Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 31,223	$ (13,702)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	3,624	3,470
Non-cash lease expense	2,279	958
(Gain) loss on sale of assets		(8)
Amortization of debt discount and debt issuance costs	230	946
Deferred income taxes	7	(97)
Stock-based compensation expense	232	368
Non-cash interest expense	2,425	711
Bad debt expense	1
Change in fair value of embedded derivative liability	(788)	45
Change in fair value of warrant liabilities	(3,107)	(8,235)
(Gain) loss on extinguishment of debt	(534)	10,086
Changes in assets and liabilities
Accounts receivable - trade	(5,644)	693
Alternative fuels tax credit receivable	819	(92)
Due from related party	30	(1)
Other assets	(1,595)	(2,018)
Accounts payable	(2,798)	698
Accrued expenses and other current liabilities	(6,764)	(8,822)
Accrued interest - related party	240	198
Operating lease liabilities	(2,187)	(1,079)
Net cash provided by (used in) operating activities	17,693	(15,881)
Cash flows from investing activities
Purchases of equipment	(72)	(36)
Proceeds from sale of assets		8
Net cash provided by (used in) investing activities	(72)	(28)
Cash flows from financing activities
Proceeds from sale of common stock, preferred stock and warrants		6,150
Payments of principal on debt	(1,283)	(1,731)
Proceeds from issuance of debt - related party		6,150
Payments of principal on debt - related party	(18,363)	(99)
Payment of prepayment penalty fees - related party	(777)
Advances from factoring arrangements	59,621	50,584
Payments on factoring arrangements	(65,919)	(44,244)
Debt issuance costs		(296)
Payments on finance lease liabilities	(1,257)	(552)
Net cash provided by (used in) financing activities	(27,978)	15,962
Net increase in cash	(10,357)	53
Cash - beginning of year	26,644	3,274
Cash - end of year	16,287	3,327
Supplemental disclosures of cash flow information:
Income tax paid	29
Interest paid	65	1,320
Supplemental schedule of non-cash investing and financing activities:
Right-of-use assets obtained in exchange for finance lease liabilities	356	5,974
Right-of-use assets obtained in exchange for operating lease liabilities		3,379
Fair value of warrants and common stock issued in connection with financing arrangements	$ 2,140
Held-for-sale assets sold for noncash consideration		$ 450