Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands				1 Months Ended		3 Months Ended							9 Months Ended
	Mar. 09, 2021 USD ($)	Feb. 19, 2021 USD ($)	Jan. 19, 2021 USD ($)	Mar. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) Terminal	Jun. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) Installment $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) Acquisition Station Terminal	Sep. 30, 2020 USD ($)	Mar. 31, 2022 USD ($) $ / shares shares	Apr. 30, 2021 USD ($)	Oct. 20, 2020 $ / shares shares	Oct. 19, 2020 $ / shares shares	Dec. 31, 2019 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of main terminals in operation | Terminal						10							10
Number of acquisitions completed | Acquisition													7
Cash						$ 6,713			$ 26,644				$ 6,713
Working capital deficit						73,400							73,400
Stockholders' deficit				$ (33,888)		(37,676)	$ (43,019)	$ (33,888)	$ (67,322)	$ (53,064)	$ (44,791)	$ (34,152)	(37,676)	$ (53,064)					$ (12,673)
Operating cash flows													10,007	(21,019)
Net loss						(5,329)	$ 9,154	$ (31,223)		8,435	10,508	$ 13,702	(27,398)	32,645
Material debt & lease obligation						122,700							122,700
Pre-tax gain on extinguishment of debt						10,163				46			10,953	(10,010)
Warrants to purchase shares of common stock | shares				250,000				250,000
Warrants to purchase common stock | shares																	5,072,000	7,925,000
Warrants, exercise price | $ / shares									$ 0.01								$ 0.01	$ 2.50
Decrease in additional paid-in capital						32,153			$ 30,821				32,153
Change in fair value of warrant liabilities						(481)				1,726			(2,243)	(5,534)
Revenue recognized						68,860				52,389			214,199	160,066
Finance Lease, Right-of-Use Asset, after Accumulated Amortization						24,786			27,913				24,786
Operating Lease, Right-of-Use Asset						7,784			10,473				7,784
Trucking [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Revenue recognized						$ 68,769				$ 52,133			179,160	159,258
Other [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Revenue recognized													$ 34,758
ASU 2019-12 [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]						true							true
Change in Accounting Principle, Accounting Standards Update, Adoption Date						Jan. 01, 2021							Jan. 01, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]						true							true
USPS [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Nonrecurring cash receipts from settlement agreements													$ 28,500
Pre-tax nonrecurring revenue from settlement agreements													34,800
Compensation Received For Work Performed Under Settlement Agreement								$ 28,500
Payments for transportation settlements		$ 17,500	$ 7,100
Additional settlement payment including rate adjustments under settlement agreement									3,800
USPS [Member] | Other [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Revenue recognized								34,800
Triumph Business Capital [Member] | Letter of Intent and Memo of Understanding [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Transportation settlements fund held in reserve	$ 600
Proceeds from transportation settlements	$ 1,600			$ 7,100	$ 7,100			17,500
Repayment of factor advances								11,000
Amount retained to reduce outstanding principal amount of factoring advances								$ 6,900
Number of installments for repayment | Installment								48
Frequency of payments								monthly
Date of first required payment								Jan. 01, 2022
Funds held in reserve against advances utilized					$ 3,000
Funds held in reserve against advances				800				$ 800
Paycheck Protection Program Loan CARES Act [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Principal amount											$ 10,000
Note Purchase Agreements and Releases [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Pre-tax gain on extinguishment of debt													$ 400
Principal amount				4,000				4,000
Notes payable in cash				$ 600				$ 600								$ 100
Warrants to purchase shares of common stock | shares							1,481,453
Warrants, exercise price | $ / shares				$ 0.01			$ 0.01	$ 0.01
Note Purchase Agreements and Releases [Member] | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Warrants to purchase shares of common stock | shares				1,200,000				1,200,000
Note Purchase Agreements and Releases [Member] | Warrant Exercise Price of 2.50 Per Share [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Warrants, exercise price | $ / shares				$ 2.50				$ 2.50
Note Purchase Agreements and Releases [Member] | Warrant Exercise Price of 2.50 Per Share [Member] | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Warrants to purchase shares of common stock | shares				950,000				950,000
Subsequent Event [Member] | Bridge Loan and Executive Loans [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Aggregate amount															$ 9,800
Subsequent Event [Member] | Amendments to Secured Convertible Promissory Notes [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Aggregate amount															$ 9,500
Warrants to purchase common stock | shares															7,553,750
Warrants, exercise price | $ / shares															$ 0.01
Antara Financing Agreement [Member] | Main Street Loan [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Principal amount due				$ 16,700				$ 16,700	33,600
Principal amount									17,000
Settlement Agreement [Member] | USPS [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Deferred gain recognized									$ 6,300
CNG [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of fueling stations | Station													1
Number of dedicated stations | Station													3