Unaudited Quarterly Financial data and Restatement of Previously Issued Unaudited Interim Condensed Consolidated Financial Statements - Additional Information (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
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Long-term Line of Credit	$ 175,400												$ 175,400
Operating lease liabilities	14,314	$ 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	99,624	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	32,717	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	148,836	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	29,487	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
Equipment related to power purchase agreements and fuel delivered to customers, net	75,807	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
Other liabilities	40,447	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
Operating Lease, Liability	113,938												113,938
Accounts receivable	43,041	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
Inventory, Net	139,386	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	44,324	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	72,387	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
Right of use assets related to operating leases, net	117,016	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
Intangible assets, net	39,251	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
Accrued expenses	46,083	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	32,944	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
Other assets	5,513	9,661	11,817	12,059	8,573	9,152	8,842	11,069	11,817	8,842	9,661	9,152	5,513	8,573
Accounts payable	50,198	58,793	39,812	35,503	40,376	36,851	36,946	31,688	39,812	36,946	58,793	36,851	50,198	40,376
Convertible senior notes, net	85,640	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	3,446,650	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	2,451	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 For Cost Of Goods And Services Sold		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
Provision for Loss Contracts on Services								162
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)
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
Income tax benefit		6,644	17,371						17,371		24,015		30,845		9,295
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
Change in fair value of contingent consideration		1,130									1,130		1,160
Net cash used in operating activities				(60,402)				(35,699)	(111,891)	(48,328)	(156,506)	(54,141)	(155,476)	(53,324)	(58,350)
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
Recognition of right of use assets				340				2,000	6,836	11,689	25,857	29,903	55,651	52,924	41,679
Conversion of convertible notes to common stock													62,553
Repayments of finance obligations				5,343				53,580	11,129	55,712	19,038	56,603	27,212	59,196	30,531
Accumulated deficit	(1,946,488)	(1,462,377)	(1,397,160)	(1,387,752)	(1,350,307)	(1,332,259)	(1,314,425)	(1,297,072)	(1,397,160)	(1,314,425)	(1,462,377)	(1,332,259)	(1,946,488)	(1,350,307)
Bonus Accrual
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other Labor-related Expenses		5,300
Accrued expenses		5,300									5,300
Revision of lease right of use assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other Labor-related Expenses		2,400
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)
Equipment related to power purchase agreements and fuel delivered to customers, net		535									535
Right of use assets related to operating leases, net		(145,600)									(145,600)
Net cash provided by financing activities											(404)
Recognition of right of use assets												(48,700)
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 Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Research and development														19,500	21,200
As previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
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
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
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
Inventory, Net		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
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
Other assets		9,661	11,817	12,059	8,573	9,152	8,842	11,069	11,817	8,842	9,661	9,152		8,573
Accounts payable		58,793	39,812	35,503	40,376	36,851	36,946	31,688	39,812	36,946	58,793	36,851		40,376
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 For Cost Of Goods And Services Sold		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
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)
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
Income tax benefit		6,523	17,659						17,659		24,182				9,217
Preferred stock dividends declared, deemed dividends and accretion of discount			13	13	13	13	13	52	19	26	19	39		52	52
Net cash used in operating activities				(60,015)				(36,263)	(111,247)	(48,488)	(156,910)	(51,801)		(51,522)	(57,617)
Net cash provided by financing activities				4,083				37,650	181,565	80,026	590,587	149,055		325,060	119,344
Recognition of right of use assets				6,189					26,922	34,530	56,377	78,626		127,370	79,057
Repayments of finance obligations				5,730				53,534	11,783	56,070	18,634	59,461		61,713	31,264
