Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 14,253	$ (46,848)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	15,234	14,760
Non-cash lease expense	3,964	4,462
Loss on sale of assets	154	1,269
Amortization of debt discount and debt issuance costs	1,103	2,066
Deferred income taxes	80	(358)
Stock-based compensation expense	577	536
Impairment of long-lived assets	0	2,302
Non-cash interest expense	5,996	5,536
Bad debt expense	79	82
Change in fair value of embedded derivative liability	(765)	1,257
Change in fair value of warrant liabilities	2,520	(1,975)
Change in fair value of contingent consideration	0	296
(Gain) loss on extinguishment of debt	(10,953)	9,994
Changes in assets and liabilities
Accounts receivable - trade	(9,741)	(1,433)
Alternative fuels tax credit receivable	766	1,388
Due from related party	30	0
Other assets	(2,664)	(922)
Accounts payable	4,545	(4,562)
Accrued expenses and other current liabilities	1,705	5,708
Accrued interest - related party	494	767
Operating lease liabilities	(3,829)	(4,347)
Net cash provided by (used in) operating activities	23,548	(10,022)
Cash flows from investing activities
Purchases of equipment	(7,430)	(92)
Proceeds from sale of assets	315	1,030
Net cash provided by (used in) investing activities	(7,115)	938
Cash flows from financing activities
Proceeds from sale of common stock, preferred stock and warrants	0	6,150
Proceeds from issuance of debt	6,469	26,692
Payments of principal on debt	(5,496)	(5,880)
Proceeds from issuance of debt - related party	0	6,150
Payments of principal on debt - related party	(18,594)	(966)
Payment of prepayment penalty fees - related party	(777)	0
Advances from factoring arrangements	214,343	185,438
Payments on factoring arrangements	(225,798)	(180,811)
Debt issuance costs	0	(674)
Payments on finance lease liabilities	(5,895)	(3,645)
Net cash provided by (used in) financing activities	(35,748)	32,454
Net increase in cash	(19,315)	23,370
Cash - beginning of year	26,644	3,274
Cash - end of year	7,329	26,644
Supplemental disclosures of cash flow information:
Income tax paid	1,122	91
Interest paid	689	3,409
Supplemental schedule of non-cash investing and financing activities:
Fair value of warrants and common stock issued in connection with financing arrangements	2,208	1,370
Held-for-sale assets sold for noncash consideration	$ 0	$ 450