Related Party Transactions - Additional Information (Details) - USD ($)					1 Months Ended	3 Months Ended				6 Months Ended
	Nov. 18, 2019	Nov. 07, 2019	Apr. 01, 2019	Jan. 07, 2019	Jan. 31, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Feb. 27, 2020	Oct. 15, 2019
Related Party Transaction [Line Items]
Accounts payable converted to common stock									$ 10,000
Accounts payable - related party amount settled											$ 45,000
Accrued interest - related party						$ 1,958,000	$ 1,482,000			$ 1,958,000
Common stock, shares issued						12,102,498	12,093,834			12,102,498
Property, equipment and land, net						$ 37,108,000	$ 41,731,000			$ 37,108,000
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. Although the Company has taken possession of the tractors, as of December 31, 2019, the issuance of the common stock and the warrant had not yet occurred. Accordingly, the Company has recorded $3.5 million related to the tractors within property, equipment, and land, net on its consolidated balance sheet, with an associated $3.5 million related to the Company’s obligation to issue the common stock and the warrant to purchase common stock within common stock issuable.
Common Stock [Member]
Related Party Transaction [Line Items]
Debt repayment in the form shares							8,664
Common stock, shares issued												1,260,000	1,260,000
Former Officer [Member]
Related Party Transaction [Line Items]
Accounts payable converted to common stock			$ 100,000
Payment of principal amount to Peck			38,000
Accounts payable - related party amount settled			300,000
Former Officer [Member] | Gain on Conversion of Accounts Payable [Member]
Related Party Transaction [Line Items]
Gain associated with issuance of common stock			$ 200,000
Former Officer [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Related party accounts payable converted to common stock, shares			117,092
Officer [Member]
Related Party Transaction [Line Items]
Recognized operating lease expense						300,000		$ 100,000		$ 600,000	300,000
Officer [Member] | Accounts Payable
Related Party Transaction [Line Items]
Operating lease liabilities						$ 0		$ 100,000		$ 0	$ 100,000
Officer and Sheehy Enterprises Inc [Member]
Related Party Transaction [Line Items]
Payment of principal amount to Peck				$ 150,000
Sheehy Enterprises, Inc. [Member] | Intercompany Agreement [Member]
Related Party Transaction [Line Items]
Payment of principal amount to Peck		$ 400,000
Repayments of related party notes		400,000
Aggregate principal amount		48,000
Accrued interest - related party		40,000
Gain or loss on settlement of related party debt		$ 0
Sheehy Enterprises, Inc. [Member] | Collateral Security Pledge Agreement [Member]
Related Party Transaction [Line Items]
Security deposit					$ 300,000
Related party transaction, expiration date					Mar. 01, 2020
Sheehy Enterprises, Inc. [Member] | Common Stock [Member] | Intercompany Agreement [Member]
Related Party Transaction [Line Items]
Debt repayment in the form shares	35,156	35,156