Unaudited Quarterly Financial data and Restatement of Previously Issued Unaudited interim Condensed Consolidated Financial Statements - Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2020	Aug. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	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
Operating Activities
Net loss attributable to the Company						$ (65,217)	$ (9,401)	$ (37,432)	$ (18,036)	$ (17,822)	$ (17,338)	$ (30,547)	$ (46,833)	$ (47,885)	$ (112,050)	$ (65,707)	$ (596,155)	$ (83,743)	$ (85,608)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of long-lived assets								2,991				2,748	6,069	5,433	9,860	8,858	14,434	11,938	11,832
Amortization of intangible assets								175				175	398	338	835	518	1,135	698	693
Stock-based compensation								3,045				2,497	6,188	5,123	9,258	7,927	17,135	10,890	8,771
(Gain) loss on extinguishment of debt							(13,222)			518		518	(13,222)	518	(13,222)	518	(17,686)	518
Provision for bad debts and other assets												307		907		1,253	700	1,981	1,626
Amortization of debt issuance costs and discount on convertible senior notes								2,716				2,469	6,528	4,340	12,183	6,442	17,061	9,006	6,347
Provision for common stock warrants								2,566				1,193	7,983	2,209	25,198	3,706	425,047	6,513	10,190
Loss on disposal of leased assets														212		212		212
Fair value adjustment to contingent consideration															1,130		(1,160)
Loss (benefit) on service contracts								(128)				(142)	277	(873)	25,110	(1,366)	33,125	(1,643)	5,345
Change in fair value of common stock warrant liability									(72)	(427)	(1,706)	2,126		420		(7)		(79)	(4,286)
Income tax benefit						(6,644)	(17,371)						(17,371)		(24,015)		(30,845)		(9,295)
Changes in operating assets and liabilities that provide (use) cash:
Accounts receivable								1,034				5,001	(18,333)	9,864	(86,056)	11,625	(15,701)	10,594	(14,666)
Inventory								(20,581)				(17,716)	(37,983)	(25,431)	(57,615)	(32,843)	(63,389)	(24,633)	19,193
Prepaid expenses and other assets								(10,794)				1,018	(11,887)	(460)	(4,956)	427	(18,401)	(8,110)	(4,654)
Accounts payable, accrued expenses, and other liabilities								(3,374)				(2,887)	3,903	662	41,125	10,164	51,880	17,234	(10,160)
Deferred revenue								(620)				(2,459)	2,392	(3,705)	16,709	(5,868)	20,914	(4,700)	6,322
Net cash used in operating activities								(60,402)				(35,699)	(111,891)	(48,328)	(156,506)	(54,141)	(155,476)	(53,324)	(58,350)
Investing activities
Purchases of property, plant and equipment								(2,507)				(1,468)	(5,009)	(2,844)	(11,265)	(4,635)	(22,526)	(5,683)	(5,142)
Purchase of intangible assets														(1,860)	(1,638)	(1,860)	(1,957)	(2,404)	(929)
Purchases of equipment related to PPA and equipment related to fuel delivered to customers								(3,848)				(806)	(6,256)	(1,987)	(13,699)	(2,851)	(25,738)	(6,532)	(13,501)
Net cash paid for acquisitions													(45,286)		(45,113)		(45,113)
Proceeds from sale of leased assets														375		375		375
Net cash used in investing activities								(6,355)				(2,274)	(56,551)	(6,316)	(71,715)	(8,971)	(95,334)	(14,244)	(19,572)
Financing activities
Proceeds from issuance of preferred stock, net of transaction costs												(3)		(8)		(37)		14,089	30,934
Proceeds from public offerings, net of transaction costs	$ 927,300	$ 344,400	$ 120,400	$ 23,500								23,498	(269)	28,265	344,398	38,098	1,271,714	158,343	7,195
Proceeds from exercise of stock options								6,104				81	15,798	205	23,335	(116)	32,023	1,217	138
Payments for redemption of preferred stock																(4,040)		(4,040)
Proceeds from issuance of convertible senior notes, net													205,100		205,098	39,052	205,098	39,052	95,856
Repurchase of convertible senior notes													(90,238)		(90,238)		(90,238)
Purchase of capped calls and common stock forward													(16,253)		(16,253)		(16,253)		(43,500)
Proceeds from termination of capped calls													24,158		24,158		24,158
Principal payments on long-term debt								(5,315)				(17,671)	(21,626)	(18,039)	(27,845)	(21,704)	(48,020)	(25,345)	(16,190)
Proceeds from long-term debt, net												84,761	49,000	99,546	99,000	99,496	99,000	119,186
Repayments of finance obligations								(5,343)				(53,580)	(11,129)	(55,712)	(19,038)	(56,603)	(27,212)	(59,196)	(30,531)
