Revenue Recognition - Cumulative Effect of Changes on Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended		9 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	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 213,543	$ 224,307	$ 200,326	$ 147,001	$ 157,145	$ 168,619	$ 138,302	$ 168,582	$ 347,327	$ 306,884	$ 571,634	$ 475,503	$ 785,177	$ 632,648	$ 365,623
Cost of revenue	188,595	181,582	171,976	145,437	150,224	141,209	111,318	124,147	317,413	235,465	498,995	376,674	687,590	526,898	381,934
Gross profit (loss)	24,948	42,725	28,350	1,564	6,921	27,410	26,984	44,435	29,914	71,419	72,639	98,829	97,587	105,750	(16,311)
Research and development	22,148	23,389	29,772	28,859	32,970	27,021	14,413	14,731	58,631	29,144	82,020	56,165	104,168	89,135	51,146
Sales and marketing	17,357	17,649	18,194	20,373	24,951	21,396	8,167	8,293	38,567	16,460	56,216	37,856	73,573	62,807	31,926
General and administrative	33,315	36,599	43,662	39,074	47,471	40,999	15,359	14,988	82,736	30,347	119,335	71,346	152,650	118,817	55,689
Total operating expenses	72,820	77,637	91,628	88,306	105,392	89,416	37,939	38,012	179,934	75,951	257,571	165,367	330,391	270,759	138,761
Loss from operations	(47,872)	(34,912)	(63,278)	(86,742)	(98,471)	(62,006)	(10,955)	6,423	(150,020)	(4,532)	(184,932)	(66,538)	(232,804)	(165,009)	(155,072)
Interest income	862	1,214	1,700	1,885	1,996	1,467	444	415	3,585	859	4,799	2,326	5,661	4,322	759
Interest expense	(21,635)	(21,323)	(22,722)	(21,800)	(21,757)	(22,125)	(27,147)	(25,992)	(44,522)	(53,139)	(65,845)	(75,264)	(87,480)	(97,021)	(112,039)
Interest expense to related parties	(1,933)	(1,605)	(1,606)	(1,612)	(1,628)	(1,966)	(2,672)	(2,627)	(3,218)	(5,299)	(4,823)	(7,265)	(6,756)	(8,893)	(12,265)
Other income (expense), net	138	525	(222)	265	636	(705)	(855)	(75)	43	(930)	568	(1,635)	706	(999)	(491)
Gain (loss) on revaluation of warrant liabilities and embedded derivatives	(540)	(540)	(540)	(540)	192	900	(19,197)	(4,034)	(1,080)	(23,231)	(1,620)	(22,331)	(2,160)	(22,139)	(15,284)
Loss before income taxes	(70,980)	(56,641)	(86,668)	(108,544)	(119,032)	(84,435)	(60,382)	(25,890)	(195,212)	(86,272)	(251,853)	(170,707)	(322,833)	(289,739)	(294,392)
Income tax provision	31	136	258	208	1,079	(3)	128	333	466	461	602	458	633	1,537	636
Net loss	(71,011)	(56,777)	(86,926)	(108,752)	(120,111)	(84,432)	(60,510)	(26,223)	(195,678)	(86,733)	(252,455)	(171,165)	(323,466)	(291,276)	(295,028)
Less: net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(5,178)	(5,027)	(5,015)	(3,832)	(4,662)	(3,930)	(4,512)	(4,632)	(8,847)	(9,144)	(13,874)	(13,074)	(19,052)	(17,736)	(18,666)
Net loss available to Class A and Class B common stockholders	(65,833)	(51,750)	(81,911)	(104,920)	(115,449)	(80,502)	(55,998)	(21,591)	(186,831)	(77,589)	(238,581)	(158,091)	(304,414)	(273,540)	(276,362)
Less: deemed dividend to noncontrolling interest	(2,454)	0	0	0	0	0	0	0					(2,454)	0	0
Net loss available to Class A and Class B common stockholders	$ (68,287)	$ (51,750)	$ (81,911)	$ (104,920)	$ (115,449)	$ (80,502)	$ (55,998)	$ (21,591)					$ (306,868)	$ (273,540)	$ (276,362)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in dollars per share)	$ (0.58)	$ (0.44)	$ (0.72)	$ (0.94)	$ (1.06)	$ (0.99)	$ (5.31)	$ (2.08)					$ (2.67)	$ (5.14)	$ (26.97)
Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		$ (14,023)	$ (11,417)	$ (730)					(12,147)		(26,170)
Cost of revenue		(2,459)	(1,475)	(1,215)					(2,690)		(5,149)
Gross profit (loss)		(11,564)	(9,942)	485					(9,457)		(21,021)
Research and development		0	0	0					0		0
Sales and marketing		(519)	(182)	(92)					(274)		(793)
General and administrative		0	0	0					0		0
Total operating expenses		(519)	(182)	(92)					(274)		(793)
Loss from operations		(11,045)	(9,760)	577					(9,183)		(20,228)
Interest income		0	0	0					0		0
Interest expense		0	0	0					0		0
Interest expense to related parties		0	0	0					0		0
Other income (expense), net		0	0	0					0		0
Gain (loss) on revaluation of warrant liabilities and embedded derivatives		0	0	0					0		0
Loss before income taxes		(11,045)	(9,760)	577					(9,183)		(20,228)
Income tax provision		0	0	0					0		0
Net loss		(11,045)	(9,760)	577					(9,183)		(20,228)
Less: net loss attributable to noncontrolling interests and redeemable noncontrolling interests		0	0	0					0		0
Net loss available to Class A and Class B common stockholders		(11,045)	(9,760)	577					(9,183)		(20,228)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue													$ (34,569)
Cost of revenue													(7,129)
Gross profit (loss)													(27,440)
Research and development													0
Sales and marketing													(1,400)
General and administrative													0
Total operating expenses													(1,400)
Loss from operations													(26,040)
Interest income													0
Interest expense													0
Interest expense to related parties													0
Other income (expense), net													0
Gain (loss) on revaluation of warrant liabilities and embedded derivatives													0
Loss before income taxes													(26,040)
Income tax provision													0
Net loss													(26,040)
