Restatement of Previously Issued Consolidated Financial Statements - (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	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
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Right of use assets related to operating leases, net	$ 90,184	$ 71,789	$ 64,812	$ 63,266	$ 47,016	$ 39,679	$ 33,599	$ 71,789	$ 39,679	$ 90,184	$ 47,016	$ 117,016	$ 63,266
Equipment related to power purchase agreements and fuel delivered to customers, net	71,891	68,428	68,402	67,769	67,248	68,982	70,928	68,428	68,982	71,891	67,248	75,807	67,769
Operating lease liabilities	10,609	9,453	8,959	9,428	8,666	7,512	7,042	9,453	7,512	10,609	8,666	14,314	9,428
Operating lease liabilities	74,422	58,410	52,165	50,937	36,599	30,631	25,657	58,410	30,631	74,422	36,599	99,624	50,937
Finance obligations	31,349	28,794	26,209	24,667	20,469	12,455	11,028	28,794	12,455	31,349	20,469	32,717	24,667
Finance obligations	140,662	131,653	121,322	119,422	99,669	76,916	54,864	131,653	76,916	140,662	99,669	148,836	119,422
Other current liabilities	21,083	19,418	8,446	6,704	8,373	3,705	3,745	19,418	3,705	21,083	8,373	29,487	6,704
Other liabilities	45,170	14,476	2,386	2,818	2,834	3,333	3,746	14,476	3,333	45,170	2,834	40,447	2,818
Accounts receivable	113,505	45,782	24,734	25,768	24,737	26,844	32,307	45,782	26,844	113,505	24,737	43,041	25,768
Accrued expenses	37,948	23,917	14,870	14,409	9,457	4,522	6,509	23,917	4,522	37,948	9,457	46,083	14,409
Deferred revenue	29,511	24,848	22,684	23,170	22,213	24,126	25,366	24,848	24,126	29,511	22,213	32,944	23,170
Convertible senior notes, net	105,088	142,889	113,063	110,431	107,945	66,844	65,025	142,889	66,844	105,088	107,945	85,640	110,431
Additional paid-in capital	2,083,169	1,658,438	1,519,094	1,506,953	1,340,781	1,325,381	1,316,815	1,658,438	1,325,381	2,083,169	1,340,781	3,446,650	1,506,953
Accumulated other comprehensive income	1,846	1,159	1,052	1,288	929	1,460	1,374	1,159	1,460	1,846	929	2,451	1,288
Research and development	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
Provision (benefit) for loss contracts related to service	135,632	68,010	50,522	83,861	54,892	51,324	29,250	118,532	80,574	254,164	135,466	376,179	219,327	200,219
Right of use assets related to finance leases, net	2,335	2,389	1,707	1,714	1,720	1,726	1,733	2,389	1,726	2,335	1,720	5,724	1,714
Inventory	134,203	114,571	92,972	72,391	80,601	73,190	65,474	114,571	73,190	134,203	80,601	139,386	72,391
Prepaid expenses and other current assets	26,731	31,436	28,500	21,192	12,804	14,001	10,296	31,436	14,001	26,731	12,804	44,324	21,192
Goodwill	71,822	70,262	8,673	8,842	8,606	8,961	8,886	70,262	8,961	71,822	8,606	72,387	8,842
Intangible assets, net	39,569	38,974	5,696	5,539	5,113	5,398	3,677	38,974	5,398	39,569	5,113	39,251	5,539
Selling, general and administrative	17,210	21,644	11,109	9,973	10,395	13,613	9,221	32,753	22,834	49,963	33,229	79,348	43,202	37,685
Loss on extinguishment of debt		13,222			(518)		(518)	13,222	(518)	13,222	(518)	17,686	(518)
Provision for Loss Contracts on Services							162
Preferred stock dividends declared, deemed dividends and accretion of discount		13	13	1,241	544	13	13	26	26	26	570	26	1,812	52
Interest and other expense, net	(17,551)	(13,462)	(11,846)	(10,999)	(8,273)	(7,965)	(8,454)	(25,308)	(16,419)	(42,859)	(24,692)	(60,484)	(35,691)	(22,750)
Income tax benefit	6,644	17,371						17,371		24,015		30,845		9,295
Effect of exchange rate changes on cash			1				(35)	(24)	(48)	(90)	(119)	65	(59)	(57)
Right of use assets obtained in exchange for new operating lease liabilities												58,500	37,700
Finance Lease, Liability												5,396
Recognition of right of use assets			340				2,000	6,836	11,689	25,857	29,903	55,651	52,924	41,679
Net cash provided by financing activities			4,470				37,086	182,219	79,866	590,183	151,395	1,515,529	326,974	120,077
Net cash used in operating activities			60,402				35,699	111,891	48,328	156,506	54,141	155,476	53,324	58,350
Repayments of finance obligations			(5,343)				(53,580)	(11,129)	(55,712)	(19,038)	(56,603)	(27,212)	(59,196)	(30,531)
Revision of Lease Liability
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Right of use assets related to operating leases, net				112,700									112,700
Revision of Loss of Accrual Provision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current liabilities	6,400									6,400
Other liabilities	18,100									18,100
