v3.26.1
REPORTABLE SEGMENTS AND GEOGRAPHIC INFORMATION - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Total revenues $ 83,399 $ 80,456 $ 156,774 $ 165,863  
Cost of sales 58,929 57,044 112,778 115,681  
Income (loss) from equity method investments 597 (1,962) 2,354 (1,240)  
Interest and financing expense, net 6,546 6,367 12,430 12,432  
Project development and startup costs 3,301 3,477 5,116 9,558  
Impairment loss 4,142 0 4,142 0  
Depreciation, amortization, and accretion 5,167 5,264 10,780 11,206  
Other corporate expenses 7,828 9,647 18,836 20,317  
Stock-based compensation 2,060 2,205 4,115 3,956  
Other segment items 3,714 4,541 6,410 6,833  
Net loss before income tax benefit (8,885) (6,127) (20,187) (12,880)  
Income tax benefit 4,738 13,686 10,447 21,723  
Net loss (4,147) 7,559 (9,740) 8,843  
Investments in other entities [1] 234,298   234,298   $ 231,223
Segment assets [1] 1,040,244   1,040,244   959,469
Cash paid for purchases of property, plant and equipment     52,680 33,409  
Intersegment Eliminations          
Segment Reporting [Line Items]          
Total revenues 9,718 5,030 14,891 9,561  
Operating Segments          
Segment Reporting [Line Items]          
Total revenues 83,399 80,456 156,774 165,863  
Cost of sales 58,929 57,044 112,778 115,681  
Income (loss) from equity method investments 597 (1,962) 2,354 (1,240)  
Interest and financing expense, net 6,546 6,367 12,430 12,432  
Project development and startup costs 3,301 3,477 5,116 9,558  
Impairment loss 4,142   4,142    
Depreciation, amortization, and accretion 5,167 5,264 10,780 11,206  
Other corporate expenses 0 0 0 0  
Stock-based compensation 0 0 0 0  
Other segment items 3,714 4,541 6,410 6,833  
Net loss before income tax benefit 1,003 5,725 2,764 11,393  
Investments in other entities 234,298   234,298   231,223
Segment assets 933,164   933,164   901,581
Cash paid for purchases of property, plant and equipment     52,680 33,409  
Operating Segments | Intersubsegment Eliminations          
Segment Reporting [Line Items]          
Total revenues 93,117 85,486 171,665 175,424  
Corporate          
Segment Reporting [Line Items]          
Total revenues 0 0 0 0  
Cost of sales 0 0 0 0  
Income (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 7,828 9,647 18,836 20,317  
Stock-based compensation 2,060 2,205 4,115 3,956  
Other segment items 0 0 0 0  
Investments in other entities 0   0   0
Segment assets 107,080   107,080   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 loss before income tax benefit (9,888) (11,852) (22,951) (24,273)  
RNG fuel          
Segment Reporting [Line Items]          
Total revenues [2],[3] 23,821 25,130 45,459 52,729  
RNG fuel | Intersegment Eliminations          
Segment Reporting [Line Items]          
Total revenues 142 138 284 276  
RNG fuel | Operating Segments          
Segment Reporting [Line Items]          
Total revenues 23,821 25,130 45,459 52,729  
Cost of sales 12,282 11,414 25,111 23,567  
Income (loss) from equity method investments 597 (1,962) 2,354 (1,240)  
Interest and financing expense, net 7,596 6,387 13,932 12,404  
Project development and startup costs 3,301 3,477 5,116 9,558  
Impairment loss 0   0    
Depreciation, amortization, and accretion 3,143 2,995 6,236 5,954  
Other corporate expenses 0 0 0 0  
Stock-based compensation 0 0 0 0  
Other segment items 2,324 3,692 4,796 4,939  
Net loss before income tax benefit (5,422) (873) (12,086) (2,453)  
Investments in other entities 234,298   234,298   231,223
Segment assets 719,905   719,905   675,988
Cash paid for purchases of property, plant and equipment     45,461 20,108  
RNG fuel | Operating Segments | Intersubsegment Eliminations          
Segment Reporting [Line Items]          
Total revenues 23,963 25,268 45,743 53,005  
Fuel Station Services          
Segment Reporting [Line Items]          
Total revenues [4],[5] 53,064 47,026 97,630 97,704  
Fuel Station Services | Intersegment Eliminations          
Segment Reporting [Line Items]          
Total revenues 9,576 4,892 14,607 9,285  
Fuel Station Services | Operating Segments          
Segment Reporting [Line Items]          
Total revenues 53,064 47,026 97,630 97,704  
Cost of sales 40,362 38,731 75,752 78,453  
Income (loss) from equity method investments 0 0 0 0  
Interest and financing expense, net (1,027) (7) (1,460) 56  
Project development and startup costs 0 0 0 0  
Impairment loss 547   547    
Depreciation, amortization, and accretion 1,606 1,317 3,164 3,351  
Other corporate expenses 0 0 0 0  
Stock-based compensation 0 0 0 0  
Other segment items 217 (311) 154 (163)  
Net loss before income tax benefit 11,359 7,296 19,473 16,007  
Investments in other entities 0   0   0
Segment assets 191,151   191,151   196,853
Cash paid for purchases of property, plant and equipment     7,219 12,874  
Fuel Station Services | Operating Segments | Intersubsegment Eliminations          
Segment Reporting [Line Items]          
Total revenues 62,640 51,918 112,237 106,989  
Renewable Power          
Segment Reporting [Line Items]          
Total revenues [6],[7] 6,514 8,300 13,685 15,430  
Renewable Power | Intersegment Eliminations          
Segment Reporting [Line Items]          
Total revenues 0 0 0 0  
Renewable Power | Operating Segments          
Segment Reporting [Line Items]          
Total revenues 6,514 8,300 13,685 15,430  
Cost of sales 6,285 6,899 11,915 13,661  
Income (loss) from equity method investments 0 0 0 0  
Interest and financing expense, net (23) (13) (42) (28)  
Project development and startup costs 0 0 0 0  
Impairment loss 3,595   3,595    
Depreciation, amortization, and accretion 418 952 1,380 1,901  
Other corporate expenses 0 0 0 0  
Stock-based compensation 0 0 0 0  
Other segment items 1,173 1,160 1,460 2,057  
Net loss before income tax benefit (4,934) (698) (4,623) (2,161)  
Investments in other entities 0   0   0
Segment assets 22,108   22,108   $ 28,740
Cash paid for purchases of property, plant and equipment     0 427  
Renewable Power | Operating Segments | Intersubsegment Eliminations          
Segment Reporting [Line Items]          
Total revenues $ 6,514 $ 8,300 $ 13,685 $ 15,430  
[1] Includes amounts related to consolidated VIEs, which are presented separately in the table below.
[2]
Includes revenues from related parties of $17,167 and $37,979 for the six months ended June 30, 2026 and 2025, respectively.
[3] Includes revenues from related parties of $125 and $17,878 for the three months ended June 30, 2026 and 2025, respectively.
[4]
Includes revenues from related parties of $16,358 and $29,429 for the six months ended June 30, 2026 and 2025, respectively.
[5] Includes revenues from related parties of $3,251 and $12,826 for the three months ended June 30, 2026 and 2025, respectively
[6]
Includes revenues from related parties of $872 and $2,654 for the six months ended June 30, 2026 and 2025, respectively.
[7] Includes revenues from related parties of $0 and $1,488 for the three months ended June 30, 2026 and 2025, respectively.