Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 233,471	$ 190,190	$ 667,960	$ 528,432
Cost of revenue	180,006	166,805	557,067	428,610
Gross profit	53,465	23,385	110,893	99,822
Operating expenses:
Research and development	23,389	27,021	82,020	56,165
Sales and marketing	18,125	21,476	56,947	37,992
General and administrative	36,599	40,999	119,335	71,346
Total operating expenses	78,113	89,496	258,302	165,503
Loss from operations	(24,648)	(66,111)	(147,409)	(65,681)
Interest income	1,214	1,467	4,799	2,326
Interest expense	(15,280)	(16,853)	(47,967)	(60,757)
Interest expense to related parties	(1,605)	(1,966)	(4,823)	(7,265)
Other income (expense), net	525	(705)	568	(1,635)
Gain (loss) on revaluation of warrant liabilities and embedded derivatives	0	1,655	0	(21,576)
Net loss before income taxes	(39,794)	(82,513)	(194,832)	(154,588)
Income tax provision (benefit)	136	(3)	602	458
Net loss	(39,930)	(82,510)	(195,434)	(155,046)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(5,027)	(3,931)	(13,874)	(13,074)
Net loss attributable to Class A and Class B common stockholders	$ (34,903)	$ (78,579)	$ (181,560)	$ (141,972)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in dollars per share)	$ (0.30)	$ (0.97)	$ (1.59)	$ (4.13)
Weighted average shares used to compute net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in shares)	116,330	81,321	113,948	34,347
Product
Revenue	$ 182,616	$ 125,690	$ 504,249	$ 355,651
Cost of revenue	94,056	95,357	350,008	246,514
Installation
Revenue	19,010	29,690	58,553	70,053
Cost of revenue	26,162	40,118	72,444	87,655
Service
Revenue	23,597	20,751	70,546	60,633
Cost of revenue	36,539	22,651	83,695	66,164
Electricity
Revenue	8,248	14,059	34,612	42,095
Cost of revenue	$ 23,249	$ 8,679	$ 50,920	$ 28,277