v3.26.3
REPORTABLE SEGMENTS AND GEOGRAPHIC INFORMATION - Revenue by Major Customer by Reporting Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 79,491 $ 83,357 $ 236,265 $ 249,220
Revenue from contracts with customers 73,171 77,889 220,282 238,301
Revenue from lease arrangements 6,320 5,468 15,983 10,919
Customer A        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 33,495 $ 29,045 $ 100,036 $ 94,987
Customer A | Customer Concentration Risk | Revenue Benchmark        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Concentration risk, percentage 42.00% 34.00% 42.00% 38.00%
RNG fuel        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues [1],[2] $ 22,489 $ 22,921 $ 67,948 $ 75,650
RNG fuel | Customer A        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 17,703 $ 17,825 $ 53,158 $ 55,658
RNG fuel | Customer A | Customer Concentration Risk | Revenue Benchmark        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Concentration risk, percentage 22.00% 21.00% 22.00% 22.00%
Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues [3],[4] $ 49,740 $ 51,722 $ 147,370 $ 149,426
Fuel Station Services | Customer A        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 14,643 $ 9,198 $ 44,039 $ 34,653
Fuel Station Services | Customer A | Customer Concentration Risk | Revenue Benchmark        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Concentration risk, percentage 18.00% 11.00% 19.00% 14.00%
Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues [5],[6] $ 7,262 $ 8,714 $ 20,947 $ 24,144
Renewable Power | Customer A        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 1,149 $ 2,022 $ 2,839 $ 4,676
Renewable Power | Customer A | Customer Concentration Risk | Revenue Benchmark        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Concentration risk, percentage 1.00% 2.00% 1.00% 2.00%
Environmental attributes | RNG fuel        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 18,868 $ 19,061 $ 57,522 $ 64,832
Environmental attributes | Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 791 2,416 2,662 6,004
Brown gas sales and other | RNG fuel        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 3,621 3,860 10,426 10,818
OPAL owned stations | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 7,790 4,778 18,843 15,600
Environmental Attributes And RNG MarketingEnvironmental attributes and RNG marketing | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 24,152 20,379 76,335 71,679
Third party station service and maintenance | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 7,334 7,122 21,259 20,726
Construction | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 4,412 14,203 15,640 31,377
Lease revenues | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 6,052 5,240 15,293 10,044
Lease revenues | Fuel Station Services | OCI Fuels B.V. ("OCI")        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 1,915 0 4,161 0
Lease revenues | Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 268 228 690 875
Electricity sales | Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 5,419 5,137 16,126 14,716
Other | Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 784 $ 933 $ 1,469 $ 2,549
[1]
Includes revenues from related parties of $16,917 and $55,658 for the nine months ended September 30, 2026 and 2025, respectively.
[2] Includes revenues from related parties of $0 and $17,825 for the three months ended September 30, 2026 and 2025, respectively.
[3]
Includes revenues from related parties of $19,022 and $40,921 for the nine months ended September 30, 2026 and 2025, respectively.
[4] Includes revenues from related parties of $2,664 and $11,492 for the three months ended September 30, 2026 and 2025, respectively
[5]
Includes revenues from related parties of $872 and $4,676 for the nine months ended September 30, 2026 and 2025, respectively.
[6] Includes revenues from related parties of $0 and $2,022 for the three months ended September 30, 2026 and 2025, respectively.