Net cash used in operating activities											1,400
Revision of lease right of use assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Right of use assets related to operating leases, net	(145,600)									(145,600)
Equipment related to power purchase agreements and fuel delivered to customers, net	535									535
Operating lease liabilities	(22,100)									(22,100)
Operating lease liabilities	(120,600)									(120,600)
Finance obligations	788									788
Finance obligations	1,000									1,000
Other current liabilities	(2,600)									(2,600)
Recognition of right of use assets											(48,700)
Net cash provided by financing activities										(404)
Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Research and development													19,500	21,200
Provision (benefit) for loss contracts related to service
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	25,147	706	95	13	206	363	162	801	201	25,948	407	35,473	394	5,345
Sales of fuel cell systems, related infrastructure and equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	69,428	33,888	13,974	47,091	25,183	23,329	2,312	47,862	25,641	117,290	50,824	171,404	97,915	85,205
Sales of fuel cell systems, related infrastructure and equipment | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service													7,000
Fuel delivered to customers
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	17,002	11,076	11,254	12,800	11,149	11,146	10,152	22,330	21,298	39,332	32,447	61,815	45,247	36,037
Fuel delivered to customers | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service													8,900
Services performed on fuel cell systems and related infrastructure
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	9,180	7,773	10,347	11,606	7,802	8,383	6,791	18,120	15,174	27,300	22,976	42,524	34,582	32,271
Provision for Loss Contracts on Services							303
Power Purchase Agreements
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	14,744	14,504	14,771	12,301	10,814	8,829	9,833	29,275	18,662	44,019	29,476	$ 64,640	41,777	41,361
Series E Redeemable Convertible Preferred Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Dividends, Preferred Stock													1,800
As previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equipment related to power purchase agreements and fuel delivered to customers, net	309,475	274,721	252,802	244,740	202,034	170,455	141,889	274,721	170,455	309,475	202,034		244,740
Finance obligations	63,692	57,695	52,047	49,507	41,112	30,663	23,997	57,695	30,663	63,692	41,112		49,507
Finance obligations	337,150	300,653	272,171	265,228	208,465	157,531	111,195	300,653	157,531	337,150	208,465		265,228
Other current liabilities	17,280	21,692	10,423	8,543	10,238	3,017	2,271	21,692	3,017	17,280	10,238		8,543
Other liabilities	27,068	11,756	13	13	13	13	17	11,756	13	27,068	13		13
Accounts receivable	113,133	45,522	24,437	25,448	24,392	26,592	32,062	45,522	26,592	113,133	24,392		25,448
Accrued expenses	32,031	23,320	14,273	14,213	9,457	4,522	6,509	23,320	4,522	32,031	9,457		14,213
Deferred revenue	29,648	25,038	22,912	23,369	22,444	24,519	25,835	25,038	24,519	29,648	22,444		23,369
Convertible senior notes, net	105,088	142,704	112,878	110,246	107,760	66,844	65,025	142,704	66,844	105,088	107,760		110,246
Additional paid-in capital	2,083,199	1,658,532	1,519,257	1,507,116	1,340,859	1,325,459	1,316,893	1,658,532	1,325,459	2,083,199	1,340,859		1,507,116
Accumulated other comprehensive income	1,958	1,271	1,164	1,400	929	1,460	1,374	1,271	1,460	1,958	929		1,400
Research and development	11,964	9,757	10,412	9,341	8,028	8,933	7,373	20,169	16,306	32,133	24,334		33,675	33,907
Provision (benefit) for loss contracts related to service	108,279	62,994	45,284	78,882	51,114	46,914	25,363	108,278	72,277	216,557	123,391		202,273	172,010
Inventory	134,306	114,571	92,972	72,391	80,601	73,190	65,474	114,571	73,190	134,306	80,601		72,391
Prepaid expenses and other current assets	26,731	31,436	28,500	21,192	12,804	14,001	10,296	31,436	14,001	26,731	12,804		21,192
Goodwill	71,962	70,402	8,673	8,842	8,606	8,961	8,886	70,402	8,961	71,962	8,606		8,842
Intangible assets, net	39,169	38,574	5,296	5,539	5,113	5,398	3,677	38,574	5,398	39,169	5,113		5,539
Selling, general and administrative	14,277	21,658	11,013	10,982	10,400	13,627	9,324	32,671	22,951	46,948	33,351		44,333	38,198
Loss on extinguishment of debt		13,222			(518)			13,222		13,222	(518)
