v3.26.3
REPORTABLE SEGMENTS AND GEOGRAPHIC INFORMATION - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]                      
Total revenues $ 79,491     $ 83,357         $ 236,265 $ 249,220  
Cost of sales 51,723     60,258         159,088 182,056  
Loss from equity method investments (1,293) $ 278 $ 1,438 (839) $ (2,164) $ 520 $ 1,716 $ (1,644) 423 (2,483)  
Interest and financing expense, net 8,185     6,898         20,615 19,330  
Project development and startup costs 2,744     2,543         7,860 12,101  
Impairment loss 14     0         4,156 0  
Depreciation, amortization, and accretion 5,040 4,823 5,269 5,223 5,093   10,093 11,035 15,133 16,258  
Other corporate expenses 7,304     9,563         25,992 29,752  
Stock-based compensation 2,271     902         6,386 4,858  
Other segment items 1,843     722         3,035 1,137  
Net income (loss) before provision for income taxes 1,660 (3,301) (4,782) (1,913) (5,726) (6,152)   (11,878) (6,423) (13,789)  
Provision for income taxes 0 (183)   0         (183) 0  
Net income (loss) 1,660 $ (3,484) $ (4,782) (1,913) $ (5,726) $ (6,152) $ (8,266) $ (11,878) (6,606) (13,789)  
Investments in other entities [1] 213,400               213,400   $ 206,723
Segment assets [1] 1,024,614               1,024,614   908,328
Cash paid for purchases of property, plant and equipment                 70,979 60,890  
Intersegment Eliminations                      
Segment Reporting [Line Items]                      
Total revenues 549     5,533         15,440 15,094  
Operating Segments                      
Segment Reporting [Line Items]                      
Total revenues 79,491     83,357         236,265 249,220  
Cost of sales 51,723     60,258         159,088 182,056  
Loss from equity method investments (1,293)     (839)         423 (2,483)  
Interest and financing expense, net 8,185     6,898         20,615 19,330  
Project development and startup costs 2,744     2,543         7,860 12,101  
Impairment loss 14               4,156    
Depreciation, amortization, and accretion 5,040     5,223         15,133 16,258  
Other corporate expenses 0     0         0 0  
Stock-based compensation 0     0         0 0  
Other segment items 1,843     722         3,035 1,137  
Net income (loss) before provision for income taxes 11,235     8,552         25,955 20,821  
Investments in other entities 213,400               213,400   206,723
Segment assets 978,295               978,295   850,440
Cash paid for purchases of property, plant and equipment                 70,979 60,890  
Operating Segments | Intersubsegment Eliminations                      
Segment Reporting [Line Items]                      
Total revenues 80,040     88,890         251,705 264,314  
Corporate                      
Segment Reporting [Line Items]                      
Total revenues 0     0         0 0  
Cost of sales 0     0         0 0  
Loss from equity method investments 0     0         0 0  
Interest and financing expense, net 0     0         0 0  
Project development and startup costs 0     0         0 0  
Impairment loss 0               0    
Depreciation, amortization, and accretion 0     0         0 0  
Other corporate expenses 7,304     9,563         25,992 29,752  
Stock-based compensation 2,271     902         6,386 4,858  
Other segment items 0     0         0 0  
Investments in other entities 0               0   0
Segment assets 46,319               46,319   57,888
Cash paid for purchases of property, plant and equipment                 0 0  
Corporate and Eliminations                      
Segment Reporting [Line Items]                      
Total revenues 0     0         0 0  
Net income (loss) before provision for income taxes (9,575)     (10,465)         (32,378) (34,610)  
RNG fuel                      
Segment Reporting [Line Items]                      
Total revenues [2],[3] 22,489     22,921         67,948 75,650  
RNG fuel | Intersegment Eliminations                      
Segment Reporting [Line Items]                      
Total revenues 189     139         473 415  
RNG fuel | Operating Segments                      
Segment Reporting [Line Items]                      
Total revenues 22,489     22,921         67,948 75,650  
Cost of sales 9,138     13,466         27,496 41,216  
Loss from equity method investments (1,293)     (839)         423 (2,483)  
Interest and financing expense, net 8,279     6,929         22,210 19,333  
Project development and startup costs 2,744     2,543         7,860 12,101  
Impairment loss 0               0    
