Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net revenue:
Net revenue	$ 91,664	$ 59,461	$ 57,535	$ 21,579	$ 59,820	$ 53,165	$ 35,229	$ 26,418
Gross (loss) profit	12,782	8,349	10,619	(3,784)	4,507	4,409	(2,310)	(3,984)	$ 27,966	$ 2,622	$ (28,089)
Operating expenses	20,323	18,428	22,560	16,697	17,426	17,054	20,668	16,957	78,008	72,105	73,703
Operating loss	(7,541)	(10,079)	(11,941)	(20,481)	(12,919)	(12,645)	(22,978)	(20,941)	(50,042)	(69,483)	(101,792)
Net loss attributable to common shareholders	$ (18,288)	$ (18,155)	$ (18,070)	$ (31,004)	$ (16,860)	$ (15,578)	$ (25,881)	$ (19,848)	$ (85,517)	$ (78,167)	$ (130,178)
Loss per share:
Basic and diluted	$ (0.07)	$ (0.08)	$ (0.07)	$ (0.14)	$ (0.08)	$ (0.07)	$ (0.12)	$ (0.09)	$ (0.36)	$ (0.36)	$ (0.60)
Sales of fuel cell systems and related infrastructure
Net revenue:
Net revenue	$ 69,767	$ 38,877	$ 38,696	$ 2,544	$ 41,191	$ 36,668	$ 18,820	$ 10,613	$ 149,884	$ 107,292	$ 62,631
Services performed on fuel cell systems and related infrastructure
Net revenue:
Net revenue	7,328	6,205	5,341	6,343	5,672	5,156	5,691	5,483	25,217	22,002	16,202
Power Purchase Agreements
Net revenue:
Net revenue	6,739	6,595	6,409	6,110	6,504	5,555	5,438	5,372	25,853	22,869	12,869
Fuel delivered to customers
Net revenue:
Net revenue	7,779	7,649	$ 7,089	$ 6,582	$ 6,453	$ 5,786	$ 5,280	$ 4,950	29,099	$ 22,469	8,167
Other
Net revenue:
Net revenue	$ 51	$ 135							$ 186		$ 284

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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