Accumulated deficit		(1,431,340)	(1,391,961)	(1,383,299)	(1,345,807)	(1,327,518)	(1,309,363)	(1,291,255)	(1,391,961)	(1,309,363)	(1,431,340)	(1,327,518)		(1,345,807)
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 finance leases		235,800	204,700	183,400		133,700	100,300	69,700
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 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
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)
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)
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
Inventory, Net		(103)									(103)
Goodwill		(140)	(140)						(140)		(140)
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
Intangible assets, net		400	400	400					400		400
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 For Cost Of Goods And Services Sold		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
Interest and other expense, net		(310)	(264)	(263)	(193)	(301)	(104)	(109)	(527)	(213)	(837)	(514)		(189)	(615)
Selling, general and administrative		2,933	(14)	96	(1,009)	(5)	(14)	(103)	82	(117)	3,015	(122)		(1,131)	(513)
Income tax benefit		121	(288)						(288)		(167)				78
Preferred stock dividends declared, deemed dividends and accretion of discount					1,228	531		(39)	7		7	531		1,760
Change in fair value of contingent consideration		1,130									1,130
Net cash used in operating activities				(387)				564	(644)	160	404	(2,340)		(1,802)	(733)
Net cash provided by financing activities				387				(564)	654	(160)	(404)	2,340		1,914	733
Recognition of right of use assets				(5,849)				2,000	(20,086)	(22,841)	(30,520)	(48,723)		(74,446)	(37,378)
Repayments of finance obligations				(387)				46	(654)	(358)	404	(2,858)		(2,517)	(733)
Accumulated deficit		(31,037)	(5,199)	(4,453)	(4,500)	(4,741)	(5,062)	(5,817)	(5,199)	(5,062)	(31,037)	(4,741)		(4,500)
Restatement Adjustments | Bonus Accrual
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Research and development		872									872
Selling, general and administrative		2,900									2,900
Net cash used in operating activities											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
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)
Equipment related to power purchase agreements and fuel delivered to customers, net			837	725		655	543	432	837	543		655
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)
Provision For Cost Of Goods And Services Sold															937
Interest and other expense, net		310	264	262					527		(837)	514		522	615
Selling, general and administrative		(56)	(14)	96		(5)	(14)	3	82	(117)	(138)	(122)		25
Net revenue														(747)
Net cash used in operating activities				(282)				(12)	(553)	(492)	591	(3,100)		2,700	818
Net cash provided by financing activities				387				(46)	(222)	358		2,900		2,500	733
Recognition of right of use assets				(5,800)				2,000		(22,800)	(30,500)				37,400
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
Net revenue														1,200
Net cash used in operating activities				(128)				(142)	277	(873)	20,800			(1,600)	5,300
Recognition of right of use assets									(20,100)					74,400
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 For Cost Of Goods And Services Sold														1,100
Restatement Adjustments | Revision of Contingent Consideration
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value of contingent consideration		1,100									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 | 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
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
Inventory, Net		103									103
Goodwill		140	(140)						(140)		140
Intangible assets, net		400	400	400					400		400
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
Interest and other expense, net														185
Selling, general and administrative					(1)			(106)						1,100	513
Income tax benefit		121	288						288		167				78
Preferred stock dividends declared, deemed dividends and accretion of discount									(7)		7
Net cash used in operating activities				(24)				312	330	364	226	600		906	597
Net cash provided by financing activities								(518)		(518)		(518)		603
Conversion of convertible notes to common stock											185
Other Adjustments | Revision to Interest Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other expense, net														518
Provision (benefit) for loss contracts related to service
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		25,147	706	95	13	206	363	162	801	201	25,948	407	35,473	394	5,345
Provision (benefit) for loss contracts related to service | As previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		4,306									4,306
Provision (benefit) for loss contracts related to service | Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		20,841	706	95	13	206	363	162	801	201	21,642	407		394	5,345
Sales of fuel cell systems, related infrastructure and equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Net revenue	(246,171)	83,662	47,746	20,468	69,785	38,883	38,702	2,550	68,214	41,252	151,876	80,135	(94,295)	149,920	107,175
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 For Cost Of Goods And Services Sold														7,000