Depreciation, amortization, and accretion 2,782     2,688         8,331 8,471  
Other corporate expenses 0     0         0 0  
Stock-based compensation 0     0         0 0  
Other segment items 325     210         1,243 665  
Net income (loss) before provision for income taxes 514     (2,076)         385 (3,653)  
Investments in other entities 213,400               213,400   206,723
Segment assets 742,013               742,013   624,847
Cash paid for purchases of property, plant and equipment                 61,720 44,259  
RNG fuel | Operating Segments | Intersubsegment Eliminations                      
Segment Reporting [Line Items]                      
Total revenues 22,678     23,060         68,421 76,065  
Fuel Station Services                      
Segment Reporting [Line Items]                      
Total revenues [4],[5] 49,740     51,722         147,370 149,426  
Fuel Station Services | Intersegment Eliminations                      
Segment Reporting [Line Items]                      
Total revenues 360     5,394         14,967 14,679  
Fuel Station Services | Operating Segments                      
Segment Reporting [Line Items]                      
Total revenues 49,740     51,722         147,370 149,426  
Cost of sales 35,289     40,230         111,041 118,683  
Loss from equity method investments 0     0         0 0  
Interest and financing expense, net (78)     (11)         (1,537) 45  
Project development and startup costs 0     0         0 0  
Impairment loss 14               561    
Depreciation, amortization, and accretion 1,546     1,573         4,710 4,924  
Other corporate expenses 0     0         0 0  
Stock-based compensation 0     0         0 0  
Other segment items 1,482     445         1,636 282  
Net income (loss) before provision for income taxes 11,487     9,485         30,959 25,492  
Investments in other entities 0               0   0
Segment assets 205,472               205,472   196,853
Cash paid for purchases of property, plant and equipment                 9,259 16,140  
Fuel Station Services | Operating Segments | Intersubsegment Eliminations                      
Segment Reporting [Line Items]                      
Total revenues 50,100     57,116         162,337 164,105  
Renewable Power                      
Segment Reporting [Line Items]                      
Total revenues [6],[7] 7,262     8,714         20,947 24,144  
Renewable Power | Intersegment Eliminations                      
Segment Reporting [Line Items]                      
Total revenues 0     0         0 0  
Renewable Power | Operating Segments                      
Segment Reporting [Line Items]                      
Total revenues 7,262     8,714         20,947 24,144  
Cost of sales 7,296     6,562         20,551 22,157  
Loss from equity method investments 0     0         0 0  
Interest and financing expense, net (16)     (20)         (58) (48)  
Project development and startup costs 0     0         0 0  
Impairment loss 0               3,595    
Depreciation, amortization, and accretion 712     962         2,092 2,863  
Other corporate expenses 0     0         0 0  
Stock-based compensation 0     0         0 0  
Other segment items 36     67         156 190  
Net income (loss) before provision for income taxes (766)     1,143         (5,389) (1,018)  
Investments in other entities 0               0   0
Segment assets 30,810               30,810   $ 28,740
Cash paid for purchases of property, plant and equipment                 0 491  
Renewable Power | Operating Segments | Intersubsegment Eliminations                      
Segment Reporting [Line Items]                      
Total revenues $ 7,262     $ 8,714         $ 20,947 $ 24,144  
[1] Includes amounts related to consolidated VIEs, which are presented separately in the table below.
[2]
Includes revenues from related parties of $16,917 and $55,658 for the nine months ended September 30, 2026 and 2025, respectively.
[3] Includes revenues from related parties of $0 and $17,825 for the three months ended September 30, 2026 and 2025, respectively.
[4]
Includes revenues from related parties of $19,022 and $40,921 for the nine months ended September 30, 2026 and 2025, respectively.
[5] Includes revenues from related parties of $2,664 and $11,492 for the three months ended September 30, 2026 and 2025, respectively
[6]
Includes revenues from related parties of $872 and $4,676 for the nine months ended September 30, 2026 and 2025, respectively.
[7] Includes revenues from related parties of $0 and $2,022 for the three months ended September 30, 2026 and 2025, respectively.