Preferred stock dividends declared, deemed dividends and accretion of discount		13	13	13	13	13	52	19	26	19	39		52	52
Interest and other expense, net	(17,241)	(13,198)	(11,583)	(10,806)	(7,972)	(7,861)	(8,345)	(24,781)	(16,206)	(42,022)	(24,178)		(35,502)	(22,135)
Income tax benefit	6,523	17,659						17,659		24,182				9,217
Effect of exchange rate changes on cash			1				(35)	(14)	(48)	(90)	(119)		53	(57)
Recognition of right of use assets			6,189					26,922	34,530	56,377	78,626		127,370	79,057
Net cash provided by financing activities			4,083				37,650	181,565	80,026	590,587	149,055		325,060	119,344
Net cash used in operating activities			60,015				36,263	111,247	48,488	156,910	51,801		51,522	57,617
Repayments of finance obligations			(5,730)				(53,534)	(11,783)	(56,070)	(18,634)	(59,461)		(61,713)	(31,264)
As previously Reported | Provision (benefit) for loss contracts related to service
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	4,306									4,306
As previously Reported | Sales of fuel cell systems, related infrastructure and equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	68,509	33,676	13,744	46,419	24,990	23,129	2,321	47,420	25,450	115,929	50,440		96,859	84,439
As previously Reported | Fuel delivered to customers
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	14,172	9,060	9,035	10,422	9,160	8,854	7,921	18,095	16,775	32,267	25,935		36,357	27,712
As previously Reported | Services performed on fuel cell systems and related infrastructure
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	7,074	6,491	8,181	9,999	6,461	6,218	6,123	14,672	12,341	21,746	18,802		28,801	23,698
As previously Reported | Power Purchase Agreements
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	14,087	13,704	14,243	11,992	10,353	8,713	8,998	27,947	17,711	42,034	28,064		40,056	36,161
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassified from equipment related to power purchase agreements and fuel delivered to customers related to operating leases	2,300	2,400	1,700		1,700	1,700	1,700
Reclassified from equipment related to power purchase agreements and fuel delivered to customers related to finance leases	235,800	204,700	183,400		133,700	100,300	69,700
Reclassified from current finance obligations to current operating lease liabilities	32,700	29,500	26,600		21,100	16,600	13,100						25,800
Reclassified from non-current finance obligations to non-current operating lease liabilities	195,100	169,000	151,000		109,300	80,600	54,200						145,500
Reclassified from current finance obligations to current finance lease liabilities	374,000	345	204		310	266	236						226
Reclassified from non-current finance obligations to non-current finance lease liabilities	2,400	2,400	1,900		2,100	2,100	2,100						2,000
Right of use assets related to operating leases, net	90,184	71,789	64,812	63,266	47,016	39,679	33,599	71,789	39,679	90,184	47,016		63,266
Equipment related to power purchase agreements and fuel delivered to customers, net	(237,584)	(206,293)	(184,400)	(176,971)	(134,786)	(101,473)	(70,961)	(206,293)	(101,473)	(237,584)	(134,786)		(176,971)
Operating lease liabilities	10,609	9,453	8,959	9,428	8,666	7,512	7,042	9,453	7,512	10,609	8,666		9,428
Operating lease liabilities	74,422	58,410	52,165	50,937	36,599	30,631	25,657	58,410	30,631	74,422	36,599		50,937
Finance obligations	(32,343)	(28,901)	(25,838)	(24,840)	(20,643)	(18,208)	(12,969)	(28,901)	(18,208)	(32,343)	(20,643)		(24,840)
Finance obligations	(196,488)	(169,000)	(150,849)	(145,806)	(108,796)	(80,615)	(56,331)	(169,000)	(80,615)	(196,488)	(108,796)		(145,806)
Other current liabilities	3,803	(2,274)	(1,977)	(1,839)	(1,865)	688	1,474	(2,274)	688	3,803	(1,865)		(1,839)
Other liabilities	18,102	2,720	2,373	2,805	2,821	3,320	3,729	2,720	3,320	18,102	2,821		2,805
Accounts receivable	372	260	297	320	345	252	245	260	252	372	345		320
Accrued expenses	5,917	597	597	196				597		5,917			196
Deferred revenue	(137)	(190)	(228)	(199)	(231)	(393)	(469)	(190)	(393)	(137)	(231)		(199)
Convertible senior notes, net		185	185	185	185			185			185		185
Additional paid-in capital	(30)	(94)	(163)	(163)	(78)	(78)	(78)	(94)	(78)	(30)	(78)		(163)
Accumulated other comprehensive income	(112)	(112)	(112)	(112)				(112)		(112)			(112)
Research and development	(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)
Provision (benefit) for loss contracts related to service	27,353	5,016	5,238	4,979	3,778	4,410	3,887	10,254	8,297	37,607	12,075		17,054	28,209
