Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash	$ 6,713	$ 26,644
Accounts receivable - trade, net	27,194	13,033
Alternative fuels tax credit receivable	312	1,054
Due from related party	10	40
Prepaids and other current assets	3,569	2,205
Total current assets	37,798	42,976
Non-current assets
Property, equipment, and land, net	28,800	28,240
Goodwill	23,837	23,837
Intangible assets, net	4,406	5,087
Operating lease right-of-use assets, net	7,784	10,473
Finance lease right-of-use assets, net	24,786	27,913
Deposits and other long-term assets	4,938	3,797
Total non-current assets	94,551	99,347
Total assets	132,349	142,323
Current liabilities
Accounts payable	10,981	11,698
Accrued expenses and other current liabilities	15,115	18,589
Accrued interest - related party	2,606	2,249
Embedded derivative liability	871	2,278
Warrant liabilities	9,021	11,264
Advances under factoring arrangements, current portion	17,422	24,397
Current portion of long-term debt	21,640	12,727
Current portion of long-term debt - related party	24,861	50,252
Operating lease liabilities, current portion	4,038	3,801
Finance lease liabilities, current portion	4,632	4,597
Total current liabilities	111,187	141,852
Non-current liabilities
Advances under factoring arrangements, current portion	5,635
Long-term debt, less current portion	7,322	24,737
Long-term debt, less current portion - related party	11,497	3,379
Operating lease liabilities, less current portion	3,731	6,553
Finance lease liabilities, less current portion	21,883	24,884
Deferred tax liability	60	17
Total non-current liabilities	50,128	59,570
Total liabilities	161,315	201,422
Commitments and contingencies (Note 11)
Stockholders’ deficit
Common stock, $0.0001 par value; 100,000,000 shares authorized; 12,972,815 (September 30, 2021 and December 31, 2020) shares issued and outstanding	2	2
Common stock subscribed and not yet issued 330 (September 30, 2021) and 80 (December 31, 2020)
Common stock issuable	4,390	3,474
Additional paid-in capital	32,153	30,821
Accumulated deficit	(74,221)	(101,619)
Total stockholders’ deficit	(37,676)	(67,322)
Total liabilities, temporary equity, and stockholders' deficit	132,349	142,323
Series A Redeemable Convertible Preferred Stock [Member]
Temporary Equity
Redeemable stock	425	398
Series B Redeemable Convertible Preferred Stock [Member]
Temporary Equity
Redeemable stock	7,085	6,625
Redeemable Common Stock [Member]
Temporary Equity
Redeemable stock	$ 1,200	$ 1,200