Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net income (loss)	$ 27,398	$ (32,645)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	11,371	10,931
Non-cash lease expense	2,903	3,042
Loss on sale of fixed assets	78	206
Amortization of debt discount and debt issuance costs	793	1,819
Deferred income taxes	43	(255)
Stock-based compensation expense	527	428
Non-cash interest expense	4,768	2,758
Bad debt expense	1	57
Change in fair value of embedded derivative liability	(1,407)	(661)
Change in fair value of warrant liabilities	(2,243)	(5,534)
Change in fair value of contingent consideration		296
(Gain) loss on extinguishment of debt	(10,953)	10,010
Changes in assets and liabilities
Accounts receivable - trade	(14,162)	(4,705)
Alternative fuels tax credit receivable	742	1,460
Due from related party	30
Other assets	(2,502)	(2,303)
Accounts payable	(721)	(7,048)
Accrued expenses and other current liabilities	(2,924)	3,534
Accrued interest - related party	357	844
Operating lease liabilities	(4,092)	(3,253)
Net cash provided by (used in) operating activities	10,007	(21,019)
Cash flows from investing activities
Purchases of equipment	(7,132)	(61)
Proceeds from sale of assets	315	430
Net cash provided by (used in) investing activities	(6,817)	369
Cash flows from financing activities
Proceeds from sale of common stock, preferred stock and warrants		6,150
Proceeds from issuance of debt	5,749	10,000
Payments of principal on debt	(4,306)	(4,430)
Proceeds from issuance of debt - related party		6,150
Payments of principal on debt - related party	(18,513)	(266)
Payment of prepayment penalty fees - related party	(777)
Advances from factoring arrangements	147,233	132,294
Payments on factoring arrangements	(149,451)	(122,461)
Debt issuance costs		(296)
Payments on finance lease liabilities	(3,056)	(2,487)
Net cash provided by (used in) financing activities	(23,121)	24,654
Net increase in cash	(19,931)	(17,384)
Cash - beginning of year	26,644	3,274
Cash - end of year	6,713	(14)
Supplemental disclosure of cash flow information:
Income tax paid	783	1
Interest paid	471	3,046
Supplemental schedule of non-cash investing and financing activities:
Right-of-use assets obtained in exchange for finance lease liabilities	1,636	18,490
Right-of-use assets obtained in exchange for operating lease liabilities	1,507	3,379
Fair value of warrants and common stock issued in connection with financing arrangements	$ 2,208
Held-for-sale assets sold for noncash consideration		$ 450