Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 128,349	$ 125,591	$ 103,904
Water
Disaggregation of Revenue [Line Items]
Revenue	127,725	125,428	103,851
Emerging Technologies
Disaggregation of Revenue [Line Items]
Revenue	624	163	53
Megaproject
Disaggregation of Revenue [Line Items]
Revenue	83,665	81,888	75,391
Megaproject | Water
Disaggregation of Revenue [Line Items]
Revenue	83,665	81,755	75,338
Megaproject | Emerging Technologies
Disaggregation of Revenue [Line Items]
Revenue	0	133	53
Original equipment manufacturer
Disaggregation of Revenue [Line Items]
Revenue	25,995	28,858	17,604
Original equipment manufacturer | Water
Disaggregation of Revenue [Line Items]
Revenue	25,548	28,858	17,604
Original equipment manufacturer | Emerging Technologies
Disaggregation of Revenue [Line Items]
Revenue	447	0	0
Aftermarket
Disaggregation of Revenue [Line Items]
Revenue	18,689	14,845	10,909
Aftermarket | Water
Disaggregation of Revenue [Line Items]
Revenue	18,512	14,815	10,909
Aftermarket | Emerging Technologies
Disaggregation of Revenue [Line Items]
Revenue	177	30	0
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue	76,614	86,321	78,401
Middle East and Africa | Water
Disaggregation of Revenue [Line Items]
Revenue	76,437	86,227	78,348
Middle East and Africa | Emerging Technologies
Disaggregation of Revenue [Line Items]
Revenue	177	94	53
Asia
Disaggregation of Revenue [Line Items]
Revenue	30,500	24,777	18,639
Asia | Water
Disaggregation of Revenue [Line Items]
Revenue	30,500	24,777	18,639
Asia | Emerging Technologies
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Americas
Disaggregation of Revenue [Line Items]
Revenue	15,201	8,578	3,264
Americas | Water
Disaggregation of Revenue [Line Items]
Revenue	15,048	8,544	3,264
Americas | Emerging Technologies
Disaggregation of Revenue [Line Items]
Revenue	153	34	0
Europe
Disaggregation of Revenue [Line Items]
Revenue	6,034	5,915	3,600
Europe | Water
Disaggregation of Revenue [Line Items]
Revenue	5,740	5,880	3,600
Europe | Emerging Technologies
Disaggregation of Revenue [Line Items]
Revenue	$ 294	$ 35	$ 0