Right of use assets related to finance leases, net	2,335	2,389	1,707	1,714	1,720	1,726	1,733	2,389	1,726	2,335	1,720		1,714
Inventory	(103)									(103)
Goodwill	(140)	(140)						(140)		(140)
Intangible assets, net	400	400	400					400		400
Selling, general and administrative	2,933	(14)	96	(1,009)	(5)	(14)	(103)	82	(117)	3,015	(122)		(1,131)	(513)
Loss on extinguishment of debt							(518)		(518)		(518)		(518)
Preferred stock dividends declared, deemed dividends and accretion of discount				1,228	531		(39)	7		7	531		1,760
Interest and other expense, net	(310)	(264)	(263)	(193)	(301)	(104)	(109)	(527)	(213)	(837)	(514)		(189)	(615)
Income tax benefit	121	(288)						(288)		(167)				78
Effect of exchange rate changes on cash								(10)					(112)
Recognition of right of use assets			(5,849)				2,000	(20,086)	(22,841)	(30,520)	(48,723)		(74,446)	(37,378)
Net cash provided by financing activities			387				(564)	654	(160)	(404)	2,340		1,914	733
Net cash used in operating activities			387				(564)	644	(160)	(404)	2,340		1,802	733
Repayments of finance obligations			387				(46)	654	358	(404)	2,858		2,517	733
Restatement Adjustments | Revision of Loss of Accrual Provision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current liabilities		1,300	1,200	897	1,200	1,200	1,500	1,300	1,200		1,200		897
Other liabilities		2,700	2,400	2,800	2,800	3,300	3,700	2,700	3,300		2,800		2,800
Provision for Loss Contracts on Services	20,800	706	95	13	(206)	(363)		801	(201)	21,600	(407)		394	5,300
Recognition of right of use assets								(20,100)					74,400
Net cash used in operating activities			128				142	(277)	873	(20,800)			1,600	(5,300)
Restatement Adjustments | Revision of lease right of use assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassified from equipment related to power purchase agreements and fuel delivered to customers related to operating leases													767
Reclassified from non-current finance obligations to non-current finance lease liabilities													1,700
Right of use assets related to operating leases, net		(132,900)	(118,600)	(112,700)	(86,700)	(60,600)	(36,100)	(132,900)	(60,600)		(86,700)		(112,700)
Equipment related to power purchase agreements and fuel delivered to customers, net		837	725		655	543	432	837	543		655
Operating lease liabilities		(20,100)	(17,700)	(16,400)	(12,400)	(9,100)	(6,100)	(20,100)	(9,100)		(12,400)		(16,400)
Operating lease liabilities		(110,600)	(99,000)	(94,600)	(72,700)	(50,000)	(28,600)	(110,600)	(50,000)		(72,700)		(94,600)
Finance obligations		898	1,000	1,200	752	(1,400)	360,000	898	(1,400)		752		1,200
Finance obligations		2,400	2,000	1,700	2,600	2,200	19	2,400	2,200		2,600		1,700
Other current liabilities		(3,500)	(3,200)	(2,700)	(3,000)	(464)		(3,500)	(464)		(3,000)		(2,700)
Provision (benefit) for loss contracts related to service														937
Selling, general and administrative	(56)	(14)	96		(5)	(14)	3	82	(117)	(138)	(122)		25
Interest and other expense, net	310	264	262					527		(837)	514		522	615
Recognition of right of use assets			(5,800)				2,000		(22,800)	(30,500)				37,400
Net cash provided by financing activities			387				(46)	(222)	358		2,900		2,500	733
Net cash used in operating activities			282				12	553	492	(591)	3,100		(2,700)	(818)
Restatement Adjustments | Revision of Deemed Dividend
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Preferred stock dividends declared, deemed dividends and accretion of discount				1,300	531		(39)				531
Restatement Adjustments | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Research and development	(5,500)	(4,900)	(5,600)	(5,300)	(4,500)	(5,300)	(4,400)	(10,500)	(9,700)	(15,900)	(14,200)		(19,492)	(21,157)
Provision (benefit) for loss contracts related to service													1,100
Restatement Adjustments | Revision to Interest Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other expense, net				193	301	104	109		213
Restatement Adjustments | Power Purchase Agreements
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassified from equipment related to power purchase agreements and fuel delivered to customers related to operating leases													176,000
Reclassified from equipment related to power purchase agreements and fuel delivered to customers related to finance leases													1,700
Restatement Adjustments | Provision (benefit) for loss contracts related to service
