Reportable Segments and Geographic Information - Revenue by Major Customer by Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue, Major Customer [Line Items]
Revenue	$ 83,357	$ 84,047	$ 249,220	$ 219,949
RNG Fuel
Revenue, Major Customer [Line Items]
Revenue	22,921	25,864	75,650	63,036
Fuel Station Services
Revenue, Major Customer [Line Items]
Revenue	51,722	45,395	149,426	121,794
Renewable Power
Revenue, Major Customer [Line Items]
Revenue	8,714	12,788	24,144	35,119
Customer A
Revenue, Major Customer [Line Items]
Revenue	$ 29,045	$ 35,213	$ 94,987	$ 87,188
Customer A | Revenue Benchmark | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of total revenue	34.00%	42.00%	38.00%	40.00%
Customer A | RNG Fuel
Revenue, Major Customer [Line Items]
Revenue	$ 17,825	$ 22,798	$ 55,658	$ 54,174
Customer A | RNG Fuel | Revenue Benchmark | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of total revenue	21.00%	27.00%	22.00%	25.00%
Customer A | Fuel Station Services
Revenue, Major Customer [Line Items]
Revenue	$ 9,198	$ 10,616	$ 34,653	$ 27,885
Customer A | Fuel Station Services | Revenue Benchmark | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of total revenue	11.00%	13.00%	14.00%	13.00%
Customer A | Renewable Power
Revenue, Major Customer [Line Items]
Revenue	$ 2,022	$ 1,799	$ 4,676	$ 5,129
Customer A | Renewable Power | Revenue Benchmark | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of total revenue	2.00%	2.00%	2.00%	2.00%
Customer B | Fuel Station Services
Revenue, Major Customer [Line Items]
Revenue		$ 11,503		$ 31,880
Customer B | Fuel Station Services | Revenue Benchmark | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of total revenue		14.00%		14.00%