Revenues from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Summary of Company's Revenue by Major Source

The following tables display the Company’s revenue by major source, excluding realized and unrealized gains or losses under the Company’s gas hedge program, based on product type and timing of transfer of goods and services for the years ended December 31, 2021, 2020 and 2019:

	Year Ended December 31, 2021
	Goods transferred at a point in time		Goods Transferred over time		Total
Major Goods/Service Line:
Natural Gas Commodity	$	15,178	$	32,143	$	47,321
Natural Gas Environmental Attributes		84,906		—		84,906
Electric Commodity		—		9,692		9,692
Electric Environmental Attributes		6,208		—		6,208
	$	106,292	$	41,835	$	148,127
Operating Segment:
RNG	$	100,084	$	32,143	$	132,227
REG		6,208		9,692		15,900
	$	106,292	$	41,835	$	148,127

	Year Ended December 31, 2020
	Goods transferred at a point in time		Goods Transferred over time		Total
Major Goods/Service Line:
Natural Gas Commodity	$	6,991	$	22,467	$	29,458
Natural Gas Environmental Attributes		54,098		—		54,098
Electric Commodity		—		9,642		9,642
Electric Environmental Attributes		7,023		—		7,023
	$	68,112	$	32,109	$	100,221
Operating Segment:
RNG	$	61,089	$	22,467	$	83,556
REG		7,023		9,642		16,665
	$	68,112	$	32,109	$	100,221

	Year Ended December 31, 2019
	Goods transferred at a point in time		Goods transferred over time		Total
Major Goods/Service Line:
Natural Gas Commodity	$	6,591	$	25,594	$	32,185
Natural Gas Environmental Attributes		52,204		—		52,204
Electric Commodity		—		12,396		12,396
Electric Environmental Attributes		7,231		—		7,231
	$	66,026	$	37,990	$	104,016
Operating Segment:
RNG	$	58,795	$	25,594	$	84,389
REG		7,231		12,396		19,627
	$	66,026	$	37,990	$	104,016