Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash	$ 7,329	$ 26,644
Accounts receivable - trade, net	22,697	13,033
Alternative fuels tax credit receivable	287	1,054
Due from related party	10	40
Prepaids and other current assets	2,150	2,205
Total current assets	32,473	42,976
Non-current assets
Property and equipment, net	27,962	28,240
Goodwill	23,837	23,837
Intangible assets, net	4,180	5,087
Operating lease right-of-use assets, net	7,155	10,473
Finance lease right-of-use assets, net	24,391	27,913
Deposits and other long-term assets	6,516	3,797
Total non-current assets	94,041	99,347
Total assets	126,514	142,323
Current liabilities
Accounts payable	16,245	11,698
Accrued expenses and other current liabilities	19,744	18,589
Accrued interest - related party	2,743	2,249
Embedded derivative liability	1,513	2,278
Warrant liabilities	13,784	11,264
Advances under factoring arrangements, current portion	9,073	24,397
Current portion of long-term debt	22,135	12,727
Current portion of long-term debt - related party	33,164	50,252
Operating lease liabilities, current portion	3,045	3,801
Finance lease liabilities, current portion	4,448	4,597
Total current liabilities	125,894	141,852
Non-current liabilities
Advances under factoring arrangements, less current portion	5,202
Long-term debt, less current portion	7,455	24,737
Long-term debt, less current portion - related party	4,023	3,379
Operating lease liabilities, less current portion	4,114	6,553
Finance lease liabilities, less current portion	21,790	24,884
Deferred tax liability	97	17
Total non-current liabilities	42,681	59,570
Total liabilities	168,575	201,422
Commitments and contingencies (Note 12)
Stockholders’ deficit
Common stock, $0.0001 par value; 100,000,000 shares authorized; 12,973,145 (December 31, 2021)and 12,972,815 (December 31, 2020) shares issued and outstanding	2	2
Common stock subscribed and not yet issued 0 (December 31, 2021) and 80 (December 31, 2020)
Common stock issuable	4,390	3,474
Additional paid-in capital	32,039	30,821
Accumulated deficit	(87,366)	(101,619)
Total stockholders’ deficit	(50,935)	(67,322)
Total liabilities, temporary equity, and stockholders' deficit	126,514	142,323
Series A Redeemable Convertible Preferred Stock [Member]
Temporary Equity
Redeemable stock	434	398
Series B Redeemable Convertible Preferred Stock [Member]
Temporary Equity
Redeemable stock	7,240	6,625
Redeemable Common Stock [Member]
Temporary Equity
Redeemable stock	$ 1,200	$ 1,200