Total revenue	513	2,339	1,114	2,644
Original equipment manufacturer
Disaggregation of Revenue [Line Items]
Total revenue	5,178	8,357	11,766	12,358
Original equipment manufacturer \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenue	0	119	121	119
Original equipment manufacturer \| Desalination
Disaggregation of Revenue [Line Items]
Total revenue	4,665	5,926	10,531	9,739
Original equipment manufacturer \| Wastewater
Disaggregation of Revenue [Line Items]
Total revenue	513	2,312	1,114	2,500
Aftermarket
Disaggregation of Revenue [Line Items]
Total revenue	4,112	4,892	6,866	8,920
Aftermarket \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenue	0	93	77	94
Aftermarket \| Desalination
Disaggregation of Revenue [Line Items]
Total revenue	4,112	4,772	6,789	8,682
Aftermarket \| Wastewater
Disaggregation of Revenue [Line Items]
Total revenue	0	27	0	144
Megaproject
Disaggregation of Revenue [Line Items]
Total revenue	2,706	14,802	3,070	14,838
Megaproject \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Megaproject \| Desalination
Disaggregation of Revenue [Line Items]
Total revenue	2,706	14,802	3,070	14,838
Megaproject \| Wastewater
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Middle East
Disaggregation of Revenue [Line Items]
Total revenue	6,081	8,367	8,664	10,382
Middle East \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenue	0	92	77	93
Middle East \| Desalination
Disaggregation of Revenue [Line Items]
Total revenue	6,081	8,275	8,587	10,289
Middle East \| Wastewater
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Africa
Disaggregation of Revenue [Line Items]
Total revenue	475	1,049	671	1,915
Africa \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Africa \| Desalination
Disaggregation of Revenue [Line Items]
Total revenue	475	1,049	671	1,915
Africa \| Wastewater
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Total revenue	5,440	18,635	12,367	23,819
Other \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenue	0	120	121	120
Other \| Desalination
Disaggregation of Revenue [Line Items]
Total revenue	4,927	16,176	11,132	21,055
Other \| Wastewater
Disaggregation of Revenue [Line Items]
Total revenue	$ 513	$ 2,339	$ 1,114	$ 2,644