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Restatement of Previously Issued Consolidated Financial Statements - Research and development expense (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Research and Development Expense		$ 7,386	$ 4,873	$ 4,774	$ 4,882	$ 3,563	$ 3,608	$ 3,006	$ 9,647	$ 6,614	$ 17,033	$ 10,177	$ 27,848	$ 15,059	$ 12,750
Gross Profit	$ (431,114)	(28,584)	(15)	(9,703)	7,746	4,500	6,142	(7,740)	(9,718)	(1,598)	(38,302)	2,902	$ (469,416)	10,648	(26,004)
Restatement Adjustments
Cost of Revenue														19,492	21,157
Research and Development Expense		(4,578)	(4,884)	(5,638)	(4,459)	(4,465)	(5,325)	(4,367)	(10,522)	(9,692)	(15,100)	(14,157)		(18,616)	(21,157)
Gross Profit		$ (27,294)	$ (5,091)	$ (5,232)	$ (5,036)	$ (3,847)	$ (4,479)	$ (3,956)	$ (10,323)	$ (8,435)	$ (37,617)	$ (12,282)		(17,318)	(28,626)
Restatement Adjustments | Sales of fuel cell systems and related infrastructure
Cost of Revenue														1,121	614
Restatement Adjustments | Services performed on fuel cell systems and related infrastructure
Cost of Revenue														6,986	7,954
Restatement Adjustments | Power Purchase Agreements
Cost of Revenue														2,539	4,264
Revision of Research and Development Expense | Restatement Adjustments
Research and Development Expense														$ (19,492)	$ (21,157)

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