Proceeds from finance obligations								9,024					27,678	25,609	47,568	57,249	65,259	83,668	76,175
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
Effect of exchange rate changes on cash								1				(35)	(24)	(48)	(90)	(119)	65	(59)	(57)
Increase in cash, cash equivalents and restricted cash								(62,286)				(922)	13,753	25,174	361,872	88,164	1,264,784	259,347	42,098
Cash, cash equivalents, and restricted cash beginning of period					$ 731,372	383,253	307,214	369,500	198,317	135,327	109,231	110,153	369,500	110,153	369,500	110,153	369,500	110,153	68,055
Cash, cash equivalents, and restricted cash end of period			369,500	109,231	1,634,284	731,372	383,253	307,214	369,500	198,317	135,327	109,231	383,253	135,327	731,372	198,317	1,634,284	369,500	110,153
Supplemental disclosure of cash flow information
Cash paid for interest								5,155				4,858	9,466	8,673	16,975	8,673	28,942	19,180	13,057
Summary of non-cash activity
Recognition of right of use assets								340				2,000	6,836	11,689	25,857	29,903	55,651	52,924	41,679
Net transfers between inventory and long-lived assets																			18,175
Conversion of preferred stock to common stock								441					441		43,058	1,883	1,179	28,392
As previously Reported
Operating Activities
Net loss attributable to the Company						(39,379)	(8,656)	(37,479)	(18,275)	(18,144)	(18,094)	(30,952)	(46,135)	(49,046)	(85,514)	(67,190)		(85,465)	(78,115)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of long-lived assets								2,850				2,776	5,783	5,496	9,381	8,944		11,989	11,014
Amortization of intangible assets								175				175	398	338	835	518		698	693
Stock-based compensation								3,045				2,497	6,188	5,123	9,258	7,927		10,890	8,771
(Gain) loss on extinguishment of debt							(13,222)			518			(13,222)		(13,222)	518
Provision for bad debts and other assets												307		907		1,253		1,981	1,626
Amortization of debt issuance costs and discount on convertible senior notes								2,716				2,469	6,528	4,340	12,183	6,257		8,821	6,347
Provision for common stock warrants								2,566				1,193	7,983	2,209	25,198	3,706		6,513	10,190
Loss on disposal of leased assets														212		212		212
Fair value adjustment to contingent consideration															1,130
Loss (benefit) on service contracts															4,306
Change in fair value of common stock warrant liability						1,130			(72)	(427)	(1,706)	2,126		420	1,130	(7)		(79)	(4,286)
Income tax benefit						(6,523)	(17,659)						(17,659)		(24,182)				(9,217)
Changes in operating assets and liabilities that provide (use) cash:
Accounts receivable								1,011				4,978	(18,393)	9,848	(86,004)	11,702		10,646	(14,398)
Inventory								(20,581)				(17,564)	(37,983)	(25,280)	(57,718)	(32,691)		(24,481)	19,041
Prepaid expenses and other assets								(10,794)				1,018	(11,817)	(460)	(4,956)	427		(8,110)	(4,654)
Accounts payable, accrued expenses, and other liabilities								(2,933)				(2,781)	4,699	1,232	35,748	13,293		19,879	(10,266)
Deferred revenue								(591)				(2,505)	2,383	(3,827)	16,647	(6,152)		(5,016)	5,637
Net cash used in operating activities								(60,015)				(36,263)	(111,247)	(48,488)	(156,910)	(51,801)		(51,522)	(57,617)
Investing activities
Purchases of property, plant and equipment								(2,507)				(1,468)	(5,009)	(2,844)	(11,265)	(4,635)		(5,683)	(5,142)
Purchase of intangible assets														(1,860)	(1,638)	(1,860)		(2,404)	(929)
Purchases of equipment related to PPA and equipment related to fuel delivered to customers								(3,848)				(806)	(6,256)	(1,987)	(13,699)	(2,851)		(6,532)	(13,501)
Net cash paid for acquisitions													(45,286)		(45,113)
Proceeds from sale of leased assets														375		375		375
Net cash used in investing activities								(6,355)				(2,274)	(56,551)	(6,316)	(71,715)	(8,971)		(14,244)	(19,572)
Financing activities
Proceeds from issuance of preferred stock, net of transaction costs												(3)		(8)		(37)		14,089	30,934
Proceeds from public offerings, net of transaction costs												23,498	(269)	28,265	344,398	38,098		158,428	7,195
Proceeds from exercise of stock options								6,104				81	15,798	205	23,335	(116)		1,217	138
Payments for redemption of preferred stock																(4,040)		(4,040)
