v3.26.1
Segment Information - Summary of Operating Revenue and Significant Expenses, by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenue $ 46,428 $ 42,603  
Royalties, transportation, gathering and production fuel 8,037 7,571  
Depreciation, depletion and amortization 8,373 6,264  
Impairment 443 2,047  
Total operating expenses 48,027 42,193  
Operating (loss) income (1,599) 410  
Other expenses (income) (1,306) 1,191  
Loss before income taxes (293) (781)  
Assets 467,780 354,226 $ 435,460
Capital expenditures 30,867 11,632  
Operating Segments [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenue 42,192 42,603  
Payroll and related expenses 3,683 [1] 3,093 [2]  
Wellfield operating and maintenance 2,489 [1] 2,372 [2]  
Plant expense 836 [1] 945 [2]  
Waste disposal 569 [1] 584 [2]  
Preventative maintenance 4,700 [1] 4,159 [2]  
Breakdown expenses 531 [1] 893 [2]  
Utility expense 4,544 [1] 4,039 [2]  
Royalties, transportation, gathering and production fuel 8,037 [1] 7,571 [2]  
Depreciation, depletion and amortization 8,301 [1] 6,210 [2]  
Impairment 443 [1] 2,047 [2]  
Other operating expenses 1,485 [1],[3] 1,342 [2],[4]  
Total operating expenses 35,618 33,255  
Operating (loss) income 6,574 9,348  
Other expenses (income) 11 17  
Loss before income taxes 6,563 9,331  
Assets 419,174 304,461  
Capital expenditures 30,818 11,551  
Corporate and Other [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenue 4,236 0  
Payroll and related expenses 4,450 5,158  
Total operating expenses 12,409 [5] 8,938 [6]  
Operating (loss) income (8,173) (8,938)  
Other expenses (income) (1,317) [7] 1,174 [8]  
Loss before income taxes (6,856) (10,112)  
Assets 48,606 49,765  
Capital expenditures 49 81  
RNG [Member] | Operating Segments [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenue 38,075 38,451  
Payroll and related expenses 2,372 [1] 2,410 [2]  
Wellfield operating and maintenance 1,920 [1] 1,655 [2]  
Plant expense 561 [1] 619 [2]  
Waste disposal 510 [1] 570 [2]  
Preventative maintenance 3,695 [1] 3,550 [2]  
Breakdown expenses 283 [1] 445 [2]  
Utility expense 4,398 [1] 3,926 [2]  
Royalties, transportation, gathering and production fuel 7,581 [1] 7,114 [2]  
Depreciation, depletion and amortization 7,088 [1] 4,900 [2]  
Impairment 308 [1] 1,993 [2]  
Other operating expenses 614 [1],[3] 900 [2],[4]  
Total operating expenses 29,330 28,082  
Operating (loss) income 8,745 10,369  
Other expenses (income) (3) 8  
Loss before income taxes 8,748 10,361  
Assets 192,876 188,732  
Capital expenditures 2,569 7,568  
REG [Member] | Operating Segments [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenue 4,117 4,152  
Payroll and related expenses 1,311 [1] 683 [2]  
Wellfield operating and maintenance 569 [1] 717 [2]  
Plant expense 275 [1] 326 [2]  
Waste disposal 59 [1] 14 [2]  
Preventative maintenance 1,005 [1] 609 [2]  
Breakdown expenses 248 [1] 448 [2]  
Utility expense 146 [1] 113 [2]  
Royalties, transportation, gathering and production fuel 456 [1] 457 [2]  
Depreciation, depletion and amortization 1,213 [1] 1,310 [2]  
Impairment 135 [1] 54 [2]  
Other operating expenses 871 [1],[3] 442 [2],[4]  
Total operating expenses 6,288 5,173  
Operating (loss) income (2,171) (1,021)  
Other expenses (income) 14 9  
Loss before income taxes (2,185) (1,030)  
Assets 226,298 115,729  
Capital expenditures $ 28,249 $ 3,983  
[1] Significant expenses regularly reviewed by the CODM.
[2] Significant expenses regularly reviewed by the CODM.
[3] The majority of other operating expenses for RNG and REG are consumables, rent, environmental compliance and general and administrative expenses.
[4] The majority of other operating expenses for RNG and REG are consumables, rent, environmental compliance and general and administrative expenses.
[5] The majority of operating expenses for Corporate and other are payroll and related expenses of $4,450, insurance of $1,070 and professional and IT fees of $1,717.
[6] The majority of operating expenses for Corporate and other are payroll and related expenses of $5,158, insurance of $1,330 and professional and IT fees of $1,360.
[7] The majority of other expense (income) for Corporate and other are interest expense of $1,335 and income from equity investment of ($3,320).
[8] The majority of other expense (income) for Corporate and other is interest expense of $1,243.