Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net revenue:
Net revenue	$ 40,813	$ 21,579
Cost of revenue:
Total cost of revenue	45,284	25,363
Gross loss	(4,471)	(3,784)
Operating expenses:
Research and development	10,412	7,373
Selling, general and administrative	11,013	9,324
Total operating expenses	21,425	16,697
Operating loss	(25,896)	(20,481)
Interest and other expense, net	(11,583)	(8,345)
Change in fair value of common stock warrant liability		(2,126)
Loss before income taxes	(37,479)	(30,952)
Net loss attributable to the Company	(37,479)	(30,952)
Preferred stock dividends declared and accretion of discount	(13)	(52)
Net loss attributable to common stockholders	$ (37,492)	$ (31,004)
Net loss per share:
Basic and diluted	$ (0.12)	$ (0.14)
Weighted average number of common stock outstanding	305,192,201	220,605,068
Sales of fuel cell systems and related infrastructure
Net revenue:
Net revenue	$ 20,387	$ 2,544
Cost of revenue:
Total cost of revenue	13,744	2,321
Services performed on fuel cell systems and related infrastructure
Net revenue:
Net revenue	6,521	6,343
Cost of revenue:
Total cost of revenue	8,181	6,123
Power Purchase Agreements
Net revenue:
Net revenue	6,496	6,110
Cost of revenue:
Total cost of revenue	14,243	8,998
Fuel delivered to customers
Net revenue:
Net revenue	7,333	6,582
Cost of revenue:
Total cost of revenue	9,035	$ 7,921
Other
Net revenue:
Net revenue	76
Cost of revenue:
Total cost of revenue	$ 81