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Segment Information - Summary of Reconciliation of the Company's Reportable Segments' Net Income (Loss) from Continuing Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total operating revenue $ 42,603 $ 38,787  
Less      
Payroll and related expenses 8,251 [1] 8,643 [2]  
Wellfield operating and maintenance 2,372 [1] 1,619 [2]  
Plant expense 945 [1] 801 [2]  
Waste disposal 584 [1] 441 [2]  
Preventative maintenance 4,159 [1] 3,184 [2]  
Breakdown expenses 893 [1] 376 [2]  
Utility expense 4,039 [1] 4,003 [2]  
Insurance 1,330 [1] 1,532 [2]  
Professional and IT fees 1,360 [1] 1,282 [2]  
Royalties, transportation, gathering and production fuel 7,571 [1] 6,518 [2]  
Depreciation, depletion and amortization 6,264 [1] 5,434 [2]  
Impairment 2,047 [1] 528 [2]  
Other operating expenses 2,378 [1],[3],[4] 2,058 [2],[5],[6]  
Total operating expenses 42,193 [1] 36,419 [2]  
Operating income 410 2,368  
Interest expense 1,243 1,165  
Other expense (income) (52) (1,060)  
(Loss) income before income taxes (781) 2,263  
Total assets 354,226 354,689 $ 349,015
Capital expenditures 11,632 21,986  
Net income (loss) (464) 1,850  
Income tax expense (317) 413  
Transaction costs 0 61  
RNG [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total operating revenue 38,451 33,988  
Less      
Payroll and related expenses 2,410 [1] 2,168 [2]  
Wellfield operating and maintenance 1,655 [1] 1,048 [2]  
Plant expense 619 [1] 494 [2]  
Waste disposal 570 [1] 428 [2]  
Preventative maintenance 3,550 [1] 2,728 [2]  
Breakdown expenses 445 [1] 295 [2]  
Utility expense 3,926 [1] 3,942 [2]  
Insurance 0 [1] 0 [2]  
Professional and IT fees 0 [1] 0 [2]  
Royalties, transportation, gathering and production fuel 7,114 [1] 5,997 [2]  
Depreciation, depletion and amortization 4,900 [1] 4,076 [2]  
Impairment 1,993 [1] 216 [2]  
Other operating expenses 900 [1],[3],[4] 1,016 [2],[5],[6]  
Total operating expenses 28,082 [1] 22,408 [2]  
Operating income 10,369 11,580  
Interest expense 0 0  
Other expense (income) 8 22  
(Loss) income before income taxes 10,361 11,558  
Total assets 188,732 181,150  
Capital expenditures 7,568 9,041  
REG [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total operating revenue 4,152 4,799  
Less      
Payroll and related expenses 683 [1] 602 [2]  
Wellfield operating and maintenance 717 [1] 571 [2]  
Plant expense 326 [1] 307 [2]  
Waste disposal 14 [1] 13 [2]  
Preventative maintenance 609 [1] 456 [2]  
Breakdown expenses 448 [1] 81 [2]  
Utility expense 113 [1] 61 [2]  
Insurance 0 [1] 0 [2]  
Professional and IT fees 0 [1] 0 [2]  
Royalties, transportation, gathering and production fuel 457 [1] 521 [2]  
Depreciation, depletion and amortization 1,310 [1] 1,297 [2]  
Impairment 54 [1] 312 [2]  
Other operating expenses 442 [1],[3],[4] 200 [2],[5],[6]  
Total operating expenses 5,173 [1] 4,421 [2]  
Operating income (1,021) 378  
Interest expense 0 1  
Other expense (income) 9 (1,011)  
(Loss) income before income taxes (1,030) 1,388  
Total assets 115,729 87,071  
Capital expenditures 3,983 12,826  
Corporate [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total operating revenue 0 0  
Less      
Payroll and related expenses 5,158 [1] 5,873 [2]  
Wellfield operating and maintenance 0 [1] 0 [2]  
Plant expense 0 [1] 0 [2]  
Waste disposal 0 [1] 0 [2]  
Preventative maintenance 0 [1] 0 [2]  
Breakdown expenses 0 [1] 0 [2]  
Utility expense 0 [1] 0 [2]  
Insurance 1,330 [1] 1,532 [2]  
Professional and IT fees 1,360 [1] 1,282 [2]  
Royalties, transportation, gathering and production fuel 0 [1] 0 [2]  
Depreciation, depletion and amortization 54 [1] 61 [2]  
Impairment 0 [1] 0 [2]  
Other operating expenses 1,036 [1],[3],[4] 842 [2],[5],[6]  
Total operating expenses 8,938 [1] 9,590 [2]  
Operating income (8,938) (9,590)  
Interest expense 1,243 1,164  
Other expense (income) (69) (71)  
(Loss) income before income taxes (10,112) (10,683)  
Total assets 49,765 86,468  
Capital expenditures $ 81 $ 119  
[1] Significant expenses regularly provided to the CODM.
[2] Significant expenses regularly provided to the CODM.
[3] The majority of other operating expenses for Corporate are office expenses, board of director and corporate filing fees.
[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 other operating expenses for Corporate are office expenses, board of director and corporate filing fees.
[6] The majority of other operating expenses for RNG and REG are consumables, rent, environmental compliance and general and administrative expenses.