Debt - NG Advantage Debt and Financing Lease Obligations (Details) $ in Thousands						3 Months Ended	9 Months Ended
	Jan. 31, 2022 USD ($)	Dec. 10, 2020 USD ($)	Dec. 20, 2018 USD ($)	Mar. 01, 2018 USD ($) installment	Dec. 18, 2017 USD ($) installment	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Nov. 30, 2016 USD ($) installment
Long-term debt [Line Items]
Principal Balance						$ 28,663	$ 28,663		$ 36,132
Total restricted cash						0	0		7,008
Loss on extinguishment of debt						0	2,268	$ 25
Proceeds from revolving line of credit							0	1,450
Repayments of borrowing under revolving line of credit							0	$ 1,450
Held as collateral
Long-term debt [Line Items]
Total restricted cash	$ 7,000					0	0		7,008
Compression Station
Long-term debt [Line Items]
Purchase price			$ 7,000
Sale leaseback transaction, term			5 years
Annual rate (as a percent)			12.00%
Monthly rental payments			$ 100
Sale Leaseback Transaction, Security Deposit, Amount	800
Sale Leaseback Transaction, outstanding principal balance							0
BoA | BoA MLA
Long-term debt [Line Items]
Interest rate					4.86%
Principal Balance						100	100
Proceeds from sale of equipment in sale-leaseback agreement					$ 2,100
Sale leaseback transaction, term					5 years
Number of equal monthly installments | installment					60
First National | First National MLA
Long-term debt [Line Items]
Interest rate				9.28%
Proceeds from sale of equipment in sale-leaseback agreement				$ 6,300
Sale leaseback transaction, term				6 years
Number of equal monthly installments | installment				72
Sale Leaseback Transaction, outstanding principal balance							0
Loan and Security Agreement [Member] | 5.17% Term Loan | Wintrust Commercial Finance
Long-term debt [Line Items]
Debt issuance amount										$ 4,700
Number of monthly installments | installment										72
Interest rate										5.17%
Principal Balance						100	100
NG Advantage debt
Long-term debt [Line Items]
Principal Balance						26,515	26,515		25,832
NG Advantage debt | 5.0% Term Loan | Berkshire Bank
Long-term debt [Line Items]
Principal Balance						12,600	12,600
NG Advantage debt | 5% maturing on January 1, 2026 | Berkshire Bank
Long-term debt [Line Items]
Debt issuance amount	$ 14,000	$ 14,500
Interest rate	5.00%	5.00%
Principal Balance						13,700	13,700
Period during which the debt instrument principal balance is required to be paid following its issuance		5 years
NG Advantage debt | 5% maturing on January 1, 2026 | Berkshire Bank | Standby letters of credit
Long-term debt [Line Items]
Loan pledged as collateral									$ 7,000
NG Advantage debt | Revolving line of credit | Berkshire Bank
Long-term debt [Line Items]
Maximum borrowing capacity (up to)		$ 1,000
Outstanding line of credit						$ 0	$ 0
Interest rate during period (as a percent)		3.00%
NG Advantage debt | Revolving line of credit | Berkshire Bank | Prime Rate
Long-term debt [Line Items]
Basis spread on variable rate		0.25%