Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash	$ 16,287	$ 26,644
Accounts receivable - trade, net	18,678	13,033
Alternative fuels tax credit receivable	234	1,054
Due from related party	10	40
Prepaids and other current assets	2,763	2,205
Total current assets	37,972	42,976
Non-current assets
Property and equipment, net	26,395	28,240
Goodwill	23,837	23,837
Intangible assets, net	4,857	5,087
Operating lease right-of-use assets, net	8,212	10,473
Finance lease right-of-use assets, net	25,844	27,913
Deposits and other long-term assets	4,834	3,797
Total non-current assets	93,979	99,347
Total assets	131,951	142,323
Current liabilities
Accounts payable	8,902	11,698
Accrued expenses and other current liabilities	11,430	18,589
Accrued interest - related party	2,489	2,249
Embedded derivative liability	1,490	2,278
Warrant liabilities	8,157	11,264
Advances under factoring arrangements, current portion	11,875	24,397
Current portion of long-term debt	20,167	12,727
Current portion of long-term debt - related party	29,666	50,252
Operating lease liabilities, current portion	3,337	3,801
Finance lease liabilities, current portion	4,512	4,597
Total current liabilities	102,025	141,852
Non-current liabilities
Advances under factoring arrangements, less current portion	6,502
Long-term debt, less current portion	15,980	24,737
Long-term debt, less current portion - related party	4,957	3,379
Operating lease liabilities, less current portion	4,829	6,553
Finance lease liabilities, less current portion	23,138	24,884
Deferred tax liability	24	17
Total non-current liabilities	55,430	59,570
Total liabilities	157,455	201,422
Commitments and contingencies (Note 11)
Stockholders’ deficit
Common stock, $0.0001 par value; 100,000,000 shares authorized; 12,972,815 (March 31, 2021 and December 31, 2020) shares issued and outstanding	2	2
Common stock subscribed and not yet issued 330 (March 31, 2021) and 80 (December 31, 2020)	0	0
Common stock issuable	4,390	3,474
Additional paid-in capital	32,116	30,821
Accumulated deficit	(70,396)	(101,619)
Total stockholders’ deficit	(33,888)	(67,322)
Total liabilities, temporary equity, and stockholders' deficit	131,951	142,323
Series A Redeemable Convertible Preferred Stock [Member]
Temporary Equity
Redeemable stock	407	398
Series B Redeemable Convertible Preferred Stock [Member]
Temporary Equity
Redeemable stock	6,777	6,625
Redeemable Common Stock [Member]
Temporary Equity
Redeemable stock	$ 1,200	$ 1,200