Sales of fuel cell systems, related infrastructure and equipment | As previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Net revenue		83,528	47,746	20,387	69,767	38,877	38,696	2,544	68,133	41,240	151,661	80,117		149,884	107,292
Sales of fuel cell systems, related infrastructure and equipment | Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		919	212	230	672	193	200	(9)	442	191	1,361	384		1,056	766
Net revenue		134		81	18	6	6	6	81	12	215	18		36	(117)
Sales of fuel cell systems, related infrastructure and equipment | Restatement Adjustments | Bonus Accrual
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		584									584
Sales of fuel cell systems, related infrastructure and equipment | Restatement Adjustments | Revision of Loss of Accrual Provision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold											(839)
Sales of fuel cell systems, related infrastructure and equipment | Restatement Adjustments | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		232	212	230	585	193	200	143	442	343	674	384			614
Sales of fuel cell systems, related infrastructure and equipment | Other Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		103			87			(152)		(152)	103			(65)	152
Net revenue		134	81		18	6		6	81	12	215	18		36	117
Fuel delivered to customers
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Net revenue	(40,608)	9,831	7,372	7,333	7,779	7,649	7,089	6,582	14,705	13,671	24,536	21,320	(16,072)	29,099	22,469
Fuel delivered to customers | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold														8,900
Fuel delivered to customers | As previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Net revenue		9,831	7,372	7,333	7,779	7,649	7,089	6,582	14,705	13,671	24,536	21,320		29,099	22,469
Fuel delivered to customers | Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Fuel delivered to customers | Restatement Adjustments | Bonus Accrual
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		56									56
Fuel delivered to customers | Restatement Adjustments | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		2,800	2,000	2,200	2,300	2,000	2,300	2,200	4,200	4,500	7,000	6,500			8,300
Fuel delivered to customers | Other Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold					44									44
Services performed on fuel cell systems and related infrastructure
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Net revenue	(29,387)	6,829	6,236	6,521	7,328	6,205	5,341	6,343	12,757	11,684	19,586	17,889	(9,801)	25,217	22,002
Services performed on fuel cell systems and related infrastructure | As previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Net revenue		6,829	6,236	6,521	7,328	6,205	5,341	6,343	12,757	11,684	19,586	17,889		25,217	22,002
Services performed on fuel cell systems and related infrastructure | Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Services performed on fuel cell systems and related infrastructure | Restatement Adjustments | Bonus Accrual
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		930									931
Services performed on fuel cell systems and related infrastructure | Restatement Adjustments | Revision of Loss of Accrual Provision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		315	(315)	(224)	(289)	(288)	369		(524)	(672)		(960)
Services performed on fuel cell systems and related infrastructure | Restatement Adjustments | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Services performed on fuel cell systems and related infrastructure | Other Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold					44									44	619
Power Purchase Agreements
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Net revenue	$ 6,991	6,629	6,579	6,421	6,664	6,520	6,334	6,035	13,000	12,369	19,629	18,889	$ 26,620	25,553	22,569
Power Purchase Agreements | As previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		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
Net revenue		6,704	6,654	6,496	6,739	6,595	6,409	6,110	13,150	12,519	19,854	19,114		25,853	22,869
Power Purchase Agreements | Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		657	800	528	309	461	116	835	1,328	951	1,985	1,412		1,721	5,200
Net revenue		(75)	(75)	(75)	(75)	(75)	(75)	(75)	(150)	(150)	(225)	(225)		(300)	(300)
Power Purchase Agreements | Restatement Adjustments | Revision of lease right of use assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		(280)	(255)	(253)	(237)	(175)		(167)	(508)	(335)	(788)	(150)
Net revenue							(165)
Power Purchase Agreements | Restatement Adjustments | Revision of Research and Development Expense
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		955	1,100	$ 799	564	654	299	1,000	1,900	1,300	2,800	2,000			4,200
Power Purchase Agreements | Other Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision For Cost Of Goods And Services Sold		(18)	(18)		(18)	(18)		(18)	(36)	(35)	(54)	(53)		(70)
Net revenue		$ (75)	$ (75)		$ (75)	(75)		(75)	$ (150)	(150)	$ (225)	(225)		$ (300)	$ 300
ASU 2019-08 | As previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Additional Paid in Capital						(6,500)	3,500			3,500		(6,500)
Accumulated deficit						$ 6,500	$ 3,500			$ 3,500		$ 6,500
ASU 2019-08 | Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Additional Paid in Capital								(3,000)
Accumulated deficit								$ 3,000