Less: net loss attributable to noncontrolling interests and redeemable noncontrolling interests													0
Net loss available to Class A and Class B common stockholders													(26,040)
Less: deemed dividend to noncontrolling interest													0
Net loss available to Class A and Class B common stockholders													$ (26,040)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in dollars per share)													$ (0.23)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		238,330	211,743	147,731					359,474		597,804		$ 819,746
Cost of revenue		184,041	173,451	146,652					320,103		504,144		694,719
Gross profit (loss)		54,289	38,292	1,079					39,371		93,660		125,027
Research and development		23,389	29,772	28,859					58,631		82,020		104,168
Sales and marketing		18,168	18,376	20,465					38,841		57,009		74,973
General and administrative		36,599	43,662	39,074					82,736		119,335		152,650
Total operating expenses		78,156	91,810	88,398					180,208		258,364		331,791
Loss from operations		(23,867)	(53,518)	(87,319)					(140,837)		(164,704)		(206,764)
Interest income		1,214	1,700	1,885					3,585		4,799		5,661
Interest expense		(21,323)	(22,722)	(21,800)					(44,522)		(65,845)		(87,480)
Interest expense to related parties		(1,605)	(1,606)	(1,612)					(3,218)		(4,823)		(6,756)
Other income (expense), net		525	(222)	265					43		568		706
Gain (loss) on revaluation of warrant liabilities and embedded derivatives		(540)	(540)	(540)					(1,080)		(1,620)		(2,160)
Loss before income taxes		(45,596)	(76,908)	(109,121)					(186,029)		(231,625)		(296,793)
Income tax provision		136	258	208					466		602		633
Net loss		(45,732)	(77,166)	(109,329)					(186,495)		(232,227)		(297,426)
Less: net loss attributable to noncontrolling interests and redeemable noncontrolling interests		(5,027)	(5,015)	(3,832)					(8,847)		(13,874)		(19,052)
Net loss available to Class A and Class B common stockholders		(40,705)	(72,151)	(105,497)					(177,648)		(218,353)		(278,374)
Less: deemed dividend to noncontrolling interest													(2,454)
Net loss available to Class A and Class B common stockholders													$ (280,828)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in dollars per share)													$ (2.44)
Installation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 14,429	21,102	13,076	12,219	$ 11,066	$ 24,691	$ 19,643	$ 12,795	25,295	32,438	46,397	57,129	$ 60,826	$ 68,195	$ 57,937
Cost of revenue	16,901	26,141	17,685	15,760	20,651	35,506	29,951	9,198	33,445	39,149	59,586	74,655	76,487	95,306	54,970
Installation | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		2,552	1,691	1,156					2,847		5,399
Cost of revenue		0	0	0					0		0
Installation | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue													6,110
Cost of revenue													0
Installation | Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		18,550	11,385	11,063					22,448		40,998		54,716
Cost of revenue		26,141	17,685	15,760					33,445		59,586		76,487
Service
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	25,628	23,665	23,026	23,467	21,778	21,056	20,299	20,134	46,493	40,433	70,158	61,489	95,786	83,267	74,892
Cost of revenue	17,127	36,427	18,763	27,921	31,818	24,470	19,702	24,699	46,684	44,401	83,111	68,871	100,238	100,689	85,128
Service | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		847	(47)	751					704		1,551
Cost of revenue		(2,185)	(1,756)	(967)					(2,723)		(4,908)
Service | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue													3,842
Cost of revenue													(6,544)
Service | Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		22,818	23,073	22,716					45,789		68,607		91,944
Cost of revenue		38,612	20,519	28,888					49,407		88,019		106,782
Electricity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	15,059	15,638	20,143	20,389	20,364	20,439	19,863	19,882	40,532	39,745	56,170	60,184	71,229	80,548	75,602
Cost of revenue	12,785	27,317	22,300	12,984	11,601	12,180	12,062	13,785	35,284	25,847	62,601	38,027	75,386	49,628	49,475
Electricity | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		0	0	0					0		0
Cost of revenue		0	0	0					0		0
Electricity | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue													0
Cost of revenue													0
Electricity | Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		15,638	20,143	20,389					40,532		56,170		71,229
Cost of revenue		27,317	22,300	12,984					35,284		62,601		75,386
Product
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	158,427	163,902	144,081	90,926	103,937	102,433	78,497	115,771	235,007	194,268	398,909	296,701	557,336	400,638	157,192
Cost of revenue	$ 141,782	91,697	113,228	88,772	$ 86,154	$ 69,053	$ 49,603	$ 76,465	202,000	$ 126,068	293,697	$ 195,121	435,479	$ 281,275	$ 192,361
Product | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		(17,422)	(13,061)	(2,637)					(15,698)		(33,120)
Cost of revenue		(274)	281	(248)					33		(241)
Product | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue													(44,521)
Cost of revenue													(585)
Product | Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue		181,324	157,142	93,563					250,705		432,029		601,857
Cost of revenue		$ 91,971	$ 112,947	$ 89,020					$ 201,967		$ 293,938		$ 436,064