Debt - NG Advantage Debt and Financing Lease Obligations (Details) $ in Thousands					3 Months Ended		6 Months Ended
	Dec. 10, 2020 USD ($)	Dec. 20, 2018 USD ($)	Mar. 01, 2018 USD ($) installment	Dec. 18, 2017 USD ($) installment	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Nov. 30, 2016 USD ($) installment
Long-term debt [Line Items]
Principal Balance					$ 32,528		$ 32,528			$ 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	1,150
Repayments of borrowing under revolving line of credit							0	$ 650
Held as collateral
Long-term debt [Line Items]
Total restricted cash					0		0		$ 7,000	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%
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					200		200
NG Advantage debt
Long-term debt [Line Items]
Principal Balance					27,414		27,414			25,832
NG Advantage debt | Long-term portion of restricted cash | Berkshire Bank
Long-term debt [Line Items]
Loan pledged as collateral										7,000
NG Advantage debt | 5% maturing on January 1, 2026 | Berkshire Bank
Long-term debt [Line Items]
Debt issuance amount	$ 14,500								$ 14,000
Interest rate	5.00%								5.00%
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%