Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 190,190	$ 93,765	$ 528,432	$ 252,745
Cost of revenue	166,805	108,855	428,610	282,839
Gross profit (loss)	23,385	(15,090)	99,822	(30,094)
Operating expenses
Research and development	27,021	12,374	56,165	35,965
Sales and marketing	21,476	6,561	37,992	23,069
General and administrative	40,999	13,652	71,346	40,856
Total operating expenses	89,496	32,587	165,503	99,890
Loss from operations	(66,111)	(47,677)	(65,681)	(129,984)
Interest expense	(17,376)	(26,946)	(62,645)	(73,031)
Interest expense to related parties	(1,443)	(1,953)	(5,378)	(5,785)
Other income (expense), net	762	(40)	692	93
Gain (loss) on revaluation of warrant liabilities and embedded derivatives	1,655	572	(21,576)	119
Net loss before income taxes	(82,513)	(76,044)	(154,588)	(208,588)
Income tax provision (benefit)	(3)	314	458	756
Net loss	(82,510)	(76,358)	(155,046)	(209,344)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(3,931)	(4,527)	(13,074)	(14,506)
Net loss attributable to Class A and Class B common stockholders	$ (78,579)	$ (71,831)	$ (141,972)	$ (194,838)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in dollars per share)	$ (0.97)	$ (6.97)	$ (4.13)	$ (19.06)
Weighted average shares used to compute net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in shares)	81,321	10,305	34,347	10,220
Product
Revenue	$ 125,690	$ 45,255	$ 355,651	$ 112,855
Cost of revenue	95,357	53,923	246,514	140,323
Installation
Revenue	29,690	14,978	70,053	41,625
Cost of revenue	40,118	14,696	87,655	42,996
Service
Revenue	20,751	19,511	60,633	56,977
Cost of revenue	22,651	30,058	66,164	69,585
Electricity
Revenue	14,059	14,021	42,095	41,288
Cost of revenue	$ 8,679	$ 10,178	$ 28,277	$ 29,935