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Consolidated Statements of Operations (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenue and cost of goods sold        
Hydrocarbon revenue $ 713 $ 740 $ 1,011 $ 1,257
Grant and other revenue 232 229 497 513
Total revenues 8,113 8,924 14,433 14,823
Cost of goods sold 9,989 9,898 19,212 19,132
Gross loss (1,876) (974) (4,779) (4,309)
Operating expenses        
Research and development expense 1,469 1,765 2,513 3,487
Selling, general and administrative expense 2,147 3,792 4,066 8,271
Total operating expenses 3,616 5,557 6,579 11,758
Loss from operations (5,492) (6,531) (11,358) (16,067)
Other (expense) income        
Interest expense (2,246) (2,029) (4,396) (4,064)
(Loss)/Gain on conversion of debt       285
(Loss)/Gain on extinguishment of warrant liability (923) 1,775 (923) 1,775
(Loss)/Gain from change in fair value of the 2017 Notes (940) (340) (1,775) 3,425
(Loss)/Gain from change in fair value of derivative warrant liability (10,573) (7,247) (5,325) (7,080)
Loss on issuance of equity (1,519)   (1,519)  
Other income 206 2 206 13
Total other expense, net (15,995) (7,839) (13,732) (5,646)
Net loss $ (21,487) $ (14,370) $ (25,090) $ (21,713)
Net loss per share - basic and diluted $ (0.44) $ (1.10) $ (0.70) $ (2.03)
Weighted-average number of common shares outstanding - basic and diluted 49,085,638 13,009,434 36,050,983 10,673,891
Ethanol        
Revenue and cost of goods sold        
Sales $ 7,168 $ 7,955 $ 12,925 $ 13,053