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Debt - NG Advantage Debt and Financing Lease Obligations (Details)
$ in Thousands
9 Months Ended
Dec. 10, 2020
USD ($)
Dec. 20, 2018
USD ($)
Mar. 01, 2018
USD ($)
installment
Dec. 18, 2017
USD ($)
installment
Sep. 30, 2021
USD ($)
Nov. 30, 2016
USD ($)
installment
Long-term debt [Line Items]            
Loss on extinguishment of debt         $ 25  
Proceeds from revolving line of credit         1,450  
Repayments of borrowing under revolving line of credit         1,450  
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        
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      
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%
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          
Interest rate 5.00%          
Period during which the debt instrument principal balance is required to be paid following its issuance 5 years          
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  
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%