Segment Reporting - Schedule of Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 56,493	$ 51,951	$ 145,339	$ 107,677
Operating expenses excluding depreciation and amortization	(57,354)	(54,269)	(110,073)	(114,652)
Depreciation and amortization	(3,738)	(3,645)	(7,362)	(7,115)
Operating income (loss)	(4,599)	(5,963)	27,904	(14,090)
Trucking [Member]
Segment Reporting Information [Line Items]
Revenue	56,439	51,719	110,391	107,125
CNG Fueling Stations [Member]
Segment Reporting Information [Line Items]
Revenue	54	232	190	552
Operating Segment [Member] | Trucking [Member]
Segment Reporting Information [Line Items]
Revenue	56,439	51,719	145,149	107,125
Operating expenses excluding depreciation and amortization	(53,020)	(51,403)	(101,680)	(108,587)
Depreciation and amortization	(3,738)	(3,585)	(7,362)	(6,994)
Operating income (loss)	(319)	(3,269)	36,107	(8,456)
Operating Segment [Member] | CNG Fueling Stations [Member]
Segment Reporting Information [Line Items]
Revenue	54	232	190	552
Operating expenses excluding depreciation and amortization	(237)	(166)	(604)	(492)
Depreciation and amortization		(58)		(119)
Operating income (loss)	(183)	8	(414)	(59)
Corporate and Unallocated [Member]
Segment Reporting Information [Line Items]
Operating expenses excluding depreciation and amortization	(4,097)	(2,700)	(7,789)	(5,573)
Depreciation and amortization		(2)		(2)
Operating income (loss)	$ (4,097)	$ (2,702)	$ (7,789)	$ (5,575)