Proceeds from issuance of convertible senior notes, net													205,100		205,098	39,052		39,052	95,856
Repurchase of convertible senior notes													(90,238)		(90,238)
Purchase of capped calls and common stock forward													(16,253)		(16,253)				(43,500)
Proceeds from termination of capped calls													24,158		24,158
Principal payments on long-term debt								(5,315)				(17,153)	(21,626)	(17,521)	(27,845)	(21,186)		(24,827)	(16,190)
Proceeds from long-term debt, net												84,761	49,000	99,546	99,000	99,496		119,186
Repayments of finance obligations								(5,730)				(53,534)	(11,783)	(56,070)	(18,634)	(59,461)		(61,713)	(31,264)
Proceeds from finance obligations								9,024					27,678	25,609	47,568	57,249		83,668	76,175
Net cash provided by financing activities								4,083				37,650	181,565	80,026	590,587	149,055		325,060	119,344
Effect of exchange rate changes on cash								1				(35)	(14)	(48)	(90)	(119)		53	(57)
Increase in cash, cash equivalents and restricted cash								(62,286)				(922)	13,753	25,174	361,872	88,164		259,347	42,098
Cash, cash equivalents, and restricted cash beginning of period					$ 731,372	383,253	307,214	369,500	198,317	135,327	109,231	110,153	369,500	110,153	369,500	110,153	$ 369,500	110,153	68,055
Cash, cash equivalents, and restricted cash end of period			$ 369,500	$ 109,231		731,372	383,253	307,214	369,500	198,317	135,327	109,231	383,253	135,327	731,372	198,317		369,500	110,153
Supplemental disclosure of cash flow information
Cash paid for interest								5,155				4,858	9,466	8,673	16,975	8,673		19,180	13,057
Summary of non-cash activity
Recognition of right of use assets								6,189					26,922	34,530	56,377	78,626		127,370	79,057
Net transfers between inventory and long-lived assets																			18,175
Conversion of preferred stock to common stock								441					441		42,873	1,883		28,392
Restatement Adjustments
Operating Activities
Net loss attributable to the Company						(25,838)	(745)	47	$ 239	$ 322	$ 756	405	(698)	1,161	(26,536)	1,483		1,722	(7,493)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of long-lived assets								141				(28)	286	(63)	479	(86)		(51)	818
(Gain) loss on extinguishment of debt												518		518		518		518
Amortization of debt issuance costs and discount on convertible senior notes																185		185
Loss (benefit) on service contracts								(128)				(142)	277	(873)	20,804	(1,366)		(1,643)	5,345
Change in fair value of common stock warrant liability						(1,130)									(1,130)
Income tax benefit						(121)	288						288		167				(78)
Changes in operating assets and liabilities that provide (use) cash:
Accounts receivable								23				23	60	16	(52)	(77)		(52)	(268)
Inventory												(152)		(151)	103	(152)		(152)	152
Prepaid expenses and other assets													(70)
Accounts payable, accrued expenses, and other liabilities								(441)				(106)	(796)	(570)	5,377	(3,129)		(2,645)	106
Deferred revenue								(29)				46	9	122	62	284		316	685
Net cash used in operating activities								(387)				564	(644)	160	404	(2,340)		(1,802)	(733)
Financing activities
Proceeds from public offerings, net of transaction costs																		(85)
Principal payments on long-term debt												(518)		(518)		(518)		(518)
Repayments of finance obligations								387				(46)	654	358	(404)	2,858		2,517	733
Net cash provided by financing activities								387				(564)	654	(160)	(404)	2,340		1,914	733
Effect of exchange rate changes on cash													(10)					(112)
Summary of non-cash activity
Recognition of right of use assets								(5,849)				2,000	(20,086)	(22,841)	(30,520)	(48,723)		(74,446)	(37,378)
Conversion of preferred stock to common stock															185
Other Adjustments
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) loss on extinguishment of debt																		(518)
Income tax benefit						$ (121)	$ (288)						(288)		(167)				(78)
Changes in operating assets and liabilities that provide (use) cash:
Net cash used in operating activities								$ (24)				312	$ 330	364	$ 226	600		906	$ 597
Financing activities
Net cash provided by financing activities												$ (518)		$ (518)		$ (518)		603
Effect of exchange rate changes on cash																		$ 112