Related Party Transactions - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended
	Jan. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Oct. 20, 2020	Oct. 19, 2020	Oct. 15, 2019
Related Party Transaction [Line Items]
Accrued interest - related party		$ 2,606,000			$ 2,606,000		$ 2,249,000
Accrued interest - related party		$ 2,606,000			$ 2,606,000		$ 2,249,000
Collateral deposit				$ 900,000
Common stock, shares issued		12,972,815			12,972,815		12,972,815
Warrants, exercise price							$ 0.01	$ 0.01	$ 2.50
Property, equipment, and land, net		$ 28,800,000			$ 28,800,000		$ 28,240,000
CNG Tractors [Member]
Related Party Transaction [Line Items]
Common stock, shares issued										1,174,800
Warrant issued										1,174,800
Warrants, exercise price										$ 2.50
Property, equipment, and land, net										$ 3,500,000
Accrued expenses										$ 3,500,000
Description of warrants					Company entered into an agreement with an existing stockholder to purchase used CNG tractors in exchange for 1,174,800 shares of the Company’s common stock and a warrant to purchase 1,174,800 shares of the Company’s common stock at an exercise price of $2.50 per share.
Common Stock [Member]
Related Party Transaction [Line Items]
Debt repayment in the form shares				8,664
Officer [Member]
Related Party Transaction [Line Items]
Recognized operating lease expense		100,000	$ 300,000		$ 500,000	$ 800,000
Operating lease liabilities		$ 0			$ 0		$ 0
Sheehy Enterprises, Inc. [Member] | Collateral Security Pledge Agreement [Member]
Related Party Transaction [Line Items]
Collateral deposit	$ 900,000
Related party transaction, expiration date	Mar. 01, 2020