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	20,841	706	95	13	206	363	162	801	201	21,642	407		394	5,345
Restatement Adjustments | Sales of fuel cell systems, related infrastructure and equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	919	212	230	672	193	200	(9)	442	191	1,361	384		1,056	766
Restatement Adjustments | Sales of fuel cell systems, related infrastructure and equipment | Revision of Loss of Accrual Provision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service										(839)
Restatement Adjustments | Sales of fuel cell systems, related infrastructure and equipment | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	232	212	230	585	193	200	143	442	343	674	384			614
Restatement Adjustments | Fuel delivered to customers
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	2,830	2,016	2,219	2,378	1,989	2,292	2,231	4,235	4,523	7,065	6,512		8,890	8,325
Restatement Adjustments | Fuel delivered to customers | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	2,800	2,000	2,200	2,300	2,000	2,300	2,200	4,200	4,500	7,000	6,500			8,300
Restatement Adjustments | Services performed on fuel cell systems and related infrastructure
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	2,106	1,282	2,166	1,607	1,341	2,165	668	3,448	2,833	5,554	4,174		5,781	8,573
Restatement Adjustments | Services performed on fuel cell systems and related infrastructure | Revision of Loss of Accrual Provision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	315	(315)	(224)	(289)	(288)	369		(524)	(672)		(960)
Restatement Adjustments | Services performed on fuel cell systems and related infrastructure | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	1,500	1,600	2,400	1,900	1,600	2,500	971	4,000	3,500	5,500	5,100		2,500	8,000
Restatement Adjustments | Power Purchase Agreements
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	657	800	528	309	461	116	835	1,328	951	1,985	1,412		1,721	5,200
Restatement Adjustments | Power Purchase Agreements | Revision of lease right of use assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	(280)	(255)	(253)	(237)	(175)		(167)	(508)	(335)	(788)	(150)
Restatement Adjustments | Power Purchase Agreements | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	955	1,100	799	564	654	299	1,000	1,900	1,300	2,800	2,000			4,200
Restatement Adjustments | Series E Redeemable Convertible Preferred Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Dividends, Preferred Stock													1,800
Other Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable	372	260	297	320	345	252	245	260	252	372	345		320
Accrued expenses	703	597	597	196				597		703			196
Deferred revenue	137	(190)	(228)	199	(231)	(393)	(469)	(190)	(393)	137	(231)		199
Convertible senior notes, net		185	185	185	185			185			185		185
Additional paid-in capital	30	(94)	(163)	163	78	$ (78)	(78)	(94)	(78)	30	78		163	78
Accumulated other comprehensive income	112	(112)	(112)	112				(112)		112			112
Research and development				876									876
Inventory	103									103
Goodwill	140	(140)						(140)		140
Intangible assets, net	400	400	400					400		400
Selling, general and administrative				(1)			(106)						1,100	513
Loss on extinguishment of debt													518
Preferred stock dividends declared, deemed dividends and accretion of discount								(7)		7
Interest and other expense, net													185
Income tax benefit	121	288						288		167				78
Effect of exchange rate changes on cash													112
Net cash provided by financing activities							(518)		(518)		(518)		603
Net cash used in operating activities			$ 24				(312)	(330)	(364)	(226)	(600)		(906)	(597)
Other Adjustments | Revision to Interest Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other expense, net													518
Other Adjustments | Sales of fuel cell systems, related infrastructure and equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	103			87			(152)		(152)	103			(65)	152
Other Adjustments | Fuel delivered to customers
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service				44									44
Other Adjustments | Services performed on fuel cell systems and related infrastructure
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service				44									44	$ 619
Other Adjustments | Power Purchase Agreements
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for loss contracts related to service	$ (18)	$ (18)		$ (18)	$ (18)		$ (18)	$ (36)	$ (35)	$ (54)	$ (53)		$ (70)