Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
Sales of fuel cell systems and related infrastructure	$ 5,218	$ 5,090
Services performed on fuel cell systems and related infrastructure	5,273	2,645
Power Purchase Agreements	2,706	977
Fuel delivered to customers	2,010	659
Other	125	45
Total revenue	15,332	9,416
Cost of revenue:
Sales of fuel cell systems and related infrastructure	3,898	5,079
Services performed on fuel cell systems and related infrastructure	5,783	4,770
Power Purchase Agreements	2,881	751
Fuel delivered to customers	2,411	876
Other	189	51
Total cost of revenue	15,162	11,527
Gross profit (loss)	170	(2,111)
Operating expenses:
Research and development	4,830	2,901
Selling, general and administrative	8,290	7,749
Total operating expenses	13,120	10,650
Operating loss	(12,950)	(12,761)
Interest and other income	87	31
Change in fair value of common stock warrant liability	1,278	1,769
Interest and other expense	(561)	(90)
Loss before income taxes	(12,146)	(11,051)
Income tax benefit	392
Net loss attributable to the Company	(11,754)	(11,051)
Preferred stock dividends declared	(26)	(26)
Net loss attributable to common shareholders	$ (11,780)	$ (11,077)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.07)	$ (0.06)
Weighted average number of common shares outstanding	180,125,763	173,365,830