Fair Value of Financial instruments - Schedule of Fair Value of Financial Instruments (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Level 1 | U.S Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net derivative liabilities	$ 51,993	$ 81,932
Level 1 | Global Water Treatment Trust Fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net derivative liabilities	12,054	0
Level 2 | U.S Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net derivative liabilities	0	0
Level 2 | Global Water Treatment Trust Fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net derivative liabilities	0	0
Level 3 | U.S Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net derivative liabilities	0	0
Level 3 | Global Water Treatment Trust Fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net derivative liabilities	$ 0	$ 0