Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue:
Sales of fuel cell systems and related infrastructure	$ 2,197	$ 5,218
Services performed on fuel cell systems and related infrastructure	5,149	5,273
Power Purchase Agreements	4,311	2,706
Fuel delivered to customers	3,491	2,010
Other	87	125
Total revenue	15,235	15,332
Cost of revenue:
Sales of fuel cell systems and related infrastructure	2,286	3,898
Services performed on fuel cell systems and related infrastructure	6,566	5,783
Power Purchase Agreements	6,615	2,881
Fuel delivered to customers	4,149	2,411
Other	98	189
Total cost of revenue	19,714	15,162
Gross profit (loss)	(4,479)	170
Operating expenses:
Research and development	5,998	4,830
Selling, general and administrative	9,145	8,290
Total operating expenses	15,143	13,120
Operating loss	(19,622)	(12,950)
Interest and other (expense) income, net	(2,137)	(474)
Change in fair value of common stock warrant liability	(2,280)	1,278
Loss before income taxes	(24,039)	(12,146)
Income tax benefit		392
Net loss attributable to the Company	(24,039)	(11,754)
Preferred stock dividends declared	(26)	(26)
Net loss attributable to common shareholders	$ (24,065)	$ (11,780)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.13)	$ (0.07)
Weighted average number of common shares outstanding	191,